BE351681A - - Google Patents

Description

       

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  Telephone installation.



   The present invention relates to telephone installations in general and semi-automatic telephone installations in particular, without, however, being specifically limited to them.

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   The main object of the invention is to create new and improved circuit arrangements by which connections between hand-serviced lines arriving at a power plant can be established by means of automatic selectors under the control of a supervisor. a distribution board in a remote power plant.



   Another object of the invention is to provide this service in a terminal line plant of the magneto type with local battery, without modifying in any way the condition in which the magneto lines operate, when they terminate in distribution boards. magneto manuals of the usual type.



   The invention is especially suited to application to a cluster of small villages and rural population centers, in which case several semi-automatic magneto power stations can each be connected by one or more connection lines with a monitoring center which is usually located in a town located in the center of the region served by the various semi-automatic magneto power stations.



   The application of the invention to an installation containing a semi-automatic magnetic unit will be described below. to which terminate less than one hundred lines, this station being connected by a single line from odnnexiortaveo to the main central EU, the calls made being automatically signaled to the supervisor by way of this line and the supervisor putting the automatic selectors into operation by the route of this line to complete desired local connections.

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   In order to provide for the establishment of connections from the semi-automatic h magneto control unit to other control units, or the establishment of connections in the opposite direction, one or more connection lines can be provided, in addition to the service line, between the main control unit and the semi-automatic magneto control unit, which will be called in the following for more convenience SAMX



   The invention further provides suitable circuit arrangements, whereby the input of a connector into the
S.A.M.X. and releasing the connector, when it has been actuated under the control of the supervisor, is effected in response to the initial ringing and final ringing of a subscriber of a magneto calling device. It will therefore be understood that a connector, after having been seized by an individual line selector in response to the operation on the calling subscriber's call magneto, maintains the line selector locked in the operating position until when the connector is released, when the calling subscriber operates his 1-hand inductor again, after which he hangs up his receiver when the conversation is over.



   The invention further provides a searcher selector suitable for searching and connecting the service line with any connector which has been entered. A new finder selector of the relay type has therefore been provided in place of a gradually moving mechanism, in consideration of the fact that the finder must operate once for each call made, a selector of the relay type. having a duration of

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 life much more savings under a forced regime than a mechanism with gradual movement.



   The invention further provides arrangements whereby one of the two connection lines can be used if necessary as a service line, in the event that the service line is defective or broken.



   The invention further provides a standby maneuver group in the S.A.M. X. so that the supervisor can control the automatic selectors from this point, when all lines between the S. A.M.X. and the main power station are out of order, which can happen, for example, after a violent fall of hail or the like.



   In addition, suitable arrangements have been made for the power distribution board of the S.A.M.X. to bring the researcher associated with service line 1, connect the service line to the motive power distribution panel and give the supervisor a special signal in the event of an abnormal condition such as, for example, a circuit breaker is burnt or if the charging device is not functioning satisfactorily.



   Provision has further been made for automatically releasing a connection when it has been established for a predetermined length of time. This is in particular advantageous in view of the fact that the subscribers do not always ring the final bell when they have finished their conversation.



   In addition, suitable arrangements have been made whereby the supervisor 1 the main control unit can actuate one of the two main connectors to complete a connection

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 with any of the local connectors to determine whether it is in operation or not and to release the connector if it is in the operating position not in use.



   In addition, suitable circuit arrangements have been made whereby the supervisor can actuate a connector and its co-ordinated code selector to return the doorbell current through the calling line when the calling device is switched on. on the same line as the called device.



   An embodiment / object of the invention is shown, by way of example, in the accompanying drawing, in which:
Figs. 1 to 7 are connection diagrams and fig. 8 is a diagram showing the exact mode of assembly in figs. 1 to 7.



   Fig. 1 shows an OT / service line and two connection lines TT1 and TT2 connecting the manual station to the left (serving as the main control unit), the S.A.M.X. containing the equipment shown on the right of FIG. 1 and in figs. 2 to 7. It should be noted that part of the manual control unit equipment is placed on a remote distribution panel TB and another part on a local distribution panel LB.

   The remote panel monitor handles remote connections with the S.A.M.X. and the local switchboard monitor handles the local traffic and also monitors the connectors in the S.A.M.X. periodically to realize that they have not been left out of normal after being used. the equipment% right of fig. 1 is an apparatus of

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 Connection switching which is used if necessary to switch the operating circuit of the operating line to one of the remote connection lines in the event of a disturbance on the service line.



   Fig. 2 shows the relay type finder and its auxiliary equipment coordinated with the service line for connecting the service line to each local connector which is taken in use.



   Fig. 3 shows the first local connector LC1, 10 of these connectors being provided. This figure also shows device line A and the associated LS line selector, together with the MS main selector common to all line selectors. This figure also shows a TS time device assigned to the associated connector to limit the length of time during which the connector can remain in operation.



