BE482829A - - Google Patents

Description

       

    <Desc / Clms Page number 1>
 



    It Phone system It
The present invention relates to telephone systems, and more particularly, to switching devices for interconnecting different species of equipment in these systems.



   The present invention relates to couplings which can be actuated automatically, with which is associated a common group of coupling control circuits which can be selected and adjusted and which can be entered with a view to temporary service, by the couplings, to choose different species of equipment under the direction of couplings or junctions of the office or other control devices and to connect the said different ones

  <Desc / Clms Page number 2>

 types of equipment at said junctions or for connecting this equipment to one another by junction conductors.



   It is therefore an object of the invention to simplify the operations required in a telephone office, to achieve savings in the operation of the telephone office apparatus and in the space required for the telephone equipment by providing a mechanism. universal switching device that can be automatically activated and available to connect the majority of telephone office actuation equipment to each other.



   A feature of the invention relates to a system in which a variable actuatable coupling and control circuit of the coupling respond automatically to different circuit connections with incoming and outgoing trunk circuits or auxiliary lines. in order to successively choose different species of equipment, the circuit connections in the junction circuit for sending signals to the coupling and to the coupling control circuit being modified in response to its kind of use.



   Another related feature relates to a system in which a coupling and a coupling control circuit automatically responds to different circuit connections with trunk circuits to select any kind of equipment from a number of different kinds. devices according to the established circuit connection and to connect the selected device to the signaling junction circuit.



   A related feature of the invention relates to a system in which a coupling and a coupling control circuit are arranged to successively choose different species of equipment responding to the signals.

  <Desc / Clms Page number 3>

 successive from a junction circuit and to successively associate the different equipment to the junction circuit.



   A related feature relates to a system in which a coupling is arranged to successively choose a coupling control circuit with a view to successively choosing different species of equipment for a calling terminating junction and a carrier junction chosen for. the same telephone connection.



   A related feature of the invention relates to a system in which a coupling has primary switches with corresponding contacts connected to a number of junctions and a number of choices of secondary coupling switches, the corresponding contacts of which are connected. to a number of different species of equipment, said coupling having access to a certain number of coupling control circuits which can be variably actuated to select free equipment and to actuate said switches primary and secondary, and said junctions comprising a device for directing the operation of the coupling and of the coupling control circuits in order to select particular species of equipment.



   Another related feature of the invention relates to a system in a telephone office for selecting voice amplifying repeaters as directed by a marker which has a record responding device providing the type of the incoming trunk. calling party and the type of outgoing trunk required for a telephone link and a second device responding to the activation of said first device to automatically determine whether a repeater is required for the telephone link in order to control the activation.

  <Desc / Clms Page number 4>

 start of a coupling with a view to selecting said repeater.



   A related feature of the invention is a system in which couplings which can be selected by junction circuits include switches connected to a number of different species of equipment and adjustable coupling control circuits which can be adjusted. be chosen by said couplings also, connected to said different species of equipment, said control circuits being adjustable as they are directed by the junction circuits to choose equipment of any particular species by trying a large number of such equipment and for actuating the coupling switches connected to it.



   These and other features will be discussed in more detail in the following description.



   Reference will be made to the accompanying drawings which illustrate the features of the invention and in which: FIGS. 1 and 7 illustrate an incoming and outgoing bilateral trunk inter-trunk circuit, FIG. 3 is an inter-urban junction circuit showing outgoing trunks and FIG. 2 automatic switches to interconnect the trunk circuits for a telephone connection; Figs. 8, 12 and 13 illustrate coupling switches and a coupling connector; Figs. 17, 18, 19, 22, 23 and 24 illustrate a coupling control circuit; Figs. 4, 5, 9, 10 and 11 illustrate an incoming recorder-sender; Figs. 15,16, 20 and 21 illustrate an outgoing or outgoing recorder-sender; Fig. 14 illustrates a voice amplifier repeater having a four-wire function;

   

  <Desc / Clms Page number 5>

 Fig. 6 illustrates in detail the apparatus of a marker for determining whether a repeater is necessary for a telephone link and schematically illustrates other apparatus which are associated with the apparatus controlling the repeater; Fig. 25 schematically illustrates the elements of the coupling and the coupling control system.



   The drawings illustrate, when arranged as shown in FIG. 26, the detailed structure of this coupling system.



   GENERAL DESCRIPTION --------------------
The general arrangement of circuits and equipment is shown schematically in Fig 25, in which a call from a remote trunk office 2501 energizes the apparatus of an incoming trunk trunk circuit 2502. The energizing the incoming junction circuit causes a 2510 coupling and 2540 coupling control circuit to be selected to associate an inbound sending register 2515 with the incoming junction by means of a primary switch 2511 and d a secondary switch 2512 of the coupling. The incoming recorder-sender is equipped with recorders which are set or adjusted by pulses emitted from the remote toll office 2501.

   These pulses can be used to position or adjust the call sign recorders of the input recorder-sender or where necessary pulses are transmitted to set both the call sign and digital recorders of that recorder-sender. . The energization of the incoming recorder-send associates a marker 2516 with it and causes the transfer of the call sign registers from the recorder-sender to this marker. In response to the excitement of the equi-

  <Desc / Clms Page number 6>

 Call sign registration device in the marker another equipment is actuated, to cause the selection of a free outgoing trunk to the desired remote office such as 2508. Outgoing trunks extending to this office are associated with call relays. terminal blocks shown schematically in 2517.

   The marker chooses a free outgoing junction and energizes switches 2503 through 2506, inclusive, to connect the incoming and outgoing junctions to each other. The selected free outgoing trunk is indicated by 2507. For calls requiring the transmission of digital digits, an outgoing sending recorder is chosen and the digital records from the incoming recorder-sending device are transmitted to a recorder-sending device. selected output such as 2518 or 2520. The outgoing junction energizes a circuit going to a coupling and a coupling control circuit, causing the selection of that output logger-sender, which after being chosen is connected by the primary and switches. secondary of the coupling circuit to the outgoing junction.



  The digital digits are transferred from the incoming recorder-sender 2515 through the contacts of the secondary switch at level n 2 via a bridge or vertical secondary and primary coupling switches by stage n 1 from the primary switch through the incoming junction 2502, the switches 2503, 2504, 2505 and 2506, the circuit from the outgoing junction 2507, level n 0 of the primary switch, through a bridge in the primary and secondary coupling switches to the loggers of the '2518 output recorder-sender.



  The digital recordings received by the output recorder-sender are transmitted to the remote office 2508 through a level of a secondary coupling switch, a bridge of the secondary and primary coupling switches, level 0 of the primary coupling switch

  <Desc / Clms Page number 7>

 re, through the outgoing junction conductors to the remote office.



   A voice amplifier repeater is required for high quality transmission when the incoming junction extending from the remote office 2501 to this long distance office and the outgoing junction extending from this long distance office to the remote office 2508 are long junctions. - gues. This requirement is automatically recorded by a category of trunk signals given to the marker for the inbound trunk and by the records from the calling remote office 2501 which provides direction for the choice of the outbound trunk. When these saves. The equipment which the repeater chooses in the outgoing junction is received by the marker and is actuated before the incoming recorder-sender and marker are disconnected from the coupling switches.

   For this purpose, the marker transmits a signal through the incoming recorder-sender and coupling switches to the incoming junction 2502, then through switches 2503 to 2506 inclusive, to the outgoing junction. This operation energizes a repeater selection relay in the outgoing trunk, which is automatically blocked for sender to wait for a recorder / output selection before indicating that a repeater is requested. This outgoing junction may have a single start conductor which is successively energized to first cause the selection of an outgoing recorder-sender and second to cause the selection of a repeater. In this case, the repeater and the output recorder-sender can both be engaged by the same primary coupling switch.

   The recorder-sender and repeater, can be engaged by the same secondary link switch or by separate secondary link switches as shown. In some examples, the load @

  <Desc / Clms Page number 8>

 There is sufficient traffic to justify a separate coupling switch chassis for the selection of repeaters. Coupling switch chassis 2510 would then include inbound logger-senders and associated outbound logger-senders and connect to different levels of secondary coupling switches or to different secondary coupling switches. Chassis 2530 would contain separate primary and secondary coupling switches for repeaters selection only.



   The inter-city interjunction 2502 illustrated in Figs. 1 and 7 is a bilateral trunk interjunction junction shown schematically at 2502 in FIG. 25. This trunk can be used either as an incoming trunk from the remote office shown in FIG. 1 or as an outgoing trunk to connect calls from this office to the remote office. In the system described herein this two-way trunk trunk circuit is employed only as an incoming trunk operating by means of signals transmitted by the associated remote office.

   The energization of this incoming junction establishes a turn-on circuit for a 2510 coupling and a 2540 coupling control system to associate an inbound recorder-sender and a marker with this inbound junction. start-up circuit establishes a circuit for the apparatus of Figs. 13 and 12, known as the mating connector and controlling the mating connector. This apparatus controls the selection of a free coupling control circuit 2540 illustrated in more detail in Figs. 17, 18, 19,22, 23, and 24.

   The multiple contact relays in the lower part of Fig. 12 are excited to associate the

  <Desc / Clms Page number 9>

 circuit route from free control circuit 2540 to a large number of inbound register-senders 2515 or 2536, as shown in Figs. 4, 5, 9, 10 and 11.



   The coupling control circuit, Figs. 17-19 and 22-24, inclusive, can be used to select an inbound recorder / sender, outbound recorder / sender, or repeater. The type of equipment to be chosen is controlled by the circuit of the inter-city trunk. For example, when the circuit of the bilateral inter-city junction, Fig. 1 and Fig. 7 is employed as the trunk inter-trunk at 30, a category signal is transmitted to control circuit 2540 indicating that a free inbound register-sender is required.



  The control circuit is then associated with a large number of incoming register-senders which are connected to certain levels of the secondary cross-bar switches 2512, 2513 or 2514 shown in more detail in the right part of the diagram. Fig. 8. Each control circuit 2540 may be connected to a different group of recorders-senders some of which are the same as those which are connected to other control circuits. Assuming that there are one hundred and fifty incoming register-senders and ten control circuits, the one hundred and fifty register-senders are distributed among the control circuits in any desired manner.

   It can be assumed, for example, that thirty recorder-senders can be tested simultaneously by the control circuit, which thirty recorder-senders are connected to thirty different levels of the secondary switches. However, provision is made for an arrangement intended to prevent testing register-senders that are busy. This busy state is indicated by an earth connected to the maintenance electromagnet of the

  <Desc / Clms Page number 10>

 mutators associated with busy recorders-senders.



   When a free recorder-sender is chosen, the appropriate switch level selection electromagnet is actuated and the appropriate bridge or vertical holding electromagnets both in the primary coupling switch in the left part of FIG. 8 and the secondary coupling switch in the right part of FIG. 8 are actuated. The inbound trunk trunks in FIG. 1 is thus connected, via the primary and secondary coupling switches, to the selected incoming recorder-sender. A signal is sent to the remote operator indicating that pulses can now be transmitted to tune the recorders of the recorder-sender.

   During this period the device of the incoming recorder-sender is prompted to choose a free marker. Different category signals are transmitted to the coupling control circuits to cause the selection of an outgoing recorder-sender or a repeater when the bilateral junction, Figs. 1 and 7, is used as an outgoing junction. The selection of outgoing or repeater recorder-senders; is done in the same way as the selection of an incoming recorder-sender by different classified channels.



   In the connection described, both the code and number pulses are transmitted to set the registers of the incoming recorder-sender to make an outgoing call which requires the transmission of digital digits. - code are transmitted from the arrival recorder-sender to the marker, to designate the type of the incoming call and the office or station with which to link them.

  <Desc / Clms Page number 11>

 sounds must be established. This determines the group of outbound trunks to try to choose an outbound trunk in the direction of the designated office. When the marker grabs a free junction, the crossbar switches in Fig. 2 are energized to connect the incoming junction to the chosen free outgoing junction.



  The free outgoing junction for the described link is shown in Fig. 3. This trunk is an outgoing trunk switching trunk extending to an office far enough away that the use of a repeater is necessary. The office also requires digital pulses to indicate the called subscriber pohte.



   As previously established, in the marker it is made up of circuits responding to the recordings and by the excitation of the equipment or the absence of excitation of the equipment, these establish the type of the incoming and outgoing junction. , so that the marker can automatically determine whether or not a voice amplifier repeater should or should not be inserted into the telephone line link. If a repeater is required, the circuit which is established by the marker extends through the inbound recorder-sender, the coupling switches of FIG. 8, the incoming trunk trunk, thence through the crossbar switches, to actuate the repeater relay in the outgoing trunk.

   This repeater relay is blocked to prepare for selection of a repeater circuit after selection of an outgoing recorder-sender. The repeater selection is therefore under the automatic control of the marker and the signal for this repeater selection is given immediately after the selection of a free outgoing trunk and the energization of the switches of FIG. 2 so

  <Desc / Clms Page number 12>

 that the switch can be released at the earliest. The voice amplifying repeaters which are inserted into the speech conductors of the outgoing junction are described in Fig. 14.

   This repeater circuit is arranged for a four-wire trunk system having both one-way / two-wire transmission through a unidirectional repeater such as 411 in one direction and a second two-wire channel. and a unidirectional repeater such as 412 in the opposite direction. These voice amplifying repeaters may be of any type well known in the art. The artificial equilibrium line circuits or attenuators are also mounted in Fig. 14 for use as required with repeaters depending on the junction with which they are associated. This repeater circuit will be described in more detail in the detailed description.



   The outgoing junction Fig. 3 energizes a circuit to establish the connection with an outgoing recorder-sender. This circuit excites the apparatus of FIG. 13 to connect the outgoing junction to a coupling control circuit, as shown in Figs. 17, 18, 19, 22, 23 and 24. In this example, the apparatus shown in FIG. 13 may be the same as that operated by the incoming junction or may be a different circuit. The control circuit, Figs. 17 to 19, Figs.



  22 to 24, inclusive, may be the same as that employed by the incoming trunk or other coupling control circuit in this common group of control circuits. When the coupling control circuit is associated with the outgoing junction, a signal circuit is established, which causes the 2540 coupling control circuit to try a number of output sending registers, such as recorders.

  <Desc / Clms Page number 13>

 senders 2518, 2520, and 2537 to find a free outgoing logger-sender. The tried out logger-senders are associated with a particular set of secondary link switch levels such as 2512,2513, and 2514, the same as described for the inbound logger-senders.



   When a free output logger-sender is found, the appropriate selection electromagnets and holding electromagnets of the primary coupling switch 2511 and the secondary coupling switch 2512, 2513 or 2514 are actuated. This excitation associates an output recorder-sender with an outgoing junction of FIG. 3, and since the incoming trunk is connected to an incoming recorder-sender, circuits are established at this time to connect the incoming recorder-sender to the outbound recorder-sender.

   The incoming recorder-sender circuits are connected by a stage and a horizontal of a secondary switch and a stage and a horizontal of the primary switch shown in Fig. 8, via the circuit paths of the incoming junction circuits of FIGS. 1 and 7, by the cross-bar switches of FIG. 2, the outlet junction of FIG. 3, thence by a different level and a different horizontal of a primary and secondary switch, Fig. 8, to the output recorder-sender. A signal is given from the output recorder-sender to the incoming recorder-sender, indicating that the link has been established and digital pulses are immediately transmitted to tune the recorders of the output recorder-sender .



   This action usually terminates the services of the incoming recorder-sender, and at this point, this recorder-sender can be released, which de-energizes the holding electromagnets of the switches, Fig. 8,

  <Desc / Clms Page number 14>

 that associated the incoming recorder-sender with the incoming trunk trunk.



   The trunk inter-trunk junctions are arranged for successive operations for the selection of an outgoing recorder-sender and a repeater, if required. After the transmission of the pulses, a relay in the outgoing junction circuit is de-energized, which establishes a second circuit on the outgoing junction start conductor, to obtain the services of a coupling again. and a coupling control circuit for choosing a free repeater and associating this repeater with the connection of the line. The switch-on circuit energizes the device as shown in FIG. 13, as previously described, which causes the selection of a free control circuit, Figs. 17 to 19, 22 to 24 inclusive.

   A signal is transmitted from the outgoing junction to this control circuit, which prepares the control circuit for selection of a repeater. The difference in the category signals is established by the successive rearrangement of the device in the outgoing junction to successively cause the selection of the outgoing recorder-sender and later of a repeater. A number of repeater circuits are tried in order to find a free repeater in the same manner as described above. The repeaters are connected to particular stages on secondary switches, Fig. 8, which are the same repeaters as those tested by the control circuits.

   When a free repeater is found, a stage and a secondary bridge or vertical are connected to each other by energizing a selector electromagnet and a holding electromagnet. The electromagnets of

  <Desc / Clms Page number 15>

 selection for the primary switch, Fig. 8, and the secondary switch, Fig. 8, are actuated separately, but the holding electromagnets are actuated by a common circuit. When a free repeater has been found, the outgoing junction circuit apparatus is energized to extend the talk leads through that free repeater. After the insertion of this repeater, the connection of the line is completed and the conversation can begin.



   DETAILED DESCRIPTION ---------------------
The following detailed description describes the interconnection of an incoming trunk line or trunk from a remote trunk office 100 through the two lanes of a four-wire system through an outgoing trunk extending to Telephone office 330 which is reached by means of a trunk long enough to require a voice amplifier repeater in each channel for the transmission of the conversation. As stated previously, different types of trunk trunk are employed in the described circuit arriving at other trunk offices and offices located in the network of the trunk office described as well as originating from these two kinds of offices.

   These trunk trunks are connected to trunk offices employing circuit calling equipment, automatic equipment, or manually operated equipment. The circuit arrangement and apparatus described is intended to receive a call from an automatic office in which a signal is originally transmitted from a remote office, pulses then being transmitted to tune the recorders in the system. equipment described, which activates an interurban office with automatic switching according to the character and the number of impulses transmitted. Interjunction junctions

  <Desc / Clms Page number 16>

 interurban, as for example shown in Figs. 1 and 7 or in Fig.

   3, can be unilateral junctions or bilateral junctions. A one-sided incoming trunk cannot be used as an outgoing trunk.



  A bilateral junction as shown in Figs. 1 and 7 can be used as an incoming junction or as an outgoing junction. In this description the trunk circuit (Figs. 1 and 7) is employed as an incoming trunk brought into service in response to an incoming call from the remote toll office 100, but the peculiarities of the two-way trunk are incorporated to describe its trunk. In association with the coupling switches of FIG. 8, with a view to demonstrating its adaptability in the choice of an incoming recorder-sender, an output recorder-sender, or a repeater via the same switching arrangement.



   A call from the remote long distance office 100 is initiated by transmitting a given signal to the incoming long distance trunk @@ trunk circuit which enters the office through line conductor 113 and is extended by conductor 120 to do so. operate relays 704 and 719. This signal can enter the office through a simplex signaling circuit (not shown) in order to place an earth on conductor 120 which extends through contact 9 of relay 722, contact 7 of relay 716, contact 1 of relay 709, thence through the winding of relay 719 to the battery. One branch of this circuit extends through contact 3 of relay 709, the winding of relay 704 to the battery, actuating both relays 704 and 719.

   When energized, relay 704 disconnects the earth from conductor 121 and connects the battery through lamp 702 to this conductor. This can be extended by a simplex signaling circuit (not shown) on the line as a signal on conductor 112 to the

  <Desc / Clms Page number 17>

 office 100 for monitoring purposes and to prevent the apparatus of office 100 from transmitting dial pulses before an inbound register-sender has been selected and is ready to receive the dial pulses.

     Leelais 719 connects through its contact 7 the category conductor 755 of the category conductor
753 to prepare a category indication to direct the operation of the coupling circuit, which will be described later, so that this coupling circuit chooses an inbound register-sender. Relay
719 also actuates relays 706 and 107. The circuit for relay 706 is obvious and should not be described.



   The circuit for relay 107 is also evident since it extends directly to the voltage applied to the contact.
6 of relay 706. Relay 716 is actuated by contact
3 of relay 719. The above relays are actuated to open the shorting paths for relay 104 extending to the talking leads which will later allow the marker access to the control circuits on those leads. Relay 107 also provides a ground from contact 5 to contact 12 of split relay 104, conductor 204 for later use to maintain and complete switching connections, and connects the battery through the coil of relay 104 to conductor 125 of the switch. coupling circuit.

   Relay 719 is now connected directly to conductor 120, extending this signaling circuit path independent of relays 716 and
709 which are activated later. This circuit includes: the battery, coil of relay 719, contact 3 of relay 706, contact 9 of relay 722, conductor 720, and earth in the remote office on the signaling path. When energized, relay 716 establishes a blocking circuit for itself by its contact 4. The re-

  <Desc / Clms Page number 18>

 Loosely of this relay is now under the control of ion tube 712 and the ion tube coupling circuit.



  Relay 716 also establishes blocking circuits for relays 706 and 107 and provides a ground on conductor 750 which will later be used by the marker and to establish occupancy of that circuit for other markers. This circuit comprises: earth associated with contact 6 of relay 722, contact 5 of relay 716, contact 4 of relay 709, contact 2 of relay 710, then relay 750 functioning as occupant earth for all markers. This is necessary in such a junction, since markers can at any time try this junction to use it as an out junction.

   The above operations necessarily precede the excitation of a coupling circuit which now takes place, from the earth applied to contact 6 of relay 716 by contact 5 of relay 719, conductor 751, contact 2 of relay. relay 1310, the winding of the start relay 1311, to the battery.



   With this energized, relay 1311 establishes circuits to together energize a connector to control this connection for the purpose of associating the incoming junction with a coupling control circuit shown in Figs. 17, 18, 19,22, 23 and 24, inclusive.



   The control circuit shown in the last figures is employed for the selection and energization of a combination of coupling switches shown in FIG. 8 to connect an incoming trunk to an incoming recorder-sender, or, when this same trunk is used as a two-way join, the switches are chosen to connect the trunk to an outgoing recorder-sender or to a repeater. The control circuit can be used successively by a functional junction circuit.

  <Desc / Clms Page number 19>

 nant as an incoming junction and later through the same junction functioning as an outgoing junction.

   This makes it possible to employ a common group of these control circuits for use with any type of circuit entering the office or any type of circuit employed to establish links to an office. departure. The crossbar switches of the coupling described in Fig. 8 show the switches used to establish different connections between junctions and recorder-senders or repeaters circuits. Switch contacts 800 to 806 inclusive, include part of a primary coupling switch. Each switch of this kind ordinarily has ten distinct levels, two of which are shown and a large number of bridges or vertices, three of which are shown.

   In this example, the incoming junction is connected to the lower bridge and the switch is arranged to connect this incoming junction to a secondary switch by the excitation of the selection electromagnet 807 and of the holding electromagnet 810.



  In practice, this incoming trunk can be associated with various secondary switches by a number of different bridges on that switch, constituting a large number of device choices for extending a call from the incoming trunk to the switchgear in the office. tion. Other bridges can be actuated by the holding electromagnets to associate this junction with an outgoing recorder-sender or a repeater, if the junction is used as an outgoing junction.

   This arrangement of associating the apparatus of a bilateral junction with the apparatus of the telephone office will be clearly understood from a later explanation of the association of the connections established between the telephone.

  <Desc / Clms Page number 20>

 outgoing junction (Fig. 3) by this switch with an outgoing recorder-sender and a repeater. Secondary bridges 820, 823 and 826 can be on a single crossbar switch or on separate crossbar switches, depending on which connection is best suited to this eas.

   The secondary switch points shown can therefore be considered to be on one stage of any bridge on a single cross-bar switch or on one stage of any bridge on any one of a large one. number of crossbar switches.



   The multi-contact relay 1314, the multi-contact relay 1206 and the relays shown in the upper part of Fig. 12 constituting an arrangement for giving an incoming junction several choices for obtaining the services of a coupling control circuit which can be associated therewith by the energization of the multiple contact relay 1207 which must appear free on test before being seized. There are a number of relays 1314 for each group of incoming trunks. This set of relays is connected to a number of relays 1206 which are interconnected when banded together as shown.

   There are a number of relays 1207 for each connector extending between the contacts of relays 1314 and the contacts of relay 1207. Each control circuit has a representative relay in each connector, so any one of the circuits exists. can be associated, when it is free, with one of the connectors between the junction groups and the control circuits.



   The energization of the start-up relay 1311 by

  <Desc / Clms Page number 21>

 a circuit established in the incoming junction described above initiates the selection of a free control circuit. A circuit is first established comprising, the battery, resistor 1313, contact 1 of relay 1311, contact 3 of relay 1315, contact of relay 1316, the winding of relay 1201, contact 1 of relay earth 1202 and the / '. It energizes a chain of similar relays intended to prevent the commissioning of a connector through more than one junction. On energizing, relay 1201 grabs a free connector and makes that connector occupied for other trunk circuits until it has completed its function of choosing a crossbar switch connection. free.

   A circuit is also established from ground through contact 2 of relay 1311, to be used when multiple contact relays 1206 and 1207 have been energized. A third circuit is established by the contact 3 to energize the counting relay 1317 which associates the counting switch with a counting circuit 1340 with a view to releasing a faulty control circuit. This is shown schematically and can operate in the same way as many count circuits. On energizing, relay 1201 establishes a circuit for relay 1205 comprising earth, the winding of this relay, contact 3 of relay 1201, resistor 1204 and the battery. Relay 1205 establishes an obvious circuit through its contact 1 and contact 2 to energize the electromagnet 1206 which controls the armatures of the multiple contact relay.

   On energizing, relay 1206 establishes a circuit passing through its contact 1 to relay 1208 which establishes circuits through the apparatus shown in the left part of FIG. 12 to associate the connector with a free control circuit. For this purpose, it is first

  <Desc / Clms Page number 22>

 bli a circuit from relay 1201 which is assumed to be in the chain control circuit. This circuit comprises: the battery, resistor 1203, contact 4 of relay 1201 and the winding of relays 1209, 1210 or 1211, depending on whether one or the other of these relays is associated with a free control circuit. It will be seen that this circuit is extended by contact 1 of relays 1212, 1213 or 1214 which represent three relays of a large number of relays in a chain equivalent to the number of control circuits employed.

   If relay 1212 is normal, the circuit extends through the winding of relay 1209, contact 2 of relay 1210 to ground applied to contact 2 of relay 1211. When energized, relay 1212 shows that the associated control circuit has been taken to be used through another connector and the circuit from the battery to contact 4 of relay 1201 then extends through contact 1 of relay 1212, contact 1 of relay relay 1213 normal, the winding of relay 1210 to earth applied to contact 2 of relay 1211 to obtain the services of another control circuit. In this example, it can be assumed that relay 1212 is normal and the circuit is extended by winding relay 1209 to ground, energizing relay 1209.

   This establishes an obvious circuit for energizing multiple contact relay 1207 to associate a control circuit with the incoming junction apparatus. On energizing, relay 1207 establishes a circuit for control circuit occupancy relay 1701 comprising: the battery, its winding, conductor 1221, contact 4 of relay 1207 and earth. When energized, the occupancy relay 1701 associates the earth with a certain number of conductors equivalent to the number of relays used in the

  <Desc / Clms Page number 23>

 chain circuit of the upper left of Fig. 12. (In this figure, the WCR indication shows that the conductors included in the corresponding brace go to the windings of other connector relays.

   Likewise the conductors under CCR go to the contacts of other connector relays). These earth circuits extend through the upper windings of all relays 1212, 1213 and 1214 which all energize except for the one associated with the control circuit employed. The energization of relay 1212 associated with the control circuit employed is prevented by a shunt circuit extending from contact 1 of relay 1207 at a point of connection of resistor 1216 to the coil of relay 1212, thus bypassing the connection of the relay. coil of this relay and keeping it normal. The control circuit taken to be used is therefore not available for other connectors. It can therefore be assumed that the control circuit (Fig.



  17, 18, 19,22, 23 and 24) is prepared for operation by trying the crossbar switches to establish the connection between the incoming trunk and an incoming register-sender.



   The organization of the switching arrangement of the coupling and of the control circuits is such that a choice is made between a large number of recorder-senders or repeaters associated with the control circuit equipment. In certain cases, a certain number of recorder-senders or free repeaters are simultaneously associated with the control circuit and only one of these is chosen.

   This selection is effected by sending to the control circuit a signal indicating which stage of a particular secondary coupling switch is connected to a recorder-sender or to

  <Desc / Clms Page number 24>

 a preferred free repeater. is
The arrangement / essentially as follows: A category signal is transmitted to the control circuit for the selection of an inbound recorder-sender, outbound recorder-sender or a repeater, which operates a combination of Category relay to direct the control circuit. In the control circuit, the relays 2201, 2203 and 2205 are each associated with a different combination of switches comprising a bridge on a primary switch and a bridge on a secondary switch each having several levels.

   A number of bridges on the primary switch are connected to bridges on a number of secondary coupling switches. The bridges of the secondary coupling switches are associated with a number of levels, each of which is connected to a different sending recorder or repeater. The bridge holding solenoid on a primary coupling switch and the bridge holding solenoid on a secondary coupling switch are multiple so that they can be actuated simultaneously. Each relay, such as 2201, has as many contacts, such as 3 and 4, as there are levels on a secondary coupling switch connected to loggers-senders or repeaters to be tested.

   There are as many relays such as 2202 as there are secondary link switch levels in a switching combination connected to loggers or repeaters to be tested. All of these relays, such as 2202 can be actuated by the contacts on each relay such as 2201. In consideration of the above for energizing any particular relay 2202, 2204 or 2206, of which there are a large number, indicates the association of the control circuit with a free recorder-sender on a particular level of a

  <Desc / Clms Page number 25>

 secondary coupling switch of a particular switching combination. Relays 1805, 1809 and 1810, are actuated according to the switch level on which the recorder-sender or the free repeater is found.

   There are therefore as many of these relays as there are levels on any secondary coupling switch. The relays 1320,1321, 1322,1323 and 1324 are also activated according to the level on which the registrar-sender or the free repeater is found.



  There are as many of these relays as there are levels on any secondary switch. Relays 1330, 1331 and 1332 are actuated according to the category indication transmitted to the coupling control circuit. The contacts of relay 1330 are connected to a large number of outgoing recorders-senders, the contacts of relay 1331 are connected to a large number of inbound recorders-senders, and the contacts of relay 1332 are connected to a large number of repeaters. It will be appreciated that there is a direct circuit between the coupling control circuit and the recorders-senders or repeaters through the contacts of these relays, which is intended for testing purposes to determine if the records. senders or repeaters are free or busy.



  Any free recorder-senders or repeaters that are found can be connected to an equivalent number of relays 2202,2204 and 2206 and actuate all these relays. There is a chain circuit passing through these latter relays, so that a particular free recorder or repeater can be chosen. This chain circuit arrangement may be different in each control circuit to which the same recorder-senders or repeaters are connected, so that different recorder-senders or repeaters are constantly chosen for use.

   The circuit layout is

  <Desc / Clms Page number 26>

 such that if a free register-sender is indicated to the control circuit and this free register-sender is instantly seized by another control circuit, a / busy indication is immediately transmitted to the coupling control circuit, so that the following free recorder-sender, connected to a relay in the chain circuit, can be chosen.

   After a particular recorder-sender or repeater has been indicated to the control circuit as free, one of relays 1320 to 1324 is actuated depending on the level on which the recorder-sender or second free repeater is found and a / a test of that recorder-sender or repeater is done and, if satisfactory, the recorder-sender or repeater is entered for use.

   The combination of circuits and the equipment as described for the control circuit is such that signals have been transmitted indicating the level of a particular secondary switch to which this recorder-sender is connected, and that a circuit is immediately established to actuate the selection electromagnets of the primary and secondary switches corresponding to these levels, and that the circuit is also established to energize the / bridge holding electromagnet in the primary and bridge switch in the secondary switch corresponding to this switch combination. In this way, a particular free register-sender or repeater is chosen from a large group and connected to an incoming or outgoing trunk circuit.



   When energized, relay 1207 connects a large number of conductors between the coupling control circuit and other office devices, and earth is connected by three conductors 1220, 1221 and 1222 (note that LCC indicates conductors going to other coupling control circuits). An obvious circuit is

  <Desc / Clms Page number 27>

 set on conductor 1220 to energize relay 1902. The circuit on conductor 1221 energizes relay 1701. The circuit set on conductor 1222 establishes a blocking circuit for relay 1703 which is used after this relay has been energized as explained later. On energizing, relay 1701 closes a circuit to energize relays 1213 and 1214 to indicate that this control circuit is busy for all other connectors as explained previously.

   On energizing, relay 1902 establishes an obvious circuit for relay 2404 and a drive circuit for relay 1709 including: battery, resistor 1912, contact 4 of relay 1902, contact 5 of relay 1903 , contact 3 of relay 1809, contact 4 of relay 1910, the winding of relay 1709, contact of relay 1801 and earth.



  Relay 1709 locks to earth applied to its contact 3. This control circuit has now been actuated to control the selection of available devices to establish a connection between the circuit of the calling terminating trunk. , Fig. 1 and 7, and an inbound register-sender not available under the control of the inbound trunk circuit.



   A group of couplings and coupling control circuits serves several groups of junctions which may be referred to as subgroups of junctions within a larger group. When a particular junction in a junction subgroup operates a coupling circuit, it is necessary to identify the subgroup with which it is associated. The coupling control circuit is therefore provided with a number of relays 2214 to 2212 equivalent to the number of subgroups of junctions served by the contacts of the associated connector relays. In this example it can be

  <Desc / Clms Page number 28>

 assumed that a circuit is established for group relay 2214, to show the subgroup of junctions requiring service.

   This circuit consists of the battery, the coil of relay 2214, the contact 1 of the relay 2305, the conductor 1249, the contact of the multiple contact relay 1207, the corresponding contact 29 of the relay 1206, the contact 2 of the relay. 1311 and the earth. When energized, relay 2214 is blocked by - contact 2 to conductor 1249. Note that the blocking circuit does not extend through the contact of relay 2305. -A circuit is now established for the relay 2213, extending from the battery by its winding, contact 1 of relay 2214 to blocking earth for relay 2214.

   Relay 2213 establishes by energizing an obvious circuit for relay 2305 which locks to earth, on relay 2214. -one energizing, relay 2305 opens excitation circuit for relays 2214 to 2212 and relay 2214 remains energized on its holding circuit. A circuit is therefore established for the multiple contact relay 1314 comprising: the earth, the winding of this relay, the contact 27 of the multiple contact relay 2206, a corresponding contact on the relay 2207, the conductor 1247, the contact 4 of relay 2214, contact 1 of relay 2213, resistor 2216, contact 2 of relay 1704, contact 4 of relay 2305 and the battery. There are several junctions in each sub-group, which are served by the same relay, the start-up 1311. These are represented in the control circuit by the relays 1706 to 1710.

   It will be remembered that a start-up earth was placed on the conductor 751 of the incoming junction by the energization of the start-up relay 106. This earth originally energized the start-up relay 1311, but at the same time. time extends the earth through all contacts in multiple on relay 1310 associated with the sub-group. These conductors extend through an equivalent number of contacts

  <Desc / Clms Page number 29>

 on relay 1314 represented by contacts 8 and of this relay. The circuit also extends through contact
15 of relay 1314 to energize relay 1705 in the control circuit. The trunks subgroup 1706 through 1710 relays representing all trunks in the group are also energized.

   Relay 1705 is energized on conductor 1236 which extends through the contact of multiple contact relays 1207 and 1206 to ground in the circuit of the incoming junction through the contact
15 of relay 1314. The circuits for relays 1706 to 1710 include: the battery, their windings, contacts 3 and 4 of relay 1711, conductors 1229 and
1230 extending through the contacts of multiple contact relays 1207 and 1209 to contacts 7 and 8 of the relay
1314, contacts 1 and 2 of relay 1310 to ground applied to the start conductor 751. All relays 1706 to 1710 now energize and lock on their associated excitation circuits regardless of the contacts on the switch. relay 1711.