   Figure 4 shows the wipers and part of the field contacts of the local connector LC1 together with the selector code C1 assigned to each local connector HERE. This figure shows device B accessible to the connectors.



   Fig. 5 shows the first remote connector HERE in which the TT1 remote line ends. The contact field and the wipers of this remote connector are shown in fig '6, which also shows the CS2 code selector of each TC1 remote connector. This figure also shows the generator 1 code CG. This generator is a motor driven stool with a number of brushes and segments /

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 insulators and conductors as shown. The drum is drawn in development so that it can be understood more easily. This drum is driven by a rotational movement in the direction indicated by the arrow.



   Fig. 7 shows the driving force distribution board PB and the associated energy monitoring relays.



   The motive power distribution board contains the charging device and the two batteries used to power the S.A.M.X. Note that separate symbols are used for battery and earth in all drawings; the symbols for the land at S.A.M.X. indicate a connection with the 714 bus connected to the PB prime mover board ground and all battery symbols indicate a% connection. battery busbar 713.

   This figure also shows the reserve group
ETS in S.A.M.X. This group is planned so that a supervisor can be notified by S.A.M.X. to control the selectors of this reserve group in the event of a disturbance on the lines between the S.A.M.X. and the main power station.



   After this general description of the equipment, a detailed description of its operation will be given below. For this purpose, it will be assumed that the subscriber of apparatus A, fig. 1, wishes to have a conversation with the subscriber of device B, fig. 4.



   To notify supervisor 1 at the main central unit, the subscriber of device A operates his hand generator to generate the ringing current in his line, after which he picks up his receiver to be able to talk / with the supervisor

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 when the latter responds. In response to the ringing current, relay 302 is actuated and closes a circuit for slow acting relay 301. Relay 301 operates and closes a circuit through the pull winding of the row selector. This circuit contains the OMC Open main conductor which is common to all row selectors.



  The open main conductor passes through certain contacts in the main selector and receives its current through terminal 750. The two terminals 750 in figs. 3 and 7 are connected together and the current supply from the battery to the open main conductor takes place by winding up the monitoring relay 727, fig. 7, for a purpose which will be explained later. When the attraction coil 303 is energized, the line selector piston is brought into the field, and the interrupt armature is actuated to disconnect the bridged relay 302, the calling line.

   When the line switch contacts are closed after the piston has entered, a hold circuit is closed for the line selector interrupt winding 304 from the set release connection conductor. earth 376, this conductor being earthed to the contacts of relay 313. The effect of this circuit is to keep the line selector in operation after the slow-acting relay 301 has de-energized.

   As a further result of the piston entering the field, the line talk conductors are connected with the corresponding conductors of the local connector LC1, and the ground of the release connection conductor 376 is extended by the. line selector contacts to conductor 377 line selector retainer and motor selector test and by main elector wiper 343

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 for the top winding of the main selectar test relay 342. A circuit is also closed by the retaining conductor 377 for the relay 306 in the connector.

   Relay 306 now operates and closes a point in the chain relay 341 circuit of the main selector and connects the auxiliary test lead 378 IL to earth thereby closing a circuit for the lower winding of the test relay 342 in the selector. principal MS. The main selector test relay operates through each winding and causes the main selector to advance in the usual manner to pre-select another free connector. Weighing the advance of the main selector, the connection between the control unit battery and the open main conductor is held open in the usual manner.



   As a subsequent result of grounding the restraint conductor 377, the restraint relay 307 is actuated and opens at its upper inner frame a point in the circuit of the release magnet 321; another upper armature, it puts the local locking conductor 328 to earth; andat its lower armature, it closes a circuit for the relay 345 of the 5 minute time device TS for a purpose the details of which will be explained in the following. As a result of the grounding of the locking conductor 328, a circuit is closed by the upper inner armature of relay 318 for relay 319. Relay 319 is actuated and bypasses relay 319 for a purpose which will be explained later.



   As a further result of the operations of relay 307

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 the common start conductor 221 and the individual stop conductor 222. its two upper frames are earthed. As a result of grounding of the starter conductor, a circuit is closed for the starter relay 205, fig. 2, of the relay researcher. The relay 205 is actuated and puts its lower armature, the interlocking conductor 219 to earth, and with its upper armature, it connects the switch 217 which is earthed to the impulse conductor 218. This impulse conductor Normally extends through the contact chain shown at relay 213.

   It will be noted on this occasion that the pairs of relays corresponding to the connectors L02 to LC9 are omitted in the drawing and that they are in practice inserted in the circuit between the relays 209 and 210 at the point indicated by the dotted portion of the connection conductors. . As soon as the switch 217 closes, the relay 213 kicks in and locks itself by the relay 212 against the locking conductor 219. The relay 212 does not work immediately because it is short-circuited. by switch 217, When switch 217 opens, the initial circuit of relay 213 is interrupted, after which the latch circuit by relay 212 comes into action and relay 212 is actuated in series with relay 213.