   Relay 1703 is now energized from the battery by winding it on a series circuit by contact 1 of relays 1710 to 1706, contact of relay 1705, contact 5 of relay 1710 to earth applied to conductor 1229 On energizing, relay 1703 establishes a circuit for relays 1702 and 1310 comprising: the battery, relay contact 2 of relay 1703, the winding of relay 1702, conductor 1223, contacts of relays 1207 and 1206. , relay contact 2
1314, the winding of relay 1310 and earth. By energizing, relay 1310 individualizes the earth circuit of the incoming junction so that only one relay of the series of relays 1706 to 1710, remains energized, this earth being extended from conductor 751 to contact 8 relay
1314, to conductor 1229 which blocks relay 1710 in

  <Desc / Clms Page number 30>

 his position.

   All other relays drop, since their blocking circuits are open. It is therefore established that the junction associated with relay 1710 is the terminating calling junction with which a register-sender is to be associated. This establishes the level of the primary switch to which the incoming trunk is connected. While operating, relay 1310 also opens the control circuit for relay 1705 which now drops out and establishes a circuit for relay 1707.



  This circuit includes: the battery, the winding of this relay, the contact 4 of the relay 1703, the contact of the relay 1705, the blocking circuit of the relay 1710 and the earth. Relay 1707 establishes an obvious control circuit for relay 1711, through its contact 2 and also partially establishes a control circuit for relay 2304 which will be completed later.



   Since the control circuit is used to select either an inbound recorder-sender, outbound recorder-sender, or a repeater, it is necessary that a category signal be transmitted from the junction circuit to indicate the type of equipment to choose. In the description of the incoming junction, when the call was made, the relay 719 established by operating the category of circuit to be connected with this incoming junction by the association of the conductor 753 to the conductor 755 which now actuates a relay of. category in the control circuit which in this example is the category 1806 relay.

   The circuit for this relay includes: the battery, the winding of this relay, the conductor 1234, the contacts of the multiple contact relays 1207 and 1206, the contact 13 of the relay 1314, the conductor 753, the contacts of the relay 719, the conductor 755, contact 10 of relay 1314,

  <Desc / Clms Page number 31>

 the contacts of multiple contact relays 1206 and 1207, conductor 1231, contact 7 of relay 1710, contact 2 of relay 1711, contact 2 of relay 2303 and ground. This activates relay 1806 and indicates to the control circuit that an incoming recorder-sender will be connected to the incoming junction. In the circuit drawn for the category conductor, it will be noted that each junction has an individual category conductor passing through the contacts of windings 1706 and 1710 to the control circuit of the category relay.

   These individual conductors coming from the junction circuit can be used simultaneously by different junctions if they are associated with different control circuits in the common group of control circuits. Other category relays in control circuit will be explained later, for example, relay 1804, is another category relay which, when actuated by an outgoing trunk circuit indicates that a recorder- outgoing sender will be registered there. Relay 1210 is also a category relay and when actuated indicates that a repeater will be associated with the junction circuit which may be a bilateral junction or a unilateral junction extending to a called station.

   A large number of conductors are now connected between the control circuit and an equivalent number of inbound recorders-senders so that these recorders can be tested to find a free recorder-sender that can be associated. at the incoming junction. This connection is established by the operation of relay 1331 to which the test leads of these numerous recorder-senders are connected, and which extends these test leads from the recorder-senders to the control circuit.

   The control circuit for this relay includes, earth, relay winding

  <Desc / Clms Page number 32>

 1331, contact 17 of relay 1314, contacts of multiple contact relays 1206 and 1207, conductor 1238, contact 5 of relay 1709, contact 2 of category relay 2210 which is normal, contact 2 of category relay 1806 which is activated, contact 1 of relay of category 1804 which is normal, contact 4 of relay 2304, contact '9 of relay 2402 and the battery.



   As stated previously, a large number of recorder-senders are simultaneously associated with the coupling control circuit, in order to be tested. The control circuits of these logger-senders are connected to a number of switch levels on a number of secondary coupling switches. Each secondary coupling switch is associated with a different bridge from the same primary coupling switch connected to the calling incoming trunk. This makes a large number of recorder-senders available to an incoming call, so that if a number of the recorder-senders are busy, one can be found that is free.

   Usually there is more than one recorder-sender available which is free, but the first free of those of the choice is entered. sound of the secondary and primary switches in the couplings is such that the sustaining electromagnets controlling the bridges on the primary switch are connected to the sustaining electromagnets of the bridge on a secondary switch and that all incoming recorder-senders connected at the levels of these secondary switches are available to be connected to the incoming junction, if they are free. The inbound loggers-senders to be tested can be connected to any number of levels in these secondary bridges and can be connected to all of these.

  <Desc / Clms Page number 33>

 levels.

   Some bridges of the secondary switch may have associated inbound register-senders at different levels, outbound register-senders associated with other levels, and repeaters associated with still other levels. The aforementioned bridges and levels of switches are available for other coupling control circuits and, therefore, when an attempt is made to obtain the services of a free register-sender, it is necessary to should be checked to determine which couplings are available for testing, that is, which couplings have not been taken for use by other control circuits.

   When a coupling has been taken for use by another control circuit, earth will have been applied to the holding electromagnet winding to actuate the holding electromagnet of the primary and secondary switches. . The conductors coming from all the holding electromagnets range from or range switches through contacts, such as 3, 4 and 5, from relay 1314 and similar contacts from multiple contact relays 1206 and 1207 to conductors such as 1224, 1225 and 1226. In each case, there are as many conductors of this kind as there are couplings available which can be used to choose recorder-senders or repeaters and these conductors coming from all these holding electromagnets. : have through the contacts of relay 2306 to the left windings of relays such as 2201,2203 and 2205.

   If earth is associated with the holding electromagnets of some bridges, any one, a circuit for these occupied couplings establishes an operating path for the aforementioned relays 2201, 2203 and 2205 in order to prevent the loggers associated with the switches busy secondaries are not attempted. When operating, any of these relays

  <Desc / Clms Page number 34>

 opens the control circuit for relays such as 2202, 2204 and 2206. There are / of these latter relays as there are recorders available, but only the; recorders-senders associated with non-actuated relays 2201, 220.3 and 2205 are tested.

   If it is assumed that the relays 2201, 2203 and 2205 have remained normal, all the relays such as 2202, 2204 and 2206, are associated with an operating path extending on the test circuit to the recorders-senders of 'arrival. One of these circuits includes: the battery, the left winding of relay 2206, contact of relay 2205, conductor 1260, contact of relay 1207, contact 40 of relay 1206, contact 2 of relay 1331 and the busy test driver of an arrival recorder-sender. It will be recalled that relay 1331 was energized by a circuit established by the category relay 1806 of the control circuit, indicating that the incoming register-senders are the ones to be tested.



  If all relays 2201, 2203, 2205 and other similar relays remain normal, a large number of loggers-senders are tried. If, however, all relays such as 2201, 2203 and 2205 are actuated indicating that all available paths are occupied, only one is connected from contact 1 of relay 1903, by a chain circuit via contacts 2 to actuate a coupling circuit under the control of relays 1906 and 1907.



  This earth extends through contact 2 of relay 2205, contact 6 of relay 2406, contact 1 of relay 2402, contact 15 of relay 2307 to the armature of switch 1911. When operating,, relays 1906 and 1907 will eventually establish a circuit to return the control circuit to idle in a manner which will be described later, if a free coupling does not become available within a given period of time. Circuits for relays 2204 and

  <Desc / Clms Page number 35>

 
2202 as well. that similar relays are established to routes passing through circuits such as those described for relay 2206 using the conductor
1261 or 1262 or similar conductors extending through other contacts from relay 1331 to the incoming register-senders.

   Since only one incoming recorder-sender is depicted in this drawing, only one test lead goes through contact 2 of relay 1331 to that recorder-sender. @and recorder-sender is shown in figures 15, 16, 18, 19 and 20. The conductor coming from contact 2 of relay 1331 is connected to contact 1 of relay
918. When this recorder-sender is employed, relay 918 is actuated and, therefore, a busy recorder-sender is indicated by an open circuit and a free recorder-sender is indicated by an associated earth. conductor connected to the contacts of relay 1331.



   If there are a certain number of free recorder-senders associated by the contacts of relay 1331, a circuit is established for an equivalent number of relays 2202, 2204,
2206. The circuit for relay 2206 passed through the contact of relay 1331 and from there extends to the ground applied to contact 1 of relay 918. Since there may be a number of free circuits available, it is now necessary to choose one of these free recorders-senders. Operation of any one of the relays 2202, 2204 or 2206 establishes a circuit comprising: earth, contact 3, the coil of relay 2307 and the battery. By operating this relay establishes a circuit for relay 2406 comprising: the battery, the winding of this relay, contact 10 of relay 2402, contact
4 of relay 2307 and earth.

   When operating, the relay
2307 also establishes a circuit comprising: earth, contact 2 of this relay, the winding of relay 1802 and the battery which activates the latter. It is also

  <Desc / Clms Page number 36>

 A circuit is established through contact 1 of relay 2307 to actuate relay 2207.



   When a free inbound register-sender has been found, relay 2406 is actuated as previously described, which establishes circuits to actuate all relays 2201, 2203 and 2205, as well as other such relays. This establishes a circuit for relay 2211 comprising: the battery, the winding of this relay, contact 6 of selais 2406, contacts 2 of relays 2205, 2203, and 2201, contact 1 of relay 1903 and earth. In operation, relay 2211 establishes a circuit for a relay corresponding to the level of the secondary coupling switch connected to the free recorder-sender.

   In this case it can be assumed that this is the zero level and that a circuit is established for relay 1805 comprising: the battery, the winding of this relay, contact 1 of relay 1901, contact 1 of relay 2206, contact 3 of relay 2211 and earth. Relay 2209 was actuated from the battery associated with contact 2 of relay 1709 and a circuit is now established to double-test the recorder-sender which was found free.

   To this end, a circuit is established for relay 1320 comprising: earth, the winding of this relay, contact 37 of relay 1206 and the corresponding contact of relay 12U7, conductor 1257, contact 1 of relay 2209, contact 3 of relay 1805, contact 5 of relay 1805, contact 1 of relay 1809, the contacts of other similar relays corresponding to the other levels of secondary switch, contact of relay 1810 and the battery. In operation, relay 1320 connects a test circuit in the coupling control circuit to the free incoming recorder-sender and also connects ground to a relay 1901 of the test circuit in the control circuit.

   The circuit for the re-

  <Desc / Clms Page number 37>

 The 1901 law consists of: earth, contact 4 of relay 1320, contact 20 of relay 1206 and a similar contact on relay 1207, conductor 1241, winding of relay 1901 and the battery. The control test circuit is associated with relay 918 in the recorder-transmitter extending from the control circuit to the armature and the associated contacts on this relay. When relay 918 is normal, indicating that the recorder-sender is free, the battery is associated with the test conductor. When the incoming recorder-sender is occupied, the earth is associated with this conductor. , since relay 918 is actuated.

   This conductor extends through contact 3 of relay 1320, contact 34 of relay 1206, and a similar contact of relay 1207, to conductor 1254 in the control circuit, thence through contact 6 of relay 2206, contact 1 from relay 2211, the winding of test relay 2403, tube 2410 to the battery through contact 4 of relay 1901. The winding of test relay 2405 is also connected in the tube test circuit . This comprises: the battery, contact 4 of relay 2402, the winding of relay 2405, contact 7 of relay 2406 and tube 2410. At this point the test relays of the tube test circuit at the Fig. 24 are connected to the recorder-sender in order to carry out a test.

   The recorder-sender conductor presents a battery voltage of a peculiar value to the tube of a species such that if no other control circuit attempts to select that recorder-sender, the plate resistor of tube 2410 will drop instantly, causing relays 2403 and 2405 to operate. If at this time another control circuit attempts to grab this recorder-sender or has grabbed the recorder-sender, relay 2405 will not operate. If we assume that this relay is working,

  <Desc / Clms Page number 38>

 a circuit comprising: the battery, the winding of this relay, the contact of the relay 2405 and the ground is established for the relay 2402.

   It is also closed to block relay 2206 a circuit which includes: the battery, the right coil of relay 2206, contact 5 of relay 2211, contact of relay 2405 and earth. When relay 2402 operates, this blocking earth is replaced by contact 5 of relay 2402 for contact 4 of relay 2406 and the earth connected to it. If the test circuit relay 2403 operates, and if relay 2405 does not operate, a circuit is not established for relay 2402, but a circuit is established for the counter switch, comprising: earth, contact 3 of relay 2402, contact of relay 2403 and armature of switch 1911.

   This establishes a circuit to actuate this relay 1906 and 1907, / which after a certain period of time operates a warning circuit. However, under normal circumstances a different inbound register-sender would be taken for the test. When two control circuits attempt to enter the same recorder-sender, the tube circuits in both control circuits do not function until one of these circuits has gripped the recorder-sender.

   When this recorder-sender is seized, a ground is removed from the conductor extending to one of the relays 2202, 2204 or 206, and in this case it will be removed from the relay 2206 which will drop. other free recorder-senders associated with the control circuit at this time, the next recorder-sender in the order of the chain passing through relays 2206, 2204, 2202 would be chosen and tested. The purpose of activating the count circuit from the contact of relay 2203 is to transfer the control circuit devices to a second choice when testing one control circuit interferes with another. The operation of the vacuum tube 2410 is
28 n i

  <Desc / Clms Page number 39>

 instantaneous and such irregularities are very rare.



   Assuming that the original test was successful, the inbound register-sender described here is made busy with the operation of the vacuum valve 2410, and is gripped by the switch contacts as follows.



  In operation, relay 2402 establishes circuits for the selection electromagnets associated with the level connected to this incoming recorder-sender. The relay 2402 establishes for the relay 1803 a circuit comprising: the battery ie, the winding of this relay, the contact 2 of the relay 1802, the contact 4 of the relay 2402, the contact 3 of the relay 2303 and the earth. Relay 2402 also opens the circuit for the category relay at its contact 10, causing relay 1331 to release, which disconnects the large group of loggers-senders from the control circuit. This opens all the circuits for this relays 2202, 2204, 2206 / which constitutes a number of relays equivalent to the number of recorder-senders associated with the control circuit.

   The relay 2206 remains actuated, since it is locally blocked in the control circuit as described previously. A circuit comprising: the battery the winding of this relay, the contact 8 of the relay 2402, the contact 3 of the relay 1903 and the earth is established for the relay 2306. A circuit is established for relay 1708 comprising: winding earth of this relay, contact 1 of relay 1709, contact 1 of relay 2207, contact 6 of relay 2402, contact 7 of relay 1903 and the battery. The circuit for relay 2403 is also open at contact 3 of relay 2402 so as to make relay 2403 ineffective.



  In operation, relay 1803 establishes a hold circuit for junction relay 1710, so that it will not drop out when its control circuit is open.



  Relay 1803 establishes a circuit for operation

  <Desc / Clms Page number 40>

 of the primary selector electromagnet 807 to connect the circuit of the incoming junction to the appropriate secondary coupling switch level. This circuit comprises, the earth, the selector electromagnet 807, the contact 23 of the relay 1206 and a corresponding contact of the relay 1207, the conductor 1243, the contact 3 of the relay 1802, the contact 1 of the relay 1803, the contact 2 of relay 1710, resistor 1730 and the battery. A circuit is also established to operate the associated secondary switch selection magnet at the level of the secondary switch which is connected to the selected incoming recorder-sender.

   In this case, it can be assumed that it is the selection electromagnet 821 which is energized in a circuit comprising the earth, the winding of this relay, the contact 31 of the relay 1206 and the corresponding contact. of relay 1207, the conductor of relay 1251, contact 3 of relay 2207, contact 3 of relay 1708, contact 7 of relay 1805, contact 5 of relay 1901 and the battery. When the primary selection electromagnet is actuated, a circuit is established for relay 2302. This comprises: earth, the contact of the selection electromagnet 807, contact 25 of the relay 1206 and a similar contact of relay 1207, lead 1245, winding 2302 and the battery.

   By operating the secondary selection electromagnet establishes for relay 2301 a circuit comprising: the battery, the winding of this relay, the conductor 1246, the contact of the relay 1207, the + contact 26 of the relay 1206, the contact of the selection electromagnet 821, and the earth.



  When the relays 2301 and 2302 are actuated, a circuit is established for the holding electromagnets of the selected coupling switch combination. This circuit includes: the battery, the winding of the electro-

  <Desc / Clms Page number 41>

 holding mantle 810, and the winding of the holding electromagnet 822 in parallel, contact 3 of relay 1314, contact 3 of relay 1206 and the corresponding contact of relay 1207, conductor 1224, contact 3 of relay 2306, which is now actuated, contact 2 of relay 2206, contact 6 of relay 2211, contact 2 of relay 2301, contact 1 of relay 2302, contact 1 of relay 2303 and earth.

   In operation, the selector electromagnets and the hold electromagnets close the cross point of the primary switch 806 and the cross points of the secondary switch 820 to connect the incoming junction to the recorder- selected incoming sender. This establishes a circuit for relay 2304 in the control circuit and relay 918 of the incoming recorder-sender.



   The earth applied to the windings of the holding electromagnets for their operation now extends through contact 3 of secondary switch 820, conductor 842, the coil of the recorder-sender relay 918 to the battery, operating this last relay.



  This earth also extends through contact 3 of primary switch 806, contact 6 of relay 1314, contact 6 of relay 1206 and the corresponding contact of relay 1207, conductor 1227, contact 6 of relay 1710, contact 1 of relay 1707, the winding of relay 2304 to the battery, actuating the latter relay. A circuit is then established for relay 2303 comprising: the battery, the winding of this relay, contact 2 of relay 2402, contact 1 of relay 2301, contact 2 of relay 2302, contact 2 relay 2304 and earth. A blocking circuit is established for relay 2303 comprising the battery, the winding of this relay, contact 2 of relay 2402, contact 3 of relay 2303 and earth.

   When operating, relay 2303 drops the relays.

  <Desc / Clms Page number 42>

 but 1806 and 803 which opens the control circuit for the primary selection electromagnet 807 which dissociates the earth from the contact of the selection electromagnet and causes the relays 2302 and 1710 to release. If we refer to the incoming recorder-sender, the operation of relay 918 disconnects the earth from contact 1, indicating to the other control circuits that the recorder-sender is busy. Contact 4 at delay 918 disconnects the battery from the armature and connects the earth to the armature which extends through the test circuit to the coupling control circuit. Relay 924 of this recorder-sender is now energized by a circuit extending through the incoming junction, Figs. 1 and 7.

   This circuit includes: the battery, the winding of the split relay 104, the contact 7 of the relay 107, the contact 5 of the relay 105, the conductor 125, the contacts of the primary and secondary coupling switches, the conductor 845, the contact 1 of relay 912, the right and left windings of relay 924, contact 3 of relay 920, contact 2 of relay 918 and earth. Relay 924 operates in the traced circuit, but the high resistance of this relay prevents operation of relay 104. When operating, relay 924 establishes for relay 921 a circuit comprising: the battery, the winding of this relay, the contact of relay 924, the earth and contact 1 of relay 428.

   In operation, relay 921 establishes an obvious circuit for relay 922 and an obvious circuit for relay 920 which locks to ground applied to coltact 2 of relay 918. While operating, relay 921 grounds on conductor 842 for keep actuated the holding electromagnets of the primary and secondary switches and also connects the earth by its contact 2 to the conductor 851 to activate the relay of the incoming junction 709. This circuit comprises: the earth, the

  <Desc / Clms Page number 43>

 contact 2 of relay 921, contacts 12 of primary and secondary switches, conductor 131, contact 4 of relay 105, winding of relay 709 and the battery.



   While operating, relay 709 opens the lead of the coupling start circuit 751, causing the release of relay 1707 in the coupling control circuit, causing the release of relay 2304. The relay Logger-Sender 918 opened the test circuit, as established, causing relay 2405 to release, which now establishes a circuit for the 1903 control circuit release relay. baked for this release relay consists of: the battery, the winding of this relay, relay 2304 contact 1, relay 2401 contact, relay 2405 contact and earth.

   In operation, relay 1903 establishes a blocking circuit for itself through the contacts of all relays which now remain actuated and also causes these relays to gradually release, causing relay 1903 to drop out after the others relays have dropped out, preparing the coupling control circuit to be picked up by another incoming junction, outgoing junction, or repeater.



     ARRIVAL RECORDER-SENDER -------------------------------
The incoming recorder-sender apparatus which was operated as described in the previous paragraph, is that which was used to return the control circuit to stand-by and to initiate the operation of the selected recorder-sender. The circuits and apparatus of the incoming recorder-sender are now activated to prepare for reception of the area code and numeric digits from the calling remote toll office. The operation of the primary coupling switch 806 and secondary switch 820 connects conductors 840, 841 and 843 to 851 inclusive, from the recorder-sender to conductors 121 to 131 of the

  <Desc / Clms Page number 44>

 incoming junction.

   Conductor 842, as previously described, extends from the incoming recorder-sender to the holding electromagnets of the coupling switches and to the control circuit. A circuit is established at this time to energize relay 906. This circuit comprises: earth, contact 5 of relay 107, contact 12 of relay 104, contact 3 of relay 105, conductor 128, contact 9 of the primary and secondary coupling switches, conductor 847, contact 3 of relay 918, contact 3 of relay 1003, winding of relay 906 and the battery. Relay 906 locks to the earth applied to contact 1 of relay 920 and extends this earth through the circuit passing through conductors 848 and 128 on conductor 204 to maintain earth on this conductor, whenever relay 104 is actuated.

   On energizing, relay 921 establishes, as previously described, an obvious circuit for relay 913. On operation, relay 913 arranges the recorder-sender to receive optional category information. The battery extends, through contact 1 of relay 913, the windings of relays 915,910, 907, resistor 1002, contact 6 of relay 1000, conductor 846, contact 7 of the primary and secondary coupling switch, the conductor 126, the contact 10 of the relay 105, the contact 6 of the relay 104, the contact 6 of the relay 706, the resistor 724 to earth.

   The battery also extends through contact 2 of relay 913, the windings of relays 916, 911 and 908, resistor 1001, contact 1 of relay 1000, conductor 847, contact 8 of the secondary coupling switches and primary, conductor 127, contact 9 of relay 105, contact 4 of relay 104, contact 1 of relay 706, resistor 705, to earth. Relay 913 establishes a holding earth for relay 910 and the category indication relays and them connects earth to conductor 851, which

  <Desc / Clms Page number 45>

 comes in addition to the earth applied to this conductor by the relay 921 extending through the winding of the relay 709, as previously described.

   Relay 1011 is actuated from the earth applied to the contact of relay 915 and relay 1010 is actuated from the earth applied to the contact of relay 916. Each of these relays can be actuated in the circuits described, depending on the category of the junction. used for the call, and therefore on connection to contacts 1 and 6 of relay 706. When operating, each of these relays establishes a blocking circuit for itself to the earth applied to the contact. 3 of relay 913. The operation of either of these relays establishes the type of marker to be used for the connection, as will be described here.

   In operation, each of these relays also establishes a circuit for relay 1009, comprising: battery, relay winding, contact 2 of relay 1010 or contact 2 of relay 1011, relay 915 or 916 depending on which relay is operated, and the earth. While operating, the relay 1009 causes the operation of the relay 914 in the circuit comprising: the battery, the winding of this relay, the contact 3 of the relay 1009 and the earth. Relay 914 now short-circuits the high resistance winding of relay 924.



  The short circuit extends from the earth applied to contact 1 of relay 921, through contact 1 of relay 914 to the midpoint between the two windings of relay 924. On the opposite side of the left winding is associated the equal earth. - lement by contact 1 of relay 921. This removes the high resistance path of the circuit described previously and passing through the coil of the relay of the incoming junction 104, which now causes the operation of the latter relay. While operating, relay 104 opens the circuit for relays 915 and 916 which drop. When falling, relays 915 and 916 remove the shunt from

  <Desc / Clms Page number 46>

 the winding of relay 1000 which now operates in series with relay 1009.

   This circuit includes: earth contact 5 of relay 913, coil of relay 1000, contact 2 of relay 1009, coil of relay 1009, and the battery. While operating, relay 1000 connects the contacts of relays 915 and 916 to the contacts of steering relays 514, 516, 518, 522, 1110 and 1114. When operating, relay 1000 also closes a circuit for the operation of relays 514 and 515 in preparation for recording incoming pulses from the remote office and disconnects leads 846 and 847 from relays 915 and 916 and other pulse relays in series therewith. The circuit for relays 514 and 515 includes: the battery, the windings of the two relays in series, contact 1 of relay 517, contact 2 of relay 923 to earth, and contact 3 of relay 1000.

   Relay 514 is blocked to earth on its control circuit by its contact 2 connected directly to the earth applied to relay 1000.



  Relay 514 establishes a control circuit for relay 923 of the battery by winding relay 923, contact 2 of relay 514 to ground applied to contact 3 of relay 1000. While operating, relay 923 establishes a circuit for relay 1004 comprising: earth, contact 2 of relay 922, contact 1 of relay 923, winding of relay 1004, contact 2 of relay 1004, contact 4 of relay 903, contact 1 of relay 901, conductor 841, contact 2 of the secondary coupling switch, and contact 2 of the primary coupling switch, conductor 122 of the incoming junction circuit, contact 7 of relay 105, contact 4 of relay 706, contact 3 of relay 706, horn 9 of relay 722,

   and the neck conductor 113 extending from the remote office 100 and from contact 4 of the relay

  <Desc / Clms Page number 47>

 706 to the battery by winding relay 719, thereby establishing a control circuit for relay 1004.



  Relay 1004 locks to the battery on its contact 2 and connects pulse relays 915, 910 and 907 to the tip conductor 840 and pulse relays 916, 911 and 907 to the neck conductor 841. These conductors are extend through contacts 1 and 2 of the secondary and primary coupling switches to conductors 121 and 122 of the incoming junction circuit and from there to tip and neck conductors to the remote office.

   Relay 1004 also opens the way from tip and neck conductors 840 and 841 passing through resistor 904 and capacitor 905. For all service categories a code pulse is transmitted and, therefore, for all service categories relays 514 and 515 are activated as soon as the recorder-sender is entered. The circuit for these relays has been described previously.



   The pulses are transmitted from the remote office 100 by the application of a 48 volt battery or earth through high or low resistors, which voltage is transmitted to the recorder-transmitter by the conductors. 840 and 841 to selectively actuate relays 915,910, 907,916, 911 and 908.



  These relays actuate the recorders shown in Figs. 5 and 11 in accordance with the following table:
 EMI47.1
 
 <tb>: <SEP> Z <SEP>: <SEP>: <SEP> ABC <SEP>: <SEP> DEF <SEP>: <SEP> GHI: <SEP> JKL <SEP>: <SEP> MNO <SEP>: <SEP> PRS <SEP>: <SEP> TUV <SEP>: <SEP> WXY <SEP>: <SEP> Stake <SEP> in
 <tb>
 <tb>
 <tb>
 <tb>: <SEP> 0 <SEP>: <SEP> 1 <SEP>: <SEP> 2 <SEP>: <SEP> 3 <SEP>: <SEP> 4 <SEP>: <SEP> 5 <SEP> 6 <SEP>: <SEP> 7 <SEP> 8 <SEP>: <SEP> 9 <SEP> walk
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> driver <SEP> "T" <SEP>: <SEP> L + <SEP>: <SEP> H + <SEP>; <SEP> L- <SEP>. <SEP> H- <SEP>. <SEP> L + <SEP>: <SEP> L + <SEP>: <SEP> H + <SEP>: <SEP> L- <SEP>. <SEP> H- <SEP>; <SEP> L + <SEP>: <SEP> H +
 <tb>
 <tb>
 <tb>
 <tb> Driver <SEP> "R" <SEP>: <SEP>: <SEP>: <SEP>: <SEP> L-: <SEP> H + <SEP>; <SEP> H + <SEP>: <SEP> H + <SEP>:

    <SEP> H <SEP> + <SEP>: <SEP> H- <SEP>: <SEP> L-
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> Relay <SEP> 915 <SEP>: <SEP>
 <tb>
 <tb>
 <tb>
 impulse <tb> <SEP> 916 <SEP> X <SEP>. <SEP> X <SEP>. <SEP> X <SEP>. <SEP> X <SEP>. <SEP> X <SEP>. <SEP> X <SEP>. <SEP> X
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 3ion <SEP> 910 <SEP> X <SEP> X <SEP> X <SEP> X <SEP> X
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 911 <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 907 <SEP>: ......... <SEP> X <SEP>: <SEP> X <SEP> X <SEP>: <SEP> x <SEP> y <SEP> ....: ......
 <tb>
 <tb>
 <tb>
 <tb>



  908 <SEP> X <SEP> X <SEP>: <SEP> X
 <tb>
 

  <Desc / Clms Page number 48>

 
 EMI48.1
 
 <tb> Relay <SEP> Ler <SEP> X <SEP> X <SEP> X <SEP>: <SEP> ....: <SEP> x <SEP>: <SEP> ... <SEP>: <SEP> X <SEP>: <SEP>
 <tb>
 <tb> of record <SEP> 2nd <SEP> X <SEP>: <SEP> X <SEP> X <SEP>: <SEP> X <SEP>: <SEP> ... <SEP>: ....:
 <tb>
 <tb>
 <tb> gis- <SEP> 3rd <SEP>: ...: ...: ...: ...: <SEP> X <SEP> X <SEP>: <SEP> X
 <tb>
 <tb>
 <tb> treurs <SEP> 4th <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: ....: <SEP>
 <tb>
 H + indicates low resistance earth.



  H- indicates a 48v battery. low resistance.



  L + indicates high resistance earth.



  L- indicates a 48v battery. high strength.



  X indicates an actuated relay.



   Logger A relays consist of relays 502,503, 504 and 505, with relay 502 referred to in the Table as the first logger relay and relay 505 as the fourth relay. Recorder B relays consist of relays 506, 507, 508 and 509 and recorder C relays consist of relays 510, 511, 512 and 513. The above-mentioned recorders A, B and C constitute the relays. Recorder-sender call sign. The digital recorders are mounted in Fig. 11. Only two digital recorders are shown, the first digital recorder comprising relays 1100, 1101, 1102 and 1103 and the last digital recorder comprising relays 1104, 1105, 1106 and 1107.

   There can be as many digital recorders as needed, the intermediate recorders being the same as the first and last recorder and therefore not shown. The direction relays used to transfer the pulse conductors from one recorder to another include the relays shown on the left side of Figs. 5 and 11 establishing the connection with the various logger relays. Assume, for example, that pulses are @@@ transmitted from remote office 100 to store the area code and number CH3-1379. The transmission of an impulse to actuate recorder 2 first takes place in

  <Desc / Clms Page number 49>

 to indicate the letter C.

   This connects the 48 volt high resistance battery to tip conductor 840, causing relays 915 and 907. Relay 915 to actuate steering relay 516.



  Relay 517 does not operate at this time, since it is shorted. Relay 907 activates relay 503 of recorder A which locks to the extra-normal earth applied to contact 2 of relay 922. When this pulse is terminated, relays 915 and 907 drop. Relay 915 removes the short circuit from relay 517 which operates in series with relay 516. When operating, relay 517 opens the blocking circuit for relays 514 and 515 which drop. When actuated, relay 517 closes the conductors from the contacts of relays 907, 910, 908 and 911 to logger B selais 506 to 509 inclusive. On falling, relay 514 closes the circuit from the contacts of relays 915 and 916 to relay 518.

   On falling, relay 515 opens the conductors, from the contacts of relays 907, 910, 908 and 911 extending to the relays of recorder A. A pulse is now transmitted for the letter H, which is the same. only for number 4. This connects the high resistance ground to the tip conductor 840 and the 48 volt high resistance battery to the neck conductor 841. This causes the relays 915,916 and 908 to operate. relays 915 and 916 establish a circuit for relay 518 and relay 918 actuates, operating relay 508 of recorder B which locks to the extra-normal earth. The actuated relay 518 prepares a path for actuating the operating relay 519, when the relays 915 and 907 drop out at the end of the pulse.

   Pulse transmission continues to operate C-code recorders and digital recorders such as

  <Desc / Clms Page number 50>

 described. The value of the transmitted battery or earth pulse for these digits appears in the table above and should not be described here.



   After the transmission of the indicator and digital pulses is complete, the start pulse is transmitted over the tip conductor connecting the 48 volt high resistance battery to the neck conductor. causes relays 915,916, 910 and 911 to operate. Note that relay 917 is permanently connected to the contacts of relays 910 and 908, so relay 917 will respond whenever relays 908 and 910 operate. When relay 917 is actuated a circuit is established for relay 909. Relay 909 locks to the earth applied to contact 2 of relay 922. When the start relay pulse has ceased, the relay 917 drops out, which establishes the circuit for the start relay 1006.

   When operating, relays 910 and 908 actuate start-up logging relays 1120 and 1121 which are blocked to the earth applied to contact 2 of relay 922.



   When the pulse transmission from the remote office is complete, the far end circuitry and equipment are re-tuned and polarized relays are connected in the tip and neck conductors at the remote office. In operation, relay 1006 actuates relay 901. In operation this latter relay connects the battery through resistor 902 to conductor 841 which extends through the conductor from the junction to the remote office. The right coil of relay 1005 is also connected to conductor 840 extending through the junction conductor at the remote office.



  This energizes the polarized relays in the remote office, but relay 1005 does not work in this case, then

  <Desc / Clms Page number 51>

 that it is marginal and will not work in series with the polarized relays in the remote office. The polarized relays are operating, which indicates to the pulse circuit in the remote office that the sending inbound recorder has operated so. When the polarized relays in the remote office are operating, they attach a direct earth to the driver-sender recorder 880 which operates relay 1005. Relay 903 now operates in series with the left winding of relay 1005 to ground applied to contact 4 of relay 1000.

   When operating relay 903 causes relay 901 to release, which reconnects terminating resistor and capacitors 904 and 905 between the tip and back conductors. This signals the remote office that the close pulse has been appropriately transmitted from the remote office to the incoming recorder-sender.



   MARKER PEN -------------
After the recorder-sender registers have been set a marker connector is actuated and a free marker is chosen in order to find a free junction and set the switches between the calling end junction and the selected output junction. The marker apparatus is also actuated to indicate to the outgoing trunk if a repeater is required in the telephone link. In preparation for choosing a free marker connector, shown schematically at 610, relay 522 is actuated in the steering relay circuit after the third callsign recorder has been set.

   The circuit for relay 522 includes: the battery, the winding of this relay, contact 1 of relay 518, contact 1 of relay 516, contact 1 of relay 515, contact 2 or 5 of relay 1000, contact relay 915 or 916 and earth. It is therefore

  <Desc / Clms Page number 52>

 established for relay 413 a circuit comprising: the battery, the winding of relay 413, contact 2 of relay 522, contact 1 of relay 423, contact 2 of relay 419, contact 1 of relay 922 and Earth . Relay 413 is blocked by the winding of relay 414, contact 3 of relay 515 to earth applied to contact 1 of relay 922.

   By operating the relay 413 drops the relay 422 which was previously actuated from the earth applied to contact 1 of the relay 922 and blocks the relay 413 by the winding of the relay 414, the contact 4 of the relay 413, to the earth applied to the contact. 1 of relay 922. Relay 415 is actuated from the battery by its winding, contact 2 of relay 417, contact 2 of relay 413 to the earth applied to the contact of relay 422. Relay 413 also associated the relay. battery through its contact 1 and contact 1 of relay 416 to the coil of relay 411 which operates if the preferred connector is occupied since earth is associated with the top coil of relay 411 when a busy connector is encountered.