   When relay 212 operates, it opens its lower armature at a point in the circuit of non-actuated relay 206, and at its upper armature, it switches the connection of impulse conductor 218 by connecting it to relay 211 in place of relay 213 Therefore, relay 211 is

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 activated when switch 217 closes the next time, and it locks itself by relay 210 with the result that relay 210 is activated as soon as switch 217 opens again. Note that relay 210 opens the circuit of relays 212 and 213, after which these relays drop out.



   This operation continues in the manner described, until common stop conductor 220 is connected by a relay similar to relay 211 or relay 213 to an individual stop conductor, such as conductor 222, who is put the earth. Since it has been assumed that the call arrives through the local connector HERE, and since the local connector LOI corresponds to relays 206 and 207 which are the last to be activated, the operation continues until relay 207 is actuated subsequently to the action of the relays 209 and 208. When the relay 207 is actuated, it locks itself against the interlocking conductor 219 by the relay 210 and the lower armature of the relay 212, which relay was subsequently returned. the action of relay 210.

   As a further result of its action, the relay 207 connects to its lower frame the individual restraint conductor 226 to the common restraint conductor 231, and to its inner lower frame, it connects the individual stop conductor 222 which was previously set. earth in the local connector LC1, to the common stop conductor 220, thus closing a circuit through the contacts of the relays 204 and 203 for the stop relay 201.

   The relay 201 is actuated and disconnects the switch 217 from the pulse conductor 218, its upper middle armature, thus stopping the pulse transmission. The result is the opening of the

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 initial circuit of relay 207, after which relay 206 works in series with relay 207 and opens the circuit of relays 208 'and 209 which drop out, after which relay 208 again connects pulse conductor 218 to relay 213.



  As a further result of the action of the stop relay 201, a circuit is completed for the relay 202 at its upper inner armature, which circuit will be explained later.



  At its upper armature, the relay 201 establishes a multiple connection to the ground of the starting conductor 221, and its lower armature, it grounds the common retaining conductor 231, thereby connecting the individual retaining conductor. 226 is grounded by the lower contacts of relay 207. When this occurs, a circuit is closed by the contacts of relay 318, fig. 3, for restraint relay 309.



  The restraint relay-309 is actuated and connects at its upper and lower armatures the conversation conductors 223 and 224 of the service line to the corresponding conductors of the connector. As a further result of its action, relay 309 prepares at its lower inner frame a circuit for vertical magnet 328, and at its lower middle frame, it opens a point in the circuit of relay 345 in the time-coordinated device in a goal which will be explained later.



   In the service connection equipment, fig. 2, relay 202 is now energized in a circuit from the battery by the contacts of relay 201, the middle of the left-hand coil of the repeater coil, the two conductors connecting in parallel, the contacts of the EK key,

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 the contacts of relay 121, the portion between control units of the OT service line, the contacts of the TK2 and TK1 switching buttons, the right winding of the repeater coil in the main control unit, the contacts of the answer button and release 104, relay contacts 102, relay coil 101, earth.

   When the relay 202, fig. 2, is actuated in this circuit, it opens a point of the pulse circuit its lower armature and it closes to its inner armature a circuit for the release relay 203. The relay 203 prepares its lower armature the pulse circuit; at its lower inner frame it closes a retaining circuit for the stop relay 201 and opens its initial circuit. The relay 204 is also energized, when the relay 203 is energized, and opens a later point in the initial circuit of the stop relay 201 for a purpose which will be explained later.



   In the main control unit, relay 101, fig. 1, is energized in the circuit shown above and turns on the coordinating call lamp. When the supervisor notices that this lamp has come on, he turns his key 104 to the right, that is to say in the answer position, so!, Connect the conversation conductors coordinated to his communication circuit. phone. As a further result of the operation of the key 104, the common adjustment conductor 105 is connected to the action branch of the service line OT. by disconnecting relay 101 at the same time.

   Relay 101 is therefore de-energized and the call lamp goes out, the current through the control line.

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 service now passing through the call device CD1. As a further result of the operation of key 104, a circuit for relay 103 is closed, after which relay 103 kicks in and locks itself by the release contacts of key 104 by closing to its armature. Upper one circuit for relay 102. Relay 102 is energized and opens a further point in the circuit of relay 101 while at the same time closing a circuit for the busy lamp.



   The supervisor now speaks with the calling subscriber and learns the desired number, after which he operates his calling device CD1 in accordance with the digits on the number. Referring to Figure 4, note that the line from apparatus B terminates in the third set of contacts on the eighth floor. The line number is therefore 83. Apparatus B was assumed to be designated by code number 5, in which case the full number is 83-5.