   Assuming relay 411 remains normal, a circuit is established to initiate energization of marker connector 610. The recorder-sender is arranged to choose either a trunk marker or a marker which is used to establish links. within the trunk office network by the operation of relay 1122 or relay 1123 which are under the control of relays 1010 and 1011 selectively actuated by circuits established in the circuit of the calling terminating junction as previously described . When a combined trunk and termination marker is employed, only one switch-on circuit is used.

   For the explanation of this circuit, it will be assumed that the trunk relay 1123 is energized, because the relay 1010

  <Desc / Clms Page number 53>

 was energized by a calling incoming junction and a start circuit is established by the contact of this relay. When relay 415 is energized, this starting circuit comprises: the battery, contact 1 of relay 415, contact 4 of relay 416, contact of relay 1123, conductor 1131, and a starting relay. step into the marker connector. A large number of conductors are now connected from the arrival recorder-sender to the chosen marker.



   When the recorder-sender and the marker are first connected to each other, a number of conductors are grounded, so that all of the marker-recorder relays connected to the conductor of the recorder-sender are activated. This causes a daisy-chained circuit to be closed via the recording equipment in the marker to actuate the marker-on relays.



  This opens a common control circuit and de-energizes all marker relays except those actuated through grounded conductors in the recorder-sender by gear selectively actuated by the junction. arrival call. By activating all the relays in the marker and then letting those that you do not wish to leave activated drop down, the continuity of the conductors is checked and made sure that they are free from earth or foreign contacts. Callsign records and other records are now transferred from the recorder-sender to the marker to provide the marker with data to enable it to choose a free outgoing trunk extending to a particular office.



  A particular feeder relay is chosen according to these records and the switches shown in Fig. 2

  <Desc / Clms Page number 54>

 are set to connect the incoming junction to the chosen outgoing junction. Two of the records transferred from the incoming recorder-sender to the marker indicate whether a repeater is required for that telephone link.



   SELECTION OF A REPEATER BY THE MARKER ---------------------------------------
As previously stated, a voice amplifying repeater is necessary for good transmission when the incoming junction is a long junction and when the outgoing junction is also a long junction, and therefore the marker needs a signal indicative of the species of the two junctions, incoming and outgoing, to automatically determine whether a repeater should be chosen and introduced into the talk leads of the outgoing junction, In the systems described, unidirectional voice amplifying repeaters are shown for each way in the four-wire transmission system extending through the office equipment.

   These two paths can be connected to a two-wire trunk line or trunk extending to a remote office through the hybrid coil windings as shown in the left side of the outgoing trunk circuit, Fig. . 3, or both ways of the system can be connected directly to the equipment in the remote trunk office, where hybrid coils are not required. As previously established, voice amplifying repeaters are inserted in each transmission path of outgoing junctions under the control of the marker when the trunk lines connected to each other are of sufficient length to require voice amplification. .



  When shorter junctions are connected

  <Desc / Clms Page number 55>

 to each other, voice amplifying repeaters are not necessary and the marker therefore indicates that repeaters will not be interposed in the talk leads of the junction. The system can be adapted to a transmission system as well. two-wire than the described four-wire transmission system. A long earth incoming junction, as shown, connected to contact 9 of relay 104 to establish a circuit to the recorder-sender, indicating the type of the associated junction.

   The following series of operations occurs as soon as the coupling switches in Fig. 8 establish a connection between the incoming trunk, Fig. 1 and 7, and the incoming recorder-sender, Figs.



  4, 5, 9, 10 and 11. A circuit is therefore established for the relay 520 of this incoming recorder-sender, known as the incoming long junction relay. This circuit extends from the earth applied to the contact 9 of the relay of the incoming junction 104, by the contact 1 of the relay 105, the conductor 123, the contact 4 of the primary and secondary coupling switches, the conductor 843, the contact 2 of relay 914, the winding of the long incoming junction relay 520, to the battery. Relay 520 establishes the blocking circuit to the earth applied to contact 1 of relay 922. It will be recalled that relays 104 and 914 were normal when the recorder-sender was seized by the coupling and connected to the incoming junction but were actuated. later .

   When operating, relay 914 opens the operating circuit for relay 520, but this latter relay remains actuated on its blocking circuit after a free marker has been entered, a circuit is closed to the marker to activate the relay. 600 also known as the long inbound trunk relay. This circuit includes: relay 520 contact 2, marker connector,

  <Desc / Clms Page number 56>

 conductor 619, the winding of the relay 600 and the battery. Therefore, the recorders of the marker are operated according to the records transmitted to the recorder-sender from the calling terminating junction and a route relay, such as 602, is chosen by the contacts of the recorders shown schematically at 601. .

   The feeder relay chosen indicates the character of the outgoing junction to be used to improve the telephone link, either by establishing a circuit for relay 606, through the contact of relay 600, or by leaving this circuit open. Therefore, the character of the two junctions will now be indicated to the marker. If the outgoing trunk employed is not long enough to require the use of a repeater, this repeater selection circuit is not established by the feeder relay, and therefore relay 600 can be actuated to. indicate a long inbound trunk, but if a short outbound trunk is used to complete the link, the repeater selection circuit will not be established.

   In the present example, it can be assumed that a repeater is needed for the telephone lines or trunks to be connected to each other and that an obvious circuit is established for relay 606, comprising: the contacts of the relays 602 and 600, the coil of relay 606 and the battery. Connector circuits are used between the marker and the primary and secondary switches as shown in Fig. 2, in order to choose a free path between the switches connected to the chosen outgoing junction and to the calling terminating junction. Until such time as a free outgoing junction has been chosen and entered and routes have been created for them to function properly, some marker circuits are kept open.



  As shown in Fig. 6, such a circuit extends between the

  <Desc / Clms Page number 57>

 output coupling connector 604 and what is known as an output relay 603. This circuit is, however, established as soon as a free output junction is found and made occupied for use in a telephone link. A circuit is therefore established for relay 605 to actuate a relay in the outgoing junction circuit used later for the selection of the repeater. The marker thus automatically creates a switch-on circuit for the selection of a repeater.



  This circuit includes: the two windings of the relays 600, the contact of the relay 608, the contact of the relay 606, the two contacts 1 and 2 of the relay 105, the conductors 620 and 621, the incoming recorder-sender, the ring - incoming tion, and outgoing junction. conductor 620 extends through marker connector, contact 2 of relay 423, conductor 843, contact 4 of secondary and primary coupling switches, conductor 123 of incoming junction, contact 1 of relay 105 , contact 10 of relay 104, conductor 203, primary and secondary output connection switches 210, 211, 213 and 214, conductor 303, contact 5 of outgoing junction relay 306, lower winding or shock of the delay coil / 307, contact 6 of relay 308,

   contact 2 of repeater relay 322 to earth through its lower winding. This circuit is done simplex, and on the tip and nape conversion conductors and therefore conductor 621 will also extend through marker connector, incoming recorder-sender, relay contact 3 423, conductor 844, contact 5 of the secondary and primary coupling switches, conductor 124, contact 2 of relay 105, contact 8 of relay; 104, conductor 202, connection switches 210, 211, 213 and 214, conductor 302, contact 3

  <Desc / Clms Page number 58>

 of relay 306, the upper winding of the delay coil 307, the contact 6 of the relay 308, the contact 2 of the relay 322, the lower winding of the relay 322, than to earth.

   Note: / in Fig. 2, the wires included in the Z brace go to the outgoing junction frame switches. In the circuit described above, the relay of outgoing junction 322 does not operate due to the high resistance of the lower windings of relay 608. Relay 608, however, operates in the circuit described and has a control circuit associated with it. relay 607 going from the battery through the winding of this last relay, the contact of relay 608, to the earth applied to contadt 2 of relay 6030 When operating, relay 607 establishes a blocking circuit for itself. even through its contact 2 and a short-circuit path passing through its contact 1.

   The lower winding of relay 608 is therefore bypassed and a circuit is established which comprises: the battery, the upper winding of relay 608, contact 1 of relay 607, contact of relay 606 and conductors 620 and 621, this which causes repeater relay 322 to operate in the outgoing junction circuit. On energizing, this latter relay establishes for itself a blocking circuit comprising the battery, its upper winding, contact 3 of relay 308, and the earth applied to contact 4 of relay 319 which operates as soon as this outgoing trunk is entered.

   The control circuit for relay 319 extends from the battery through the coil of this relay, contact 3 or relay 320, contact 7 of relay 305, test lead 340, terminal block relays 609 from the marker to ground through the marker junction test circuit. As will be seen in the following (- from the description there is provided a progressive circuit arrangement. Fig. 3, so that a recorder-output-sender and a repeater can be successive-

  <Desc / Clms Page number 59>

 chosen. Repeater relay 322 remains blocked until after the outgoing recorder-sender has been selected by the coupling circuit and has transmitted the pulses to a remote office.

   This succession of operations is introduced into the system so that the incoming marker and recorder-sender can be released as soon as possible. The marker having transmitted a signal to the device actuating the outgoing junction, which will cause the selection of a repeater, fulfilled its role since before that, the outgoing junction was chosen and the switches were actuated between the incoming junction calling and the outgoing trunk.



  As soon as an outgoing recorder-sender has been associated with the incoming recorder-sender by the outgoing trunk circuit, and the numerical digits have been transmitted from the incoming recorder-sender to the recorder - outgoing sender, this incoming recorder-sender can be released.



   COUPLING SELECTION SERVING UND JUNCTION OUTPUT
AUNT.



   -----------------------------------------------
As previously established, the marker tries a number of outgoing junctions by junction test conductors, such as 340. When a free junction is found, the marker connects a low resistance earth to that conductor to make the junction. - station occupied and to activate relay 3.19. The circuit for actuating this relay is that which is described previously. While operating, relay 319 immediately associates earth with the start circuit of a coupling to find a starting recorder-sender. This circuit is established before the marker has finished setting the switches in Fig. 2.

   The coupling start circuit consists of earth, contact 3 of relay 319, contact 3 of relay 320, conductor 331, contact 1 of relay 1310,

  <Desc / Clms Page number 60>

 1311 coupling start relay bearing and battery. The category signal to direct the operation of the coupling is established by contact 4 of relay 320 when that relay is normal thus conductors 338 and 334 are connected together, later actuating the switchgear in the coupling control circuit by the same. manager to choose an outgoing recorder-sender. This will be described in detail after the coupling control circuit has been chosen.



   In operation, relay 1311 establishes circuits to energize a connector which tends to associate the outgoing junction with a free coupling control circuit shown in Figs. 17, 18, 19, 22, 23 and 24 inclusive.



  The control circuit in these latter figures is employed for the selection and actuation of a combination of coupling switches shown in FIG. 8 to connect the outgoing trunk to an outgoing recorder-sender, in the same way as described for the selection of an incoming recorder-sender and association of this inbound recorder-sender to the inbound trunk.



  The outgoing junction, Fig. 3, as described, is connected to one of the horizontal levels of a primary coupling switch which can be associated to operate with a secondary coupling switch by the operation of the selector electromagnet 803 to operate. this horizontal level and the operation of the maintenance electromagnet 809 controlling a certain bridge or vertical. The primary switch can have any number of bridges associated with different secondary switches to connect that outgoing trunk to an outgoing recorder-sender. A primary bridge is shown to connect this outgoing junction to the secondary switch level 823 controlled by the holding solenoid 825 of a particular bridge.

   This will be known here as

  <Desc / Clms Page number 61>

 switch combination, which has been described in detail in connection with the selection of an inbound recorder-sender.



   On operation, the ON relay 1311 establishes a circuit to find a free control circuit as previously described, which ultimately operates the multiple contact relays 1206 and 1207 to associate a control / free circuit with the circuits of the junction. outgoing, Fig. 3-. Upon energizing, relay 1207 establishes a circuit for the occupy relay 701 in the control circuit which associates ground to a number of conductors equivalent to the number of relays employed in the chain circuit in the upper part of the circuit. left of Fig. 12. As previously described, the selected control circuit is now indicated as busy with all other connector circuits and is taken to be used to connect the output recorder-sender to the outgoing junction. .

   The organization of the coupling switching arrangement and of the control circuits is such that a choice is made from a large number of output recorders-senders associated with the control circuit apparatus. In some cases, a number of free outgoing recorders-senders are simultaneously associated with the control circuit, but only one of these outgoing recorder-senders is used. This selection is made by signaling to the control circuit which level a special secondary coupling switch is connected to a uttered free start sender-recorder.

   As previously stated in the description, the control circuit relays 2201, 2203, and 2205 are each associated with a different switch combination comprising a bridge over a switch.

  <Desc / Clms Page number 62>

 primary and a bridge over a secondary switch each having a number of levels. The contacts of these relays are connected to the large number of output loggers-senders. The windings of relays 2202, 2204 and 2206 are connected with this large number of output recorders-senders to the contacts of relays 2.01, 2203 and 2205. There are as many relays 2202, 2204 and 2206 as there are output recorder-senders simultaneously associated with the control circuit and all these relays associated with free output recorders senders are actuated.

   Their operation, however, takes place after the last indication has been transmitted from the outgoing junction to the control circuit.



   When a particular junction in the subgroup of junctions activates a coupling, it is first necessary to identify the subgroup to which it is associated. The coupling control circuit is provided with a number of relays 2214 to 2212 equivalent to the number of subgroups of junctions. In this case, the outgoing trunk belongs to the same subgroup as the incoming trunk, Figs. 1 and 7 and the relay 2214 is thus actuated to indicate the sub-group of junctions which require service. The circuit for this relay is the same as that described previously. A circuit is therefore established for the multiple contact relay 1314 which is the relay serving this sub-group of junctions.

   There are a certain number of junctions in each sub-group served by the same start relay 1311. They are represented in the control earth circuit by relays 1706 to 1710. The start / which actuated relay 1311 extends through all the contacts of relay 1310. After relay 1314 has operated, this earth extends through as many contacts of relays 1310 and 1314 as there are junctions in the

  <Desc / Clms Page number 63>

 subgroup. This earth also extends through contact 15 of relay 1314 to energize the start-up relay 1705 in the control circuit. The trunks subgroup relays 1706 through 1710 represent all trunks in the group are now energized.

   Relay 1703 now operates on a daisy chain circuit through the contacts of relays 1710 through 1706, which establishes a circuit for relays 1702 and 1310. By operating relay 1310 removes ground from the turn-on circuit of all conductors. and of all contacts except the contact of relay 1314 associated with the start earth in the outgoing junction served, which causes the release of all relays 1706 to 1710 except the one associated with the circuit of the outgoing junction , Fig. 3, which is represented by relay 1706. The latter relay is therefore blocked in its position. While operating, relay 1310 also opens the control circuit for relay 1705 which now drops out and establishes a circuit for relay 1707.



   Since the control circuit can choose either an inbound recorder-sender, outbound recorder-sender, or a repeater, a categorical signal must be transmitted from the junction to determine the character of the equipment to be sent. choose by coupling control circuit. This category signal is given on outgoing junction conductors 333 and 334. Contact 334 is specific to the junction served. Conductor 333 is associated with a particular category of service relay in the coupling control circuit.

   In this case, the category relay actuated is 1804 and the circuit for this relay comprises: the battery, the winding of the relay 1804, the conductor 1233, the contacts of the relays 1207 and 1206,

  <Desc / Clms Page number 64>

 contact 12 of relay 1314, conductor 333, contact 5 of relay 320, conductor 334, contact 11 of relay 1314, contacts of multiple contact relays 1206 and 1207, conductor 1232, contact 7 of relay 1706 actuated, similar contacts of normal relays for other junctions, contact 7 of normal relay 1710, contact 2 of relay 1711, which is actuated, contact 2 of relay 2303 and earth. The category of the circuit to be chosen is therefore given to the coupling control circuit which, in this case, is an outgoing recorder-sender represented by relay 1804.



  A connection is now made to associate a large number of outgoing recorder-senders to the control circuit by the operation of relay 1330. A circuit for operating this relay includes: earth, winding of relay 1330, contact 16 of relay 1314, contacts of relays 1206 and 1207, conductor 1237, contacts 4 of relay 1709 which is actuated, contact 3 category 2210 relay which is normal, contact 3 of category 1806 relay which is normal, contact 3 of category 1804 relay which is actuated, contact 4 of relay 2304 which is normal, contact 9 of relay 2402 which is normal, and the battery.

   Relay 1330 is actuated in the circuit traced to associate the test leads of a large number of outgoing logger-senders with the control circuit apparatus. One of these test circuits is shown connected to contact 1 of relay 1330 extending over conductor 1538 through contact 8 of relay 1500 in the outgoing recorder-sender. Relay 1500 is normal in a free outgoing logger-sender and energized in a busy outgoing logger-sender, for this reason, conductor 1538 is either associated with ground applied to contact 1 of relay 1501 when the circuit is free, and

  <Desc / Clms Page number 65>

 open when busy.

   Relay 1539 is a second test lead which is associated with the battery through contact 2 of relay 1501 and resistor 1502 when the circuit is free and associated with ground on contact 1 of relay 1500 when the circuit is. busy.



   These two conductors are used in the outgoing recorder-sender test. The control circuits for the registers-senders tested are wired at a number of switch levels on a number of secondary coupling switches such as 823. Each secondary coupling switch level is associated with a bridge. different from a primary coupling switch which is connected to the outgoing junction. This makes a large number of outgoing recorder-senders available for selection, so that usually one or more of these are found free.



   Some verticals of the secondary coupling switches can associate various stages with outgoing recorders-senders, other stages with incoming recorders-senders, still others with repeaters and may be associated with one. primary switch by respective corresponding contacts. The aforementioned verticals and horizontal levels of the switches are available for other coupling control circuits, and therefore when an attempt is made to obtain the service of a free outgoing recorder-sender, a verification is made to ensure which couplings are available for testing, ie which couplings have not been taken for use by other control circuits.

   When a coupling has been taken for use by another control circuit, a ground is applied to the winding of the holding electromagnet to actuate the holding electromagnet.

  <Desc / Clms Page number 66>

 primary and secondary coupling switches. The conductors from all holding electromagnets extend from the coupling switches through contacts such as 3, 4 and 5 of relay 1314 and similar contacts of multiple contact relays 1206 and 1207 to conductors such as 1224, 1225 and 1226.



  In each case there are as many of these conductors as there are couplings available, to be used in the selection of outgoing recorder-senders, and these conductors coming from all these holding electromagnets are extended by the contacts from relay 2306 to the gaache windings of relays such as 2201, 2203 and 2205. If earth is associated with the holding electromagnets of certain verticals, a circuit for these occupied couplings establishes an operating path for the aforementioned relays 2201 , 2203 and 2205 in order to prevent a test of loggers-senders associated with occupied secondary switches. When operating, any of these relays opens the operating circuit for relays 2202, 2204 and 2206.



  There are as many of these latter relays as there are output logger-senders available for testing, but only logger-senders associated with unactuated relays 2201, 2203 and 2205 are tested. Assuming that none of these relays are actuated, relays 2202, 2204, and 2206 are associated with test leads extending to outgoing recorders-senders, and all relays associated with free recorders-senders. are grounded from relays such as 1501 in outgoing loggers connected by circuits such as 1538.

   This circuit includes: contact 2 of relay 1330, contacts of multiple contact relays 1206 and 1207, conductor 1261, contact 3 of relay

  <Desc / Clms Page number 67>

 2203, the left winding of relay 2204 and the battery. Circuits for other similar relays are established following routes employing circuits already described and passing through conductors such as
1260 and 1262 extending to other contacts of relay 1330 to outgoing logger-senders. A chain circuit passing through the contacts of relays such as 2202, 2204 and 2206 automatically chooses the free recorder-sender to choose from.

   When this free start recorder-sender has been chosen, relay 2406 is actuated in a circuit previously described, which establishes circuits to actuate all relays such as 2..01, 2203 and 2205. This establishes a circuit. for relay 2211 as previously described to earth applied to contact 1 of relay 1903.



  In operation, relay 2211 establishes a circuit for a relay corresponding to the level of the secondary coupling switch connected to the free recorder-sender. This circuit includes the earth, contact 2 of relay 2211, a chain circuit passing through contacts 1 of non-actuated relays 2202, 2204 and 2206, contact 1 of the first actuated relay in the chain, which in this case can be assumed be relay 2204, which expands. the circuit through contact 2 of relay 1901, the winding of relay 1809 to the battery representing the level of the secondary switch to which the outgoing recorder-sender is connected. Relay 2209 was actuated from the battery associated with contact 2 of relay 1709, and a circuit is now established to perform a double test of the recorder-sender which appeared free during the test.

   For this purpose, a circuit is established for relay 1321, which comprises: earth, the winding of this relay, contact 38 of relay 1206 and a similar contact of relay 1207, conductor 12fi8, contact 2 of relay

  <Desc / Clms Page number 68>

 2209, contact 3 of relay 1809, contact 2 of relay 1805, contact 5 of relay 1805 which is normal, contact 5 of relay 1809 qqi is activated, contact 1 of relay 1810 which is normal and the battery . The relays 1321 and 1809 correspond to the level of the secondary coupling switch connected to the free recorder-sender. While operating, relay 1321 connects earth through its contact 4 to the control circuit to operate relay 1901.

   Relay 1809 is connected from the outgoing recorder-sender through contact 2 of relay 1321 to a test circuit in the coupling control circuit. This test circuit includes vacuum tube 2410 and relays 2405 and 2403. The recorder-sender associates a voltage of a particular value with tube 2410 in the control circuit of a character such as @@ if no other circuit tries to choose this logger-denart sender,

   the plate resistance of the tube will drop instantaneously causing relays 2403 and 2405 to operate. Assuming in this case that the outgoing recorder-sender is free and no attempt is made by another control circuit To capture this recorder-sender, these relays 2403 and 2405 can be assumed to be actuated, which establishes a circuit for relay 2402.

   When relay 2402 operates, a blocking earth is established for relay 2406. If the outgoing recorder-sender which was tried and was found free, is seized by another control circuit, before this double test either done, another free outgoing register-sender is chosen in the same way as described for inbound register-senders.



   A circuit is now established for relay 1803 as previously described for the operation of primary selector electromagnet 803. This circuit

  <Desc / Clms Page number 69>

 includes: earth, secondary switch solenoid 803, contact 24 of relay 1206, and a similar contact of relay 1207, conductor 1244, contact
4 of relay 1802, contact 2 of relay 1803, contact
2 of relay 1706 activated, contact 3 of normal relay
1710, and the battery. A circuit is also established for activating the secondary switch selection electromagnet associated with the level of the secondary switch connected to the selected outgoing recorder-sender.

   In this case, it can be assumed that the selection electromagnet 824 is actuated from the earth by its winding, contact 32 of relay 1206, and a similar contact of relay 1207, conductor 1252, contact 4 of relay 2207 which is activated, contact 2 of relay 1708 which is activated, contact 7 of relay 1809 which is activated to indicate the horizontal level of the secondary switch, contact 6 of relay 1805, normal contact / of a 1901 relay, to the battery. The circuits established by the contacts of the primary selection electromagnet and the secondary selection electromagnet are the same as those described for the selection of the incoming recorder-sender for the purpose of '' establish control circuits for relays 2302 and 2301.

   These last two relays being activated, a circuit is established for the holding electromagnets of the selected combination of coupling switches. this circuit includes: the battery, the windings of the holding electromagnets 809 and 825 in parallel, the contact 4 of the relay 1314, the contacts of the relays 1206 and 1207, the conductor 1245 of the control circuit, the contact 2 of the relay 2306 actuated, contact 2 of relay 2204 actuated, contact 2 of relay 2206 normal, contact 6 of relay
2211 activated, contact 2 of relay 2301, contact
1 of relay 2302, contact 1 of relay 2303 and earth.

  <Desc / Clms Page number 70>

 



  The operation of the selection electromagnets and the holding electromagnets closes the cross points or the corresponding contacts of the primary switch 801 and the secondary switch 823 to connect the circuit of the outgoing junction, Fig. 3, to the selected outgoing recorder-sender.



   The earth applied to the windings of the holding electromagnets for their operation now extends through contact 3 of secondary switch 823, conductor 1532, the winding of relay 1500 to the battery which actuates this relay and replaces the occupied earth maintained on the contact of this relay by the control circuit. In operation, the relay 1500 associates the earth with the conductor 1539 and opens the conductor 1538, so that the outgoing recorder-sender is made occupied independently of the control circuit.

   The earth applied to the holding electromagnets also extends to contact 3 of primary switch 801, to contact 7 of relay 1314, to contacts of relay 1206 and to a corresponding contact of relay 1207, through conductor 1228, contact 6 relay 1705 which is activated, the contacts of the other normal relays and contact 6 of relay 1710 normal, contact 1 of relay 1707, the winding of relay 2304 to the battery activating the latter relay. A circuit is then established for relay 2303 comprising: the battery, the winding of this relay, contact 2 of relay 2304 and earth, and a blocking circuit is established for relay 2303 to the earth applied to his contact 3.

   While operating, relay 2303 opens the control circuit for the primary selector solenoid and de-energizes other relays including relay 1706.



   If we now refer to the operation of the outgoing recorder-sender apparatus in

  <Desc / Clms Page number 71>

 In its relationship to the coupling control circuit, the relay 1500 when operating disconnects the battery from the driver 1539 and connects the earth to it. This reverses the current in the test circuit of the control circuit and causes relay 2405 to drop out. The coupling start circuit is opened by the outgoing junction circuit by the operation of the junction relay 320 as ex. - plied later. A circuit is thus established for the release relay of the control circuit 1903 which comprises: the battery, the winding of this relay, the contact 1 of the relay 2304, the contact of the relay 2401, the contact of the relay. 2405 and earth.

   While operating, the control circuit release relay 1903 establishes a blocking circuit for itself and causes the control circuit to return to normal, so that it can be grabbed for making another connection. . A circuit for relay 1509 can include: earth, its winding, contact 1 of relay 1514, contact 2 of relay 1512, contact 2 of relay 1500, conductor 1533, contact 6 of the secondary coupling switches and first 823 and 801, conductor $ 35, outgoing junction 321 relay contact 6, relay winding 306, and battery. Relay 1509 operates in a circuit described, but the high resistance of this relay prevents operation of relay 306.

   Circuits are established by the operation of the outgoing recorder-sender, which takes place gradually after the recorder-sender has been seized and other relays have been actuated; for example, relay 1509 while operating connects earth to its contact 2, to the winding of relay 1504 and to the battery, also connects earth to its contact 1 to block relay 1500. Relay 1505 is operated from earth applied to contact? 2 of relay 1504. Relay 1501 is ac-

  <Desc / Clms Page number 72>

 ted in an obvious circuit passing through contact 6 of relay 1500.

   The relay 1513 is actuated in a circuit comprising: the battery, the winding of this relay, the contact 3 of the relay 1512, the contact 1 of the relay 1504, the contact 1 of the relay 1503 and the earth; circuit is thus established for relay 1514, which comprises: the battery, the winding of this relay, the contact 3 of the relay 1513, the contact 1 of the relay 1501 and the earth. At this time, the relay 320 in the outgoing junction is actuated in a circuit which comprises: the battery, the winding of this relay, the contact 7 of the relay 321, the conductor 350, the contacts 12 of the primary switch
801 and secondary switch 823, conductor 1507, contact 2 of relay 1514 and earth.

   Operating in the circuit described, relay 1320 opens the switch-on circuit for coupling, extending through its contact 4 and establishes a blocking circuit for itself to earth applied to contact 3 of relay 310.



   DEPARTURE RECORDER-SENDER.



   ----------------------------------
Relay 1500 connects the battery to circuits including the windings of relays 2006 to 2013, inclusive, to receive the category indication from the outgoing junction to determine the category of service required. starting from these relays extends to contacts 1 and 2 of relay 1524, through resistors 1522 and 123, contacts 1 and 5 of relay
1525, contacts 2 and 3 of relay 1506, conductors 1534 and 1535, contacts 7 and 8 of the secondary and primary coupling switches, conductors 357 and 358 of the outgoing junction, contacts 3 and 5 of relay 321 to contacts 1 and 4 of relay 306.

   In this case, the category of the junction is indicated by a ground connected by resistor 325 to contact 4 of relay 306 which establishes a circuit passing through the conductor.

  <Desc / Clms Page number 73>

 357. The other circuit described remains open. Relay 2005 in the outgoing recorder-sender is therefore activated to indicate the category of the outgoing trunk connected to it. This establishes a circuit comprising: earth, its contact, contact 1 of relay 1517, the winding of relay 2000 and the battery, which relay operates and locks to the earth applied to contact 6 of relay 1500.

   There are a large number of categories of junctions to indicate to the outgoing recorder-transmitter which justifies the 2000 to 2005 relays which are actuated under different conditions by the contacts of the 2006 to 2008 and 2010 to 2012 relays, inclusive - is lying. A circuit is established by relay 2000 to actuate relay 1510, which comprises: the battery, the winding of relay 1510, contact 1 of relay 2000, contact of relay 2006 and earth. An obvious circuit is established for relay 1524 to earth applied to contact 2 of relay 1510. Relay 1524 opens the circuit extending through conductors 1534 and 1535 and thus drops the actuated category 2006 relay in that circuit. .

   Relay 1511 operates in series with the blocking circuit for relay 1510 in a circuit comprising: battery, coil of relay 1510, contact 3 of relay 1510, coil of relay 1511, contact 6 of nelais 1500 and the earth. The relay 1511 establishes for the relay 1517 a circuit comprising: the battery, the winding of the latter relay, the contact 1 of the relay 1511 and the earth, and the relay 1517 when operating, transfers a certain number of conductors s' Extending from the contacts of relays 2006 to 2013, inclusive, to the contacts of the steering relays and to the recorder relays of Fig. 16. A category registration is now carried out by the contact of relay 2000 which was blocked in its position.

   In this case, the category

  <Desc / Clms Page number 74>

 rie recorded was for a loop system and a circuit was established for relay 2113 comprising: the battery, the windings of this relay, the contact 3 of the relay 2000 actuated, and by a circuit in series by the contacts of the relays 2001, 2002 , 2003, 2004, 2005 which are normal, to the earth applied to contact 2 of relay 1511. When operating, relay 2113 establishes a circuit for relay 2100, which when operating connects the earth applied to its contact 5 by the winding from relay 2026 to the battery to actuate the latter relay. This relay establishes an obvious circuit for relay 2025.



  Relays 1600 and 1601 are actuated in a circuit comprising contact 3 of normal relay 2024 and contact 2 of actuated relay 2025, as described later. Relay 2024 is actuated in a circuit comprising: the battery, the winding of this relay, contact 2 of relay 1600, contact 2 of relay 1505 and earth.



   A circuit is now established for relay 1509 by its winding, from right to low resistance to actuate relay 306 in the outgoing junction circuit to disconnect the category indicating leads and establish pulse circuits. from the incoming recorder-sender as will be described. The circuit for the right winding of relay 1509 comprises: earth, contact 1 of relay 2024, contact 1 of relay 2025, winding - of relay 1509, contact 3 of relay 1509, contact 2 of relay 1512, contact 3 of relay 1500, conductor 1533 and the battery as previously described by the winding of relay 306 of the outgoing junction circuit.

   It will be remembered that when relay 306 was first connected to the left winding of relay 1509, relay 1509 operated but relay 306 did not operate due to the

  <Desc / Clms Page number 75>

 high resistance of the left winding of relay 1509. Relay 306 now operates and establishes different circuits, one of which connects the winding of relay 305 through contact 6 of relay 306 to the circuit made simple. the delay coil 304 and the conductors 300 and 301.

   The switches of FIG. 2 having been actuated by the marker, a circuit is now established for relay 305, comprising: leads 300 and 301, switches of FIG. 2, the contacts 3 and 5 of the actuated relay 104, the conductors 126 and 127, the primary and secondary coupling switches, the conductors 846 and 847, the contacts of the relay 1000 in the recorder-sender d arrival, contacts 3 and 4 of relay 912, the lower winding of relay 400 and earth.



  Incoming recorder-sender relay 409 operates, but relay 305 does not operate due to the high resistance of the lower winding of relay 409. When operating, relay 409 establishes a circuit for relay 410 to ground. applied to contact 6 of relay 416. Relay 410 locks on its operating earth and connects earth through the top winding of relay 409 and the circuit described to relay 305 of the outgoing junction which now operates since The top winding of relay 409 has low resistance.

   On operation, relay 305 opens the circuit for relay 409 which now drops out, and on dropout establishes a circuit for relay 423 comprising: battery, coil of relay 423, contact of relay 414, contact 1 of relay 424, contact 1 of relay 425, contact 2 of relay 410, contact of relay 409, contact 6 of relay 416, and earth. Relay 423 connects the incoming recorder-sender pulse circuit to leads 844 and 845 extending to the out-going recorder-sender as will be described.

  <Desc / Clms Page number 76>

 later by establishing the pulse circuit.

   When relay 305 of the outgoing junction is actuated, the battery is connected by resistor 326, contact 3 of relay 305, contact 8 of relay 321, conductor 353, contact 9 of the primary coupling switches and secondary, conductor 1536 in the outgoing recorder-sender, the winding of relay 1508 to earth actuating this latter relay.

   When operating, relay 1508 indicates that the outgoing trunk and outgoing recorder-sender are ready for the transmission of pulses from the incoming recorder-sender to the outgoing recorder-sender and establishes now a circuit for relay 1515 from the circuit also established in the incoming logger-sender by the operation of relay 423. Relay 423 connects the battery through resistor 1026, contact 3 of relay 1019, the contact 2 of relay 423, conductor 844, contact 4 of the secondary and primary input switches, conductor 124, contact 2 of relay 105, contact 8 of relay 104, conductor 202, conductor 302, contact 4 of relay 306, contact 5 of relay 321, conductor 357,

   primary and secondary output coupling switches, conductor 1535, outgoing recorder-sender, relay 1506 contact 2, relay 1515 contact 3, relay 1515 winding, relay contact 3 1507, the contact:;. of relay 1506, the contact of relay 1508, to ground applied to contact 3 of relay 1505, which activates relay 1515 and indicates that all circuits are prepared to transfer the pulses from the incoming recorder-sender to the 'outgoing recorder-sender. Relay 1515 is blocked under control of relays 1505,1506 and 1507.

  <Desc / Clms Page number 77>

 



  * When operating, relay 1515 connects pulse relays 2006 to 2013 to pulse leads 1534 and 1535. The battery is connected to lead 1534 from relay 1500 to actuate relay 1018 in the incoming recorder-sender . This circuit extends through the relays 2010 to 2013 but none of these relays works in the circuit described. This circuit enters the incoming recorder-sender through conductor 843, extending through contact 2 of relay 423, the winding of relay 1018 to ground applied to contact 2 of relay 922. Relay 1018 blocks out. to the battery by resistor 1026 and actuates relay 1019 in an obvious circuit. This extends the pulse leads 843 and 844 to the contacts of the pulse relay 1020.

   On operation the aforementioned relay 423 transfers the conductors which are normally associated with relays 516, 518 and 521 to operate relay 413 to the windings of the steering relays to start the outgoing pulses from the digital recorder. . the outgoing pulses go from the logger relays for different networks depending on the last direction relay that was actuated to transmit the records to the marker. Assuming that relay 413 was actuated by the contacts of relay 522, as previously described, for a three-digit code, relay 522 operates to close a circuit to activate relay 521. These relays are associated with the relays. successive recorders.

   When relay 521 operates it blocks and closes a circuit to operate relay 419. Relay 419 blocks and opens the control earth circuit for relay 521, which prepares a path for relay 1020 to operate and earth connects the / from contact 3 of relay 1000 through contact 1 of relay 419 to the earthquake generator circuit.