   When the device CD1 is operated in accordance with the first digit 8, eight interrupts are produced in the circuit of the relay 202, fig. 2. As a result, relay 202 drops out eight times momentarily. Each time it drops out, the relay 202 causes its lower armature to earth the pulse conductor 223 so as to transmit eight current pulses through this conductor to the vertical magnet 326 of the connector. local LC1, fig. 3. Upon initial closure, the pulse circuit passes through the contacts of relay 309, the out of normal, normally closed contacts containing spring 325, and relay 314.

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  The wipers @ 01 to 403 of the connector are lifted step by step by the action of the vertical magnet, until they reach the eighth stage of the field contacts. Relay 314 is actuated in response to the first pulse of current, and since it is slow acting, it remains actuated throughout the vertical movement. Relay 314 opens at its lower armature a point in the circuit of rotating magnet 327 and prepares a new circuit for itself and for the vertical magnet which comes into action when the associated out-of-normal contacts are switched. , after the first vertical step.

   Upon receipt of the first pulse, interrupt relay 308 is actuated from two sources; its upper winding is energized from the upper contacts of the 314 series relay, and its lower winding is energized from the out-of-normal contacts 305 and multiple with the lower winding of the chain control relay 306.



  This double arrangement is intended to more reliably eliminate the risk of the relay failing to operate. After its action, the relay 308 locks itself against the conductor 328 at its upper inner frame; prepare for its lower frame a release circuit after occupancy; and at its two upper armatures, it cuts the earth of the starting conductor 221 and of the stop conductor, leaving the earth of the starting conductor 221 at the upper armature of the relay. 201, fig. 2.

   Interruption of the grounding conductor 221 prevents the connector from being re-gripped

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 by the service connection equipment until the connector has been released and re-entered by a line selector.



   When the grounding of the stop conductor is interrupted, relay 204, fig. 2, falls and closes a point in the stop circuit 201 which is then kept in action by the relay 203.



   At the end of the vertical movement, the relay 314 drops out and connects the impulse conductor to the rotating magnet 327 instead of the vertical magnet 326.



   When the supervisor places his dial on the second digit 3 of the number, three pulses are delivered through the channel of the conductor 225 to the rotating magnet 327 of the connector by the contacts of the relay 309, the contacts out of normal, normally. open 325, the lower armature of relay 314, and the contacts of relays 315 and 317. By the action of the repeating magnets, the wipers 401 IL 403, fig. 4, are rotated and engaged with the field contacts on which the line of device B ends. The slow-acting change relay 316 is energized in multiple with the rotating magnet 327 during the entire movement of the device. rotation.

   At its upper armature, it disconnects the conductor of the test wiper 354 from the upper winding of the selector relay 317 and connects it, instead of the latter, by contacts of the relay 317 to the occupant relay. tion 315, and at its lower inner armature, it closes a branch around the corresponding contacts of occupancy relay 315, so as to prevent premature opening of the rotary magnet circuit in the event that the test lever 402

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 would encounter occupied test contacts during the rotation of the connector, which would actuate the occupancy relay 315. the action that occurs at the end of the rotational movement of the connector, depends on) the condition of the called line, that is to say whether it is occupied or free.

   Assuming first that the called line is busy, the test wiper 402 encounters a ground potential on the called line test contact, and the busy relay 315 is energized by conductor 354, when the connector contact levers come to a stop. When in this condition the relay 316 drops out, it completes a latching circuit for the occupancy relay 315 to the driver 328 by the upper armature actuated from the relay 315; ilovre the control circuit to its lower inner frame; andto its lower armor it connects the occupied conductor to the lower conversation conductor through the lower contacts of relay 315. In this way, the acoustic occupancy signal is transmitted to the supervisor via the service line and to the operator. subscriber calling through his line.

   When the calling subscriber hears this busy signal, all he has to do is hang up his receiver and call again later. When the supervisor disconnects from the line, the connector is released by the action explained below of relay 313, when its circuit is closed at the lower middle armature of relay 309.



  This circuit contains the lower armature of the actuated relay 308 and a lower armature of the non-actuated relay 317.

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   Now assuming that the line of the device B is free, during the call, the occupation relay 315 is not actuated, when the contact levers of the connector come to rest on the contacts of the line called, and a circuit for the upper coil of relay 317 is closed to the upper armature of relay 316, when it drops out. This circuit runs from earth to the grounded interlocking conductor 328, through the upper armature of relay 315, the upper armature of relay 317, the upper armature of relay 316, conductor 354, the contact slider. test 402, the test contact of the called line and the conductors 417 to the beat, by the interrupt winding of the line selector (not shown) coordinated to the called line.

   This winding corresponds to the interrupt winding 304 of the line selector LS, fig. 3. The interrupting armature of the called line selector comes into action to cut the connection between the line relay associated with the called line.



   In the connector, fig. 3, relay 317 is actuated by its upper winding, and at its lower inner winding it closes a latch circuit for itself to the grounded latch conductor 328. At another lower armature, it disconnects the service conductor from the rotating magnet 327 and connects it to the conductor 355; to another lower armature, it opens a point in the circuit of the forced release relay 313 so as to prevent premature release, when the relay 309 subsequently drops out after disconnection of the service line from the connector it prepares to

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 its lowest armature a ringing return circuit through the associated small capacity capacitor;

   it opens a later point in the circuit. of the relay occupied 315 h its upper internal frame; and at its top armature, it closes a direct connection between the grounded latch conductor 328 and the test wiper conductor 354, so as to occupy the line called by a circuit excluding its own top winding.



   Having adjusted the connector to the contacts of the called line, the operator now chooses the code selection number 5 on his dial, in order to activate the code selector CS1, fig. 1, to make the selection of the code assigned to the device B. When this last digit is adjusted, five current pulses are transmitted to the advancing magnet 409 of the code selector CS1 by the way of the conductor 355 and by the series relay 406. In response to these five pulses, the advancing magnet 409 of the code selector CS1 advances the wipers 411 and 412 gradually, until they come to a stop. on the fifth set of associated field contacts. The relay 406 is maintained in action in series with the advancement magnet of the code selector throughout its action.

   At its internal armature, it bypasses the internal contacts of the relay out of normal 415 so as to keep the control circuit intact after the relay out of normal 415 operates during the first movement out of normal of the selector wipers. When the last pulse has been completed, relay 406 drops out and opens the service circuit. A latch circuit for relays 407 and 408 is prepared at the lower armature of relay 405, and a receive circuit is now prepared by the middle armature of relay 405 and the lower armature of relay 406 for

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 the reception relay 407.

   As soon as the CG code generator, fig. 6, now arrives at the position shown in the drawing, the connection to the earth by the grounding wiper 1% is placed at the receiving conductor. As a result, a circuit is closed for the receive relay 407 in the code selector CS1, fig. 4, Relay 407 is actuated and locks itself by the lower armature of relay 405, at the same time opening its initial circuit. At its lower middle frame, relay 407 connects the common stop conductor to individual stop conductor 356 in preparation for advancing the circuits from the ringing position to the talking position.

   As a further result of the action of the receiving relay 407, the bell conductors 352 and 358 are connected by the upper and lower contacts of this relay to the wipers 411 and 412 with the result that the corresponding code has the adjustment of these rubbers is placed on these conductors and on the called line, as will be described subsequently.



   Returning now to the main control unit, fig.



  1, the supervisor, after adjusting the desired number, waits only the time necessary to hear the return ring signal, which indicates that the line is signaled, and then operates his key 104 to put it on. 1 the release position. In this position of the button, the service conductor, connected to the center of the associated right winding of the repeater coil, is connected back to the branch normally going to earth by relay 101. This branch is however now open to relay contacts

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 102 and also to the contacts of the release key; consequently the line relay 202, fig. 2, drops back and releases the connection to the service line and connector in a manner which will be briefly described.



   Key 104 opens on its lower left contact the latching circuit of slow-acting relay 103. Relay 103 drops out after a small interval and opens the circuit of slow-acting relay 102. Slow-acting relay 1 drops out after a short interval. small interval and opens the circuit of the occupancy lamp at its lower armature, at the same time preparing a circuit for the relay 101 in its upper armature. The supervisor now returns his key 104 to the normal position, since the line service has been disconnected from the local LOI connector in the SAMX during the time required for relays 103 and 102 to be able to drop out, which will be described below.



   When the relay 202, fig. 2, drops in response to the opening of its circuit by the key 104, fig. 1, it again establishes an earth of the pulse conductor 225, but no action is taken by the fact that this pulse conductor is open in the code selector CS1, fig.



  4. At its inner frame, relay 202 opens a circuit for slow-acting release relay 203, and relay 203 drops out after a small interval and interrupts its bottom armature grounding the pulse conductor 225. , by simultaneously opening the circuit of relay 201. Relay 201 then drops out and cuts at its lower armature

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 grounding of the retaining conductor 231. By the fact that the relay 201 has dropped, the grounded switch, 217 is again connected by the upper contact of the relay 205 to the impulse conductor 218.

   The finder relays are put into action again, but since the grounding of the starter conductor 221 is now interrupted at the upper armature of relay 201, relay 205 immediately drops out and stops the action of the finder and releases them. relays actuated, 1 unless the starter conductor 221 has meanwhile been grounded by another calling connector.