  <Desc / Clms Page number 78>

 impulses. The direction relay combines the outgoing pulse relays 400, 401, 406, and 408 of the incoming recorder-sender with the first recorder relay to transmit pulses to the out-going recorder-sender. , such as for example the first horizontal row of recorders shown in FIG. He.



   The common outward impulse relays 400,401, 406 and 408 are associated with all direction relays and recorder relays, they are used to translate the combinations as they are recorded into earth pulses and 48 volt high and low resistance battery through leads 843, and 844 to operate relays in the outgoing recorder-send circuit.

   The combinations of relays and pulses transmitted for different digits are as follows:
 EMI78.1
 
 <tb> misse <SEP> in
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> NUMBER <SEP> walk
 <tb>
 <tb>
 <tb>: <SEP> 0 <SEP>: <SEP> 1 <SEP>: <SEP> 2 <SEP>: <SEP> 3 <SEP>: <SEP> 4 <SEP>: <SEP> 5 <SEP>: <SEP> 6 <SEP>: <SEP> 7 <SEP>: <SEP> 8 <SEP>: <SEP> 9 <SEP>:
 <tb>
 <tb>
 <tb>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> J <SEP>: <SEP> M <SEP>: <SEP> R <SEP>: <SEP>: <SEP> W <SEP>:
 <tb>
 <tb>
 <tb> Drivers: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>
 <tb>
 <tb>
 <tb>
 <tb> of pulses <SEP> 843 <SEP> L + <SEP>: <SEP> H +: L- <SEP>: <SEP> H- <SEP>: <SEP> L + <SEP>: <SEP> L + <SEP>: <SEP> H +: <SEP> L- <SEP> H- <SEP> L + <SEP>:

    <SEP> H +
 <tb>
 <tb>
 <tb>
 <tb> Driver
 <tb>
 <tb>
 <tb> transmission <SEP> 844 <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> L- <SEP>: <SEP> H + <SEP>: <SEP> H + <SEP>: <SEP> H + <SEP>. <SEP> He ° <SEP>: <SEP> h-: <SEP> L-
 <tb>
 <tb>
 <tb> Relay <SEP> First <SEP>: <SEP> X <SEP>: <SEP>: <SEP> X <SEP>: <SEP>: <SEP>: <SEP> X <SEP>: <SEP> X <SEP> X
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> of record <SEP> Second <SEP>: <SEP>: <SEP>: <SEP> X <SEP>: <SEP> X <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> X <SEP>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> manager <SEP> Third:
 <tb>
 <tb>
 <tb> me <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> X <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> X <SEP> X
 <tb>
 <tb>
 <tb> Fourth- <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>:
 <tb> me <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>:

    <SEP> X <SEP> X <SEP>: <SEP> X <SEP> X <SEP> X
 <tb>
 H + indicates low resistance earth.



  H- indicates a 48 volt low resistance battery.



  L + indicates a high resistance earth, L- indicates a 48 volt high resistance battery, X indicates an actuated relay.

  <Desc / Clms Page number 79>

 



   Relay 1015 is a non-biased relay (as to the direction of the current) time-regulated by capacitor and biased in that the direction of movement taken by the armature depends on the direction of the current. It cannot be said to be working or falling, but it closes its anterior contact when it is excited in one direction by its primary winding or closes its posterior contact when it is excited in the opposite direction by its primary winding. It can also remain on one or the other of its contacts or on none, when it is not excited. When the current first passes through the primary winding in either direction, its force is neutralized by an opposing current in the secondary winding. The source of the opposing current is the charge or discharge from the counting capacitor 1027.

   When the capacitor has been charged or discharged, current stops flowing through the secondary link-bearing. The primary winding then causes the armature to move from one contact to another. The runtime averages approximately 0.065 seconds per single operation. When the relay 1015 closes its previous contact, the relay 1021, being actuated, it bypasses the 300 ohm battery associated therewith and generates opposing currents in the two windings. When this state is created, the action of the secondary winding is stronger and the front contact is kept closed, but when the capacitor discharges its current, the value of the current in the secondary winding decreases until the action of the primary winding becomes stronger.



  The relay then breaks its previous contact and closes its posterior contact. When the relay contact is in this position, the battery through the 300 ohm resistor 1017 draws current through both windings in directions which are the reverse directions of those previously established. When the circuit is in this state, the value in the secondary winding is higher first and the posterior contact

  <Desc / Clms Page number 80>

 is now closed. The capacitor is now charged, which decreases the current in the secondary winding until the value in the primary winding becomes larger than the value in the secondary winding. The relay then counts its posterior contact and closes a previous contact. cycle continues in successive order.



   The pulse generator circula consists of the pulse start relay 1021 and the pulse generator relays 1015 and 1020. By emitting pulses, relay 1015 operates as previously described, with relay 1020 operating each time. that relay 1015 closes its rear contact. The pulsation should start when the counting capacitor 1027 is discharged and when the relays 1015 and 1020 are in a defined state, 1015 having its rear contact closed and 1020 should be actuated. This is accomplished by discharging the capacitor when the battery is applied to the resistor when a recorder-sender is gripped.

   Relay 1015 closes its side contact immediately after relay 419 is actuated and causes relay 1020 to operate. When operating, relay 1020 extends conductors 843 and 844 to relay 1021 which extends these conductors to external pulse relays. 400, 401, 406 and 408. Relay 1021 opens a path to bypass its own winding and closes a conductor from earth to the previous contact of redo 1020 to advance the direction relays and initiates continuous pulses from relays 1015 and 1020.



   The outward pulse relays 400, 401, 406 and 408 are now activated for the first pulse from the digital recorder shown in the upper horizontal row in Fig. 16. And the contacts of these relays connect a high or low resistance battery or earth to conductors 843 and 844 when the relay

  <Desc / Clms Page number 81>

 1020 is actuated. At the same time, the steering driver from relay 1020 actuates the immediately next steering relay associated with the next set of recorder relays.

   When relay 1020 drops out, the immediately following steering relay operates as previously described in series with the upper steering relay, thereby releasing the previous relay used for transmission from the first set of recorder relays, ! Cursing the pulse open period, relays 400, 401, 406 and 408 take their position for transmission of the next digit.The pulses continue in this manner until the pulse relays recognize a signal indicating that the pulses have been transmitted to the outgoing recorder-sender.

   This signal can be transmitted, the relays 400 and 406 being actuated.



  A circuit is established for the operation of the final pulse relay 1007 which locks and operates by synchronizing the relay 1008. When the pulse relay 1015 operates as a result of the transmission of the final pulse, its Pulse circuit passing through its previous contact is open at the contact of relay 1008, and therefore capacitor 1027 will remain charged and relay 1015 will cease pulsing.



   When the denart recorder-sender receives the final pulse, it establishes a circuit as explained later to actuate bias relays 1013 and 1094 associated with the pulse leads of the incoming recorder-sender. When these two relays are actuated, a circuit is established to operate relay 1012 which locks up and connects earth to the outgoing recorder-sender through conductor 843. The out-going recorder-sender, as described later in detail opens both pulse conductors, which results in the release

  <Desc / Clms Page number 82>

 ment of relays 1013 and 1014. On falling, relay 1014 actuates relay 424 indicating that the outgoing recorder-sender has accepted the signal of the final pulse.



   RECORDED IN THE OUTPUT RECORDER-SENDER.



   -------------------------------------------------- ----
The pulses transmitted from the incoming recorder-sender are recorded by the outgoing recorder-sender as outlined in the following description. After the operation of the loop system relay 2100 as shown above a circuit is established for the relays 1600 and 1601 controlling a succession of steering relays. This circuit includes: battery, winding of relay 1600, winding of relay 1601, contact 1 of relay 1609, contact 2 of relay 2100, contact 3 of normal relay 2024, contact 2 of actuated relay 2025 , contact 2 of relay 1505 and earth.



  The 1600 and 1601 relays close the pulse recording conductors from the 2011, 2012, 2007 and 2008 relays to the 1602, 1603, 1604 and 1605 recorder relays. The 1600 relay is blocked by its contact 2 to earth applied to contact 2 of relay 1505 and establishes a control circuit for relay 2024 as previously described. As previously established, relays 1600 and 1601 are maintained after operation independent of relay 2024, so as to prevent them from operating again after they have been de-energized by the directional relay immediately following the press to store digits.



   When the incoming recorder-sender closes the pulse circuit, circuits are established from the 48-volt battery to ground through the high or low resistors that are connected to the out-going recorder-transmitter. by conductors 1534 and 1535 actuating the pulse relays according to a table given below.

  <Desc / Clms Page number 83>

 



  These relays actuate the recorder relays also according to the table given below.
 EMI83.1
 
 <tb> key <SEP> 'Stake
 <tb>
 
 EMI83.2
 ###!###!###!###:###:###:###:###:###-- :in . 0: 1. 2 ... 3 4 5d 6m 7R 8 'che; mar- 1d sji 6roi 7Î 9Î
 EMI83.3
 
 <tb> Driver <SEP> 1535 <SEP> L + <SEP> H + <SEP> L- <SEP> H- <SEP> L + <SEP> L + <SEP> H + <SEP> L- <SEP> H- <SEP> L + <SEP> H +
 <tb>
 <tb>
 <tb>
 <tb> 1534 <SEP>: <SEP>: <SEP>: <SEP>: <SEP> L- <SEP>: <SEP> H + <SEP> H + <SEP> h + <SEP> H + <SEP>: <SEP> H- <SEP> L-
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> Relay <SEP> 2010 <SEP>: <SEP> V <SEP>. <SEP> V <SEP>. <SEP> V <SEP> V <SEP> V <SEP> V <SEP> V <SEP>. <SEP> V <SEP>. <SEP> V <SEP>. <SEP> V <SEP>. <SEP> V
 <tb>
 <tb>
 <tb>
 im- <tb> <SEP> 2006 <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>:

    <SEP> V <SEP> V <SEP> V <SEP> V <SEP>. <SEP> V <SEP>. <SEP> V
 <tb>
 <tb>
 <tb>
 <tb> pul- <SEP> 2012 <SEP> or
 <tb>
 <tb>
 <tb>
 <tb> sion <SEP> 2013 <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP> V <SEP> V
 <tb>
 <tb>
 <tb>
 <tb> 2008 <SEP> where
 <tb>
 <tb>
 <tb>
 <tb> 2009 <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V <SEP> V <SEP> V <SEP> V
 <tb>
 <tb>
 <tb> 2011 <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V <SEP> V <SEP> V
 <tb>
 <tb>
 <tb>
 <tb> 2077 <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> elais <SEP> First <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP>:

    <SEP> V <SEP> V
 <tb>
 <tb>
 <tb>
 <tb> 'en- <SEP> Second <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V <SEP> V <SEP> V
 <tb>
 <tb>
 <tb>
 <tb> egis- <SEP> Third <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V
 <tb>
 <tb>
 <tb> reur <SEP> Fourth <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> V <SEP>: <SEP> V <SEP> V <SEP>: <SEP> V <SEP> V
 <tb>
 H + indicates a low resistance earth, 'H- indicates a 48 volt low resistance battery, L + indicates a high resistance earth L- indicates a 48 volt high resistance battery V indicates an actuated relay.



   As previously assumed, the number 1379 is given as an example of recording. Closing digital pulse 1 in the arrival recorder-sender will connect low resistance earth to conductor 1534 and actuate relays 2010 and 2012. When actuated, relay 2010 actuates the next one. steering relay after relay 1600. This relay is in a chain, and we can assume that it is the same as relay 1608. A steering relay such as 1609 does not work at this time since it is shorted by the contacts of the previous steering relay. The re-

  <Desc / Clms Page number 84>

 lais 1220 activates the recorder relay 1602 which locks to the earth applied to contact 2 of relay 1505.



  When the pulse is no longer on the pulse conductor, the 2010 and 2012 relays drop out. On falling, relay 2010 removes the short circuit of a steering relay, such as relay 1609, allowing it to operate in series with a steering relay such as 1608.



  When this relay, such as 1609, is actuated, it opens the blocking circuit for relays 1600 and 1601 which drop. The relay, such as 1609, also closes the leads from the 2006, 2013 pulse relay contacts, connecting them to the second horizontal row of recorder relays. When relay 1600 drops out, it closes the conductors from the contacts of the 2006 and 2010 relays to the steering relays, such as 1608. When the relay drops out, the 1601 relay opens the conductors from the contacts of the pulse relays extending to the first horizontal row of recorder relays.



  Closing pulse 3 in the incoming recorder-sender connects the low-resistance battery to conductor 1534, which causes pulse relays 2010, 2011 and 2012 to operate. Recordings are made in this manner until the digital recorders of the outgoing recorder-sender are set in accordance with the pulses transmitted from the inbound recorder-sender.

   When the incoming recorder-sender has finished transmitting the pulses, a special pulse from a low resistance earth is sent to lead 1534 and a 48 volt high resistance battery is connected to lead 1534 to signal the receiver. The outgoing recorder-sender pulses to tune the outgoing recorder-sender registers have all been transmitted.



  This special impulse activates the relays 2010, 2006,

  <Desc / Clms Page number 85>

 2012 and 2007. When operating, this latter relay establishes a circuit for relay 2022. This relay is connected to the contacts of relays 2012 and 2007, so that operation of both relays establishes a circuit for relay 2022. When operating, the relay 2022 establishes a circuit to actuate relay 2023 which locks to the earth applied to contact 1 of relay 1505. When the special pulse is transmitted, relay 2022 drops out, which now establishes a circuit to operate the relay. start relay 1520 in order to send pulses to the outside from the outgoing recorder-sender -car the conductors of the junction to a remote office.



   While operating, relay 1520 establishes a circuit to actuate relay 1506, which causes relay 1515 to drop, which, it will be recalled, was actuated as a pulse receive signal to the outgoing recorder-sender. . Relay 1506 also connects the windings of relays 2027 and 2028 to pulse leads 1534 and 1535. This establishes circuits for polarized relays 1013 and 1014 in the arrival recorder-sender, as explained previously. to indicate to the incoming recorder-sender that the final pulse signal has been properly received by the out-going recorder-sender. Relays 2027 and 2028 in the output logger are marginal and do not function in this case.

   The polarized relays in the incoming recorder-sender operate and transmit a signal to the out-going recorder-sender. This is a direct earth signal passing through conductors 1535 and 1534, actuating relays 2027 and 2028, which establishes a circuit for relay 1507. Relay 1507 taps and locks up under control of relay 1520, thereby. releasing relay 1506. When releasing, relay 1506 opens impulse conductors 1534 and 1535 from relays 2027 and
1

  <Desc / Clms Page number 86>

 2028, bringing these down. The incoming recorder-sender pulse equipment is now disconnected from pulse leads 1534 and 1535.



     PULSES TO THE OUTSIDE TO THE REMOTE OFFICE ----------------------------------------
The pulses of the loop system are now transmitted through conductors 1530 and 1531, a pulse circuit which includes: secondary and primary coupling switches 823 and 801, conductors 360 and 361, contacts 1 and 2 of relay 321, the tip and @@ mark conductors from the outgoing junction extending to telephone office 330. As previously established, relay 2100 is actuated for loop dialing by an inter-city switching junction or by a trunk junction, and therefore relay 2115 operates from battery and earth on the outgoing junction conductors.

   Relay 2115 operates relay 2114, which operates relay 1606. While operating, relay 1606 establishes a control circuit for relay 2019 which opens the shunt of relay 1607, causing it to operate. This establishes a circuit for Relay 2014 that operates and connects earth to Relay 2017 to cause its operation and initiate selections and pulses to the remote office. While operating, relay 2017 also establishes a circuit to actuate relay 2016. When operating, relay 2017 removes the earth previously applied to the winding of relay 2120 which is connected in a network intended to actuate and drop this relay. relay in this network regulated as to time. Relays 2118 and 2119 are in series with relay 2120 which operates and falls in unison with relay 2120.

   When it is originally activated, the 2019 relay activates the 2112 relay and when it drops,

  <Desc / Clms Page number 87>

 it establishes a control circuit for relay 2111. When operating relay 2120 activates relays 2119 and 2118 again. When operating, relay 2119 activates relay 2117 and also one of the common relays 2146, 2144, 2142, 2140 , 2138.

   In operation, relay 2107 arranged the contacts of relays 2118 so that relays 2115 and 2116 were removed from the pulse circuit. If it is assumed that relay 2142 was actuated when relay 2119 was originally actuated, re Releasing and successive operation of relay 2119 will cause relay 2141 to operate and then relay 2144 and 2143 eventually actuating relays 2146 and 2145.

   While operating, relay 2145 prepares a circuit route for relay 2105 to operate as soon as relay 2119 operates again, thereby removing the contacts of relay 2118 from the pulse circuit, so that the operation and subsequent release of the relay. relays 21-18 will not affect the conductive relays of the junction. Relays 2115 and 2116 are also connected between pulse conductors 1530 and 1531.



   After relay 2145 has operated, relay 2119 operating and falling the next time, actuates relays 2127 and 2130, and therefore actuates relays 2126 and 2129. Relay 2129 drops relay 2107. It will be noted at this time that the operation of each pair of relays 2144 and 2143, 2146 and 2145, up to 2126 and 2129, causes the previous pair of relays to drop. Operation of relays 2129 transfers the forward contacts of relay 2119 from relay 2130 to relay 2145, so that when operating the next time, relay 2119 will cause relay 2112 to operate again, and on de-energizing, relay 2119 will operate the relay. 2111.

   When operating, relay 2130 drops the re-

  <Desc / Clms Page number 88>

 The 2109 relay and the 2129 relay kept the release of the 2109 relay running. When the 2111 relay operated for the second time, and when the 2119 relay operates again, then the 2107 relay does not operate but the 2142 relay operates. On falling, relay 2119 causes relay 2141 to operate. Relay 2119 has operated and dropped successively activates pairs of relays 2144 and 2143, 2146 and 2145, 214 and 2128, which opens the circuit from the contact of relay 2119.



  After the pulses for the last digit have been completely transmitted, relays 2115 and 2116 are connected between the conductors of the outgoing junction.