   As a result of the interruption of the earthing of the common retaining conductor 231 by the relay 201, the earthing of the retaining conductor connected thereto 226 is interrupted, and the retaining relay 309 of the connector, fig. . 3, drops down and disconnects at its upper and lower reinforcements the conversation conductors of the connector, of the conversation conductors of the service line 223 and 224. At its lower inner reinforcement, it opens a later point in the local branch of the service conductor 225 and at its lower middle armature it again closes a circuit for the relay 345 of the coordinated counter device, after which this device is turned on to limit the duration of the conversation in a manner described below.



   Returning now to the connection established, the friction switch 412 of the IL selector code CS1, fig. 4, is now earthed and the wiper 411 is linked to the code conductor.



  There is a connection through the lower contacts of relay 407 and conductor 358 between the grounded contact lever 412 of the code selector and the lower contact 403

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 connector This connection contains the lower frame of the relay 318 and a conductor 357. There is a similar connection between the slider 411 and the upper conversation slider 401 of the connector. This last connection contains the upper contacts of relay 407, conductor 352, one of the upper armatures of relay 318 and conductor 353.



  As a result, the ringing current flowing through conductor of code no. 5 is transmitted to the called line through the wiper 401 of the connector and returns to the earth through the wiper 4031 Regarding the CG code generator, fig. 6, the code for driver no.5 includes five rings. These five rings are preceded by a long warning ring.



  The reason for this arrangement is that the code is only transmitted once and the long warning bell is given in the line before the regular code, so that all subscribers will listen during the call. time that the code is transmitted. The path by which this code, together with the long warning bell, is printed to conductor code # 5 from the ringing current source coordinated by the brushes of the code generator, may be referred to in the drawing.

   It should be observed, however, that the conducting segments of the ta @ bears are not connected to any current source or connected together in series except for the connections represented by the connecting conductors which are indicated as being located on the surface. - that of the drum. In reality, these drivers can be drowned

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 in the drum instead of being located on its surface.



   After the last code bell has been sounded, the stop conductor is momentarily set to. earth, when the stop brush on the code generator meets the last segment. When the stop conductor is earthed, a circuit is closed by the lower middle armature of the receiving relay 407, fig. 4, for the stop relay 408. The relay 08 energizes and locks itself to earth by the lower contacts of the relay out of normal 405. The releasing magnet 410 is energized in parallel with the relay 408 and in series with the low-winding monitoring relay 736, fig. 7.

   When the release magnet is actuated, the code selector is released and returns to the normal position and the out-of-normal relay 405 drops out and releases the relays 407 and 408 while simultaneously opening the release magnet circuit.



   A circuit is completed (when the stop conductor is earthed) through conductor path 356 for the bell interrupt relay 318 of the connector, fig. 3.



  Relay 318 is actuated and locks itself to the grounded interlocking conductor 328 in its upper inner armature by simultaneously opening its initial circuit and opening the circuit of slow action relay 319. To its armature. lower and one of its upper reinforcements, it disconnects the contact levers 401 and 403 of the connector (s) 411 and 412 of the code selector CS1, and connects

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 its levers to the conversation conductors * - arriving from the connec their) so as to complete the conversation circuit up to the called line.

   At its upper armature, relay 318 connects final ringing relay 320 to the upper and lower conversation conductors of the connector, so as to subject the release of the connector to the control of the calling line, and to another. from its upper reinforcements it disconnects relay 309 from restraint conductor 226, after which relay 309 drops out and disconnects the conversation conductors from the connector of the corresponding conductors of the service line in case the supervisor has not. released the circuit in the manner described above.

   When relay 300 is connected to the talk leads by relay 318, it is bypassed by the contacts of slow acting relay 319. Slow acting relay 319 zest in action for an interval and keeps relay 320 shorted. for a time sufficient to allow any load that may exist on the conversation conductors or the calling line or called line to drain before the short circuit is removed. This is particularly important in the case that a capacitor is connected in series with the called doorbell in which case the capacitor might have retained a charge at the end of the last ringing current pulse transmitted to the called line.



   When the subscriber to device B responds to the code signal assigned to his device by picking up his receiver, the conversation can take place in the usual manner.

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When the conversation is over, subscribers to devices A and B hang up their receivers. The subscriber to apparatus A, who is the calling party, gives the final ringing bell by operating his hand generator momentarily in the usual manner. The momentary doorbell current pulse generated in this way operates relay 320 of the connector. On action, relay 320 closes a circuit from grounded interlock conductor 328 to slow action relay 311.

   Relay 311 is actuated and closes a circuit for slow-acting relay 312, Relay 312 is actuated and prepares a circuit for slow-acting release 1 relay 313. When the ringing current pulse has ended, the relay 311, which is slow-acting so that it can hold while relay 320 vibrates in response to the ringing current, now drops out and closes a circuit for relay 313 through the contacts of relay 312, opening at the same time the circuit of the relay 312. The relay 313 is actuated and remains in action until the relay 312 responds, after which the relay 313 is again brought to rest. While relay 313 is energized, the ground of release conductor 376 is interrupted at the contacts of relay 313.

   When this grounding is interrupted, the current stops flowing through the interrupt and hold winding 304 of the LS line selector, the upper winding of the relay 306 of the connector and the relay winding. 307. When this occurs, the LS line selector is released, and the connector relay 307 drops. Relay 306 remains actuated

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 during the time necessary for the current to flow through its lower winding from the out of normal contacts 305.

   When the LS line selector is released, the connection with the release conductor 376 is interrupted so that the normal conductor deprived of the line and the restraint conductor 377 are not grounded again, when the conductor release 376 is grounded by relay 313.



   As a result of deenergization of the connector holding relay 307, the grounding of the latch conductor 328 is interrupted, after which the latched relays 317 and 318 de-energize. relay 308 does not drop out at this time, as a result of the current flowing through its lower winding in parallel with the lower winding of relay 306. As a further result of the de-energization of relay 307, a circuit is closed to the upper internal contacts of this relay by the associated out-of-normal contacts for the release magnet 321, by terminal 753 and the monitoring relay 736, fig. 7.

   By the action of the release magnet, the levers of contais 401 403, fig. 4, of the connector are returned to their normal positions in the usual manner, and the out-of-normal contacts of the selector are returned to their normal position, after which the circuit of the release magnet 321 is interrupted. When the out of normal 305 contacts open; relays 306 and 308 drop out.



  The relay 306 makes the connector again selectable by the associated main selector, by interrupting at its lower armature the grounding of the test conductor 378.

  <Desc / Clms Page number 28>

 



   The connection is completely released and the equipment contained therein is again ready to be used for establishing further connections: '
It will now be assumed that the subscriber of device A wishes to call another subscriber whose device is connected to the same line, the other device having as signal a code different from that of device A. We will also assume that the local LOI connector is the one entered by the LS line selector when the receiver is off-hook. If it is aihsi, the connection is completed as previously described between the service line and the local LOI connector by the relay finder, fig. 2.



   When the supervisor answers and receives the information that the calling subscriber wishes to complete a connection with another device on the same line, the supervisor adjusts the conneeteur by choosing the digits 7 and 0 on its dial (the call combination changed), after which it adjusts the code selector TS1, fig. 4, in accordance with the code assigned to the device called on the calling line. The supervisor requests the calling subscriber to hang up his receiver and wait until the called subscriber's code has been transmitted before picking up the receiver again, because otherwise , part of the ringing current would be diverted to device A and unpleasant noises would be produced in the receiver by the ringing current.



   Note that the field contact group of local connector no. 70 is driverless mlple for

  <Desc / Clms Page number 29>

 avoid interference if two or more conversations are transmitted at the same time.



   When the wipers are fitted to the field contacts (70) by pulses transmitted through the path of the conductor 225 under the control of the supervisor as previously described, the contact springs 324 of (70) are closed, after which the relay call reversal 310 is actuated. When the relay 310 is actuated, it opens at its upper and lower armatures the conversion connection between the actuated connector and the service line, so as to prevent the ringing current, which must be applied subsequently) from reaching the service line in case the supervisor has not disconnected when the ringing current is started. Relay 310 prepares a circuit for relay 313 in its lower inner frame so that the connector can be released when the ringing period is over.



   As mentioned, the contacts (70) are without multiple connection. The contact (70) in the field of test lever 402, however, is connected to the battery by a resistor, so as to form a circuit for the test winding of relay 317 when a reverse call is made. performed.



  The corresponding contacts in the other fields of the connector are similarly connected to the battery, each by a separate resistor.



   When the connector has been fitted, relay 317 is actuated by its upper winding and by the / wiper

  <Desc / Clms Page number 30>

 test 402 which encounters a battery potential on the contact to which it is adjusted taking into account the aforementioned individual resistance Relay 317 performs a switching action as previously described, including switching the impulse conductor connected to the magnet rotary 327 on the impulse conductor 355.



   When the supervisor adjusts the code selection digit on his dial, the code selector CS1 is actuated through driver channel 355 in accordance with the assigned code to the called device. At the end of the action of the code selector, the relay 406 drops out as previously described and establishes the connection with the reception relay, with the result that the reception relay 407 is actuated and connects the wipers 411 and 412 of the selector code. After the action of the receive relay, the ringing current is transmitted from the wiper 411 through the conductor 352 and returns to earth through the conductor 358 and the wiper 412.

   Since the field contacts on which the wipers 401 and 403 of the connector are based are left free, the ringing current does not pass through this path during this time. Instead of this path, the ringing current passes through the upper and lower armatures of the reversing call relay 310 and then returns to the calling line, thereby ringing all the bells on the calling line.



   After the ringing current has been transmitted, the stop relay 408 of the code selector CS1 is actuated and locks itself in the above-described manner with the result.