  This circuit includes: conductor 1530, contact 1 of relay 2117, winding of relay 2116, winding of relay 2115, contact 4 of relay 2100, contact 2 of relay 2105, contact 1 of relay 2107, relay contact 2 2117 and conductor 1531. It will be recalled that conductors 1530 and 1531 are connected to the conductors of the junction extending to the remote office 330.



  Relay 2115 establishes a circuit to actuate relay 2103, assuming relay 2118 is actuated, which is the case if the special pulse has been received.



  This special pulse can be received in any digit position and consists of a combination that operates the first and third logger relays of any given logger, when relay 2020 is operating to operate any of relays 1606, 1607 through. 1614, 1615 associated with particular recorder relays.



  As previously established, relay 2018 operates from the established circuit and establishes a circuit to operate relay 1512. This latter relay opens conductor 1533, causing the relay of outgoing junction 306 to release, resulting in at the outgoing junction the connection signal, or when a repeater is required,

  <Desc / Clms Page number 89>

 to choose a repeater to be inserted in the conversation conductors. The opening of the conductor 1533 causes the relay of the output recorder-sender 1509 to drop again, which successively drops the relays of the output recorder-sender.



   Repeater selection.



   ---------------------
The condition of the equipment in the outgoing junction can be re-examined at this time, Fig. 3, before establishing circuits therein for the selection of a repeater. Relay 319 was actuated, when the outgoing junction was selected and was locked in position or kept actuated by conductor 204 extending through switches from the incoming junction. A circuit for relay 320 was established by the outgoing recorder-sender and this relay was blocked to ground on relay 319. Relay 306 was actuated by the out-going recorder-sender for transmission of pulses and a was now de-energized by the outgoing recorder-sender, since those pulses have been transmitted.

   Relay 305 was actuated by a circuit established from the outgoing recorder-sender on the line conductors after relay 306 had operated and was blocked at contact 1 of relay 320. Repeater relay 322 was actuated by the marker and blocked. to earth applied to contact 4 of relay 319. Circuit is thus established to effect a transfer of control to the circuits of the repeater select coupling. This is done by the operation of the relay 321 from the battery, by the winding of this relay, the contact 9 of the relay 305, the contact 7 of the relay 306 and the earth applied to the contact 6 of the relay 305.

   Relay 321 later establishes a blocking circuit for itself by its releasing contact 4.Next, relay 306 also establishes a setting circuit.

  <Desc / Clms Page number 90>

 on for the coupling which associates a coupling control circuit for the selection of a free repeater. This start-up circuit includes: the control earth for relay 321 on contact g of relay 305, contact 7 of relay 306, contact 3 of repeater relay 322, conductor 331, contact 1 of relay 1310 of the coupling circuit, the winding of the coupling start relay 1311 and the battery.

   It will be recalled that this start lead 331 was also used to energize the coupling start relay 1311 for the selection of a coupling control circuit which associated the start recorder-sender with the circuit of the outgoing junction and the incoming recorder-sender. This switch-on relay would drop, however, as soon as the outgoing recorder-sender was selected, so that the coupling control circuit and the coupling connector could be used to make other connections. At this time, the control circuit was opened by energizing relay 320, which dissociated the start earth from the start relay 1311.



   In operation, the coupling switch-on relay @@ 1311 establishes circuits as explained here when entering the incoming recorder-sender and an outgoing recorder-sender which selects as a back-up circuit. free order, Figs. 17, le, 19, 22, 23 and 24. This is accomplished by the operation of selector relays shown in the upper part of FIG. 12 and the operation of multiple contact relays 1206 and 1207, also as previously described.

   After a series of operations in the coupling control circuit to determine the group in which the outgoing junction of FIG. 3 is located, relay 1314 is activated to associate the conductors of this group with the control circuit.

  <Desc / Clms Page number 91>

 de via multiple contact relays 1206 and 1207, also as described above. The outgoing junction conductors are thus connected to the chosen free coupling control circuit, via the contacts of relay 1314. These conductors include category conductors 334 and 332, which in this case are connected together by relay 320 to direct the control circuit to choose a free repeater.

   It will be recalled that the conductors 334 and 333 were connected together by the contacts of the normal relay 320 to actuate a category relay in the coupling control circuit which directed the control circuit in order to choose a recorder. free starting sender. With relay 320 actuated by the outgoing recorder-sender, category conductors 334 and 332 are now connected to energize category relay 2210.

   This circuit includes: the battery, the winding of the relay 2210, the conductor 1235, the contacts of the relays 1207 and 1206, the contact 14 of the relay 1314, the conductor 752, the conductor 332, the contact 4 of the relay 320, conductor 334, contact 11 of relay 1314, contacts of relays 1206 and 1207, conductor 1232, contact 7 of rela.is 1706, which in this case is activated, contact 7 of relay 1710, which is normal, contact 2 of relay 1711, contact 2 of relay 2303 and earth. Each junction has an individual class conductor, such as 334, which must be extended by a relay in the coupling control circuit, such as 1706, sized to indicate the position of the junction in a subgroup of junctions.

   Relay 1706 was also actuated for this same junction for the selection of an outgoing recorder-sender to associate with this junction, as previously described. For the selection of an outgoing recorder-sender, it will be remembered that the relay

  <Desc / Clms Page number 92>

 category 804 was activated, while in this case for the selection of a repeater, the category 2210 relay is activated. In operation, this category relay establishes a circuit for relay 1332 to associate a large number of repeater circuits, as shown in Fig. 14, to the control circuit.

   The circuit for relay 1332 includes: earth, the winding of this relals, contact 18 of relay 1314, contacts of relays 1206 and 1207, conductor 1239, contact 6 of relay 1709, which is actuated, contact 1 of relay 2210 activated, contact 1 of relay 1806 normal, contact 1 of relay 1804 normal, contact 4 of relay 2304 normal, contact 9 of relay 2402 normal. and the battery. In operation, relay 1332 connects a number of test leads from a number of repeaters to the coupling control circuit. Only one such conductor is shown connected through contact 1 of relay 1332 to test lead 1442 of the repeater through the contact of jack 1413, contact 1 of relay 1414 to ground applied to relay 1418.

   This state indicates a free repeater circuit. When a repeater circuit is busy, that conductor is open. Note that the repeater circuit relay 1418 is normally actuated from the battery by its ground winding applied to contact 6 of relay 1414. When the repeater becomes busy, relay 1414 is actuated, as described below. which causes relay 1418 to drop, disconnecting the earth applied to contact 3 of the test lead. All repeaters where ground is connected to conductor 1442 extend through the contacts of relay 1332 to the windings of relays such as 2202, 2204 and 2206 in the same manner as described for the logger, inbound sender and the logger -sender of.; outgoing.

   Therefore, the selection of a free repeater is performed in the same way as previously described.

  <Desc / Clms Page number 93>

 and the location of a secondary coupling switch level to which this free repeater is connected is obtained by circuits established by the relay in the control circuit which is actuated by this test lead. Relay 1324 is therefore actuated according to the level on which the free repeater was found.

   The circuit for relay 1324 includes: earth, the winding of this relay, contact 39 of relay 1206, a corresponding contact on relay 1207, conductor 1259, contact 3 of relay 2209 which is actuated, contact 3 of relay 1810, which was actuated to indicate the level of the switch, contact 2 of relay 1809 normal, contact 2 of relay 1805 normal, contact 5 of relay 1805, contact 5 of relay 1809, contact 5 of relay 1810 , the 1820 resistor and the battery. In operation, relay 1324 associates earth through its contact 4 with the control circuit to actuate the double test relay 1901. This energizes circuits as described in the selection of the incoming recorder-sender and a double Free repeater circuit test is performed to prevent & double connection.

   Contact 1 of relay 1324 is connected to conductor 1443 of the repeater circuit which extends through the lower contact of jack 1413 to the battery through resistor 1415.



  If there is no double connection, the test is completed by energizing tube 2410, in the coupling control circuit, and circuits are established to energize the selection electromagnets and the switching electromagnets. maintaining the primary and secondary switch to which this repeater is free. It can be assumed that the switch 826 is the horizontal level of the secondary coupling switch to which the free repeater is connected and is under the control of the selection electromagnet 827 and the holding electromagnet 823. The bridge or vertical primary coupling switch through which the

  <Desc / Clms Page number 94>

 whoopee is connected to the outgoing junction is the switch level 800 under the control of the selector electromagnet 803 and the holding electromagnet 808.



  Circuits are established for these selector electromagnets and holding electromagnets in the same manner as previously described, which now connects the repeater circuit, FIG. 14, through the corresponding contacts of the secondary coupling switch 826, the primary coupling switch 800 at the outgoing junction, FIG. 3. The earth associating the maintenance electromagnets 828 and 808 also extends through contact 3 of switch 826 to the battery through the winding of relay 1414, actuating this latter relay. When operating, this relay opens the circuit of earth connected to conductor 1442 and connects earth to conductor 1443, making this repeater busy for other coupling control circuits.

   This conductor also extends to conductor 359 in the outgoing junction circuit. This completes the function of the coupling control circuit with respect to the selection of the repeater and the extension of the conductors of that repeater to the outgoing trunk circuit, so that the repeater can be inserted into them. conversation leads. The control circuit can, therefore, be released as soon as the start circuit extending from the outgoing junction circuit is opened, which occurs as soon as the relay 308 is actuated.



   Entering the repeater circuit and associating this repeater with the outgoing junction circuit establish circuits in the repeater which, as established, actuate relay 1414 and at the same time energize relay 1416. Relay 1416 is energized. by contact 2 of relay 1418 and the winding of relay 1416 to the battery. Circuit for relay 1418 is open

  <Desc / Clms Page number 95>

 via contact 6 of relay 1414 but relay 1418 is a delayed release relay and gives relay 1416 sufficient time to operate. A potentiometer circuit is established through contact 5 of relay 1414, consisting of resistor 1420 and resistor 1421 to ground.

   The earth, to energize relay 1416, extends from contact 4 on relay 319 of the outgoing junction through contact 8 of relay 321, conductor 350, contact 12 of primary switch 800, contact 12 of the switch. - secondary stator 826, conductor 1441 to the winding of relay 1416, as described, earth also extends to contact 3 of relay 1414, returning to the outgoing junction circuit through conductor 1435, contact 6 of the coupling switch secondary 826, the contact 6 of the primary coupling switch 800, the conductor 356, the contact 6 of the relay 321, the winding of the relay 308 to the battery, actuating the latter relay.

   On operation, this latter relay opens the blocking circuit for the repeater relay 322 which now drops out and opens the turn-on circuit for the coupling control circuit which now returns to idle as previously described. Relay 1416 locks to ground in the outgoing junction circuit through conductor 1441 as described. The circuit through relay 1400 extends through the switches to conductor 353, through contact 7 of relay 321, contact 6 of relay 308 to delay coil 307. This circuit is used to switch on the relay. repeater independently of the artificial balancing circuit or the insertion of the artificial balancing circuit in the repeater circuit.

   Repeaters 1411 and 1412 are inserted into the telephone link by the operation of relay 308 which now remains actuated for completion of

  <Desc / Clms Page number 96>

 the call. The repeaters conductors between the outgoing junction and repeaters passing through the coupling switches are all obvious and do not need to be described.



   BILATERAL JUNCTION AS EXIT JUNCTION.



   -------------------------------------------
When the bilateral junction, Figs. 1 and 7, is entered by a marker and used as the outgoing trunk, circuits can be set up to select an outgoing logger-sender and repeater as described for the outgoing trunk in FIG. 3. When this junction is captured by the marker to be used as an outgoing junction, relay 722 is actuated in the manner described to operate relay 319.



   In this case, the marker tests the junction through conductor 750 and, if this junction is free, the marker actuates relay 722. When operating, relay 722 establishes an excitation circuit for relay 716 and the relay. relay 716 connects the earth to the start conductor 751 to energize the coupling by activating the relay 1311. The start conductor comprises: earth, contact 6 of relay 716, contact 5 of relay 709, conductor 751, contact 2 of relay 1310, the winding of the start relay 1311 and the battery. Operating relay 722 also establishes the category circuit to direct the recorder-coupling control circuit to select an output / sender in the manner previously described for selecting an output recorder-sender.

   For this direction signal, conductor 755 is connected to conductor 754 through contact 9 of relay 722 which, as previously described, operates category relay 1804 in the coupling control circuit.



   If the marker automatically determines from the type of the calling terminating junction and from

  <Desc / Clms Page number 97>

 Depending on the type of the outgoing junction employed for the connection a repeater is required, a signal is transmitted from the marker to the outgoing junction in the manner previously described for the transmission of that signal through the outgoing junction of FIG. 3. In this case, a signal is transmitted to the bilateral junction of FIG. 1 to actuate the repeater relay 101, in the circuit of the junction.

   This signal is transmitted through the tip and neck conductors in the same manner as described earlier in and between the junction circuits through the upper and lower windings of the relay coil 103 going to earth through the left and right windings of relay 703, contact 3 of relay 722, contact 3 of relay 107, contact 10 of relay 707, contact 11 of relay 104, contact 3 of relay 102 and the lower winding relay 101. Repeater relay 101 locks in its actuated position and waits for the selection of the outgoing recorder-sender, after which relay 105 is actuated to associate a repeater with the junction.



  The coupling turn-on circuit is energized again for the selection of this repeater. This circuit passes through conductor 751, which in this case extends to earth from the contact of relay 106 since, as previously described, relay 709 is actuated during operation of the associated output recorder-sender. to the circuits of the outgoing junction. The category registration for directing the coupling control circuit is also changed, since in this case conductor 755 is connected to conductor 752 to direct the coupling control circuit to select the repeater. This connection is made by contact 3 of relay 106.

   A repeater is therefore chosen and the coupling switches are therefore actuated-to connect this repeater to the conduc-

  <Desc / Clms Page number 98>

 Talkers as described for the outgoing trunk in Fig. 3. This bilateral jolction is therefore arranged to transmit three different categories of signals to a coupling control circuit in order to direct the control circuit to choose an incoming recorder-sender, an outgoing recorder-sender. or a repeater which all are connected by the same contacts of the primary coupling switch connected to the junction, each connection was made by different corresponding contacts on different bridges or verticals of the switch,

   these bridges being associated with different choices of secondary coupling switches. In some cases, the choice of the secondary switch to choose an inbound recorder-sender may be the same as to choose an outbound recorder-sender since the inbound recorder-senders and outbound recorder-senders or " repeaters can be connected at different horizontal levels of the same secondary switch Various choices in the switch are available by the bridges of the secondary switches associated with the bridges of the primary coupling switch.



   CLAIMS --------------
1. Telephone system comprising an automatically switched telephone office, inbound trunks, outbound trunks various kinds of equipment, a coupling having a primary switch connected to one and a number of incoming trunks / outgoing trunks, and secondary switches having access to a number of different equipment spaces and coupling control circuits, characterized in that it comprises a device in a junction circuit for transmitting successive signals to the coupling and to the control circuit of coupling in order to direct the selection success-

  <Desc / Clms Page number 99>

 sive of different species of equipment, a device in the coupling circuit responding to these signals for,

   to successively associate therewith a free coupling control circuit, a first device in the coupling control circuit responding to the signals to successively choose the) different species of equipment, and a second device in the coupling control circuit to actuate the secondary and primary coupling switches in order to associate the different types of equipment with the signaling junction via the coupling switch contacts.



     2. Telephone system according to claim 1, characterized in that the different species of equipment include a number of both incoming recorders-senders outgoing recorders-senders and repeaters, the device in the circuit. of the trunk answering an incoming call.



   3. Telephone system according to claims 1 and 2, characterized in that the first device in the coupling control circuit selects with discrimination an incoming recorder-sender, an outgoing recorder-sender or a repeater following the direct. / ives given by the junction circuit signals.



   4. Telephone system according to claim 3, characterized in that the first device simultaneously tests a large number of the particular species of equipment to which it is directed by choosing only one free from this number.



   5. Telephone system according to any one of the preceding claims, characterized in that the second device in the coupling control circuit is actuated, upon connection of the chosen equipment space, to the secondary coupling switch. .



   6. Telephone system according to any of the

  <Desc / Clms Page number 100>

 preceding claims, characterized in that the signals coming from the circuit of the junction desire the sequence according to which different species of equipment will be chosen.



   7. A telephone system according to claim 2 and any one of claims 3 to 6, characterized in that the first device comprises a marker capable of being variably actuated, comprising individual route relays for the different. junctions, the marker actuating the particular feeder relays depending on the signals, a device responding to the operation of a feeder relay to determine whether a repeater should be chosen for an outgoing junction and to choose a free outgoing junction , and a device responsive to the determining device for choosing a free repeater for this outgoing junction in the event that a re-oeter must be chosen.



   8. Telephone system according to claim 7, characterized in that the marker comprises recorders which are set to control the selection of the outgoing junction, the feeder relays responding, in an operative manner, to the setting of the recorders. .



   9. Telephone system according to claims 1 to 8, characterized in that the circuit of the junction transmitting the signals is an incoming junction, the control circuit of the council choosing a free incoming recorder-sender and causing the connection of The recorder-sender at the incoming junction by the operation of the secondary and primary coupler switches through corresponding contacts, the incoming recorder-sender comprising recorders set for the signals, the recorders in the free marker chosen by the recorder-sending device being set according to the sending recorders,

     an available

  <Desc / Clms Page number 101>

 sitive being provided in the outgoing junction to transmit successive signals to the coupling circuit in order to direct the selection of an outgoing recorder-sender and a repeater if this is justified, the secondary switches and the primary switch being successively actuated to connect by corresponding contacts this outgoing recorder-sender and this repeater to the outgoing junction, an additional device being provided in the incoming recorder-sender responding to the selection of an outgoing recorder-sender to transmit digit pulses from the recorders of the incoming sending recorder to the outgoing recorder-sending recorders by means of coupling switches,

   and a device being provided in the outgoing register-sender, responsive to a signal from the incoming register-sender, to re-tune the circuit of the outgoing junction and to transmit digit pulses on the outgoing junction to a remote office, the device determining the selection of a repeater responsive to a signal from the outgoing recorder-sender.