  <Desc / Clms Page number 31>

 that the code selector is returned to normal. At the same time, the previously described current pulse is supplied to the bell interrupt relay 318 of the connector through the path of the conductor 356, with the result that the relay 318 is actuated and performs the switching operations previously described. During this time, since relay 308 is actuated, a branch circuit is closed through the path of conductor 356 by actuated contacts of relay 310 and closing wire 379 for release relay 313.

   The release relay 313 is then actuated and releases the connector in the manner previously described, so that the two subscribers on the line of device A can freely talk to each other without having any part of the equipment of the device. central in the circuit.



   The calling subscriber, as well as the called subscriber, hears the code of the called subscriber who picks up his receiver after the code has been transmitted, with the result that the two subscribers can carry on their conversation as soon as the called subscriber answer. The calling subscriber is instructed not to ring the reverse call termination, because this would activate the LS line selector and unnecessarily give the supervisor a signal.



   It should be noted that the line of device A is not protected after the connector has been released, and is therefore not protected during the conversation. In many places, subscribers object to this lack of protection because a line is called occasionally while two subscribers are on a call in one connection.

  <Desc / Clms Page number 32>

 inversion with the result that the line is intruded and with the subsequent result that very often the application of the ringing current during their conversation results in a very annoying noise in their receivers. In this case, precautions are taken so that the lines remain protected during the conversation.

   This is achieved by simply omitting the closing wire 379, fig. 3; release relay 313 is then not actuated when releasing the code selector CS1 at the end of the application of the ringing current. when this closing wire fails, subscribers are instructed to ring the final bell at the end of reverse calls as well as at the end of other calls.



   The connector is then released at the end of the conversation in the manner previously described.



   In such a system, it often happens that a subscriber ends a conversation and leaves his telephone without ringing the final bell. In this case, the connector is left in action and cannot be used by another subscriber before being released. In order to provide for the release / of connectors that remain in action in this way and in order to provide for the release of line selectors in the event that a subscriber calls and does not receive a response from the supervisor, we has placed an individual time device at each connector. An individual TS time device at the local connector ICI is shown in Fig. 3. This time device is arranged to complete the operation of the connector and to release a connection five minutes after it is started.



  This time is obviously absolutely arbitrary and the device can be set for any other time interval.

  <Desc / Clms Page number 33>

 



   Now assuming that the connector shown in Figure 3 is grasped by a line selector such as LS, the restraint relay 307 is actuated through the path of the restraint conductor 377 in the manner previously described, closing a circuit for the relay. 345 of the time device by the shaft contacts of stage "0" and the lower middle armature of the relay 309. The relay 345 is actuated and closes the circuit for the advancing magnet 347 time circuit breaker. the thirty-second switch 346 common to the various time devices.

   This circuit is completed every thirty seconds and again interrupted by the common switch with the result that the feed magnet 347 is actuated once every thirty seconds so as to advance the wipers 350 and 351. one step each time he works. Relay 309 is usually actuated upon response from the supervisor after the connector has been spotted by the researcher shown in FIG. 2, whereupon relay 345 drops out and releases the counter device by closing a circuit for releasing magnet 348 through out-of-normal contacts 349.

   Assuming, however, that the call was ignored for some reason, the advancement of rubbers 350 and 351 continues until lever 350 reaches its / tenth field contact, after about five minutes. . when the wiper 350 reaches its tenth contact, it closes a circuit for the relay 313. The relay 313 is actuated and interrupts the setting%. the earth of the release conductor 376, after which the LS line selector is reset to the state

  <Desc / Clms Page number 34>

 normal and relay 307 drops out.

   When the relay 307 drops out, it opens the circuit of the relay 345, after which the time device is released by the action of the magnet 348, and the relay 313 is returned to the normal state, when its circuit is open during the return of lever 350 to the normal position. The IS line selector remains in the normal position until the calling subscriber rings again to make another attempt to obtain the desired connection.



   Assuming now that a connection has been made by the LS line selector to the local connector LC1, and the supervisor has responded and relay 309 has been actuated, relay 345 is released in the manner previously described in l. 'lower middle armature of relay 309. The time device remains at rest until the connector and the code selector have been actuated and until the service line has been disconnected from the local connector; at this point relay 309 drops out and again establishes a circuit for relay 345. Upon action of relay 345, the timing device is actuated once every thirty seconds as previously described.

   When the conversation has lasted for about five minutes (assuming the conversation reaches that length of time) the slider 351 engages its associated eighth contact. This occurs at a time when the advancing magnet 347 is energized, and the advancing magnet remains energized for a few seconds, while the switch 346 goes through its closed position. When the advancing magnet is energized, and the slider 351 relies on its eighth contact, a circuit is closed from the common generator with warning signal WTG to the conversation conductor.

  <Desc / Clms Page number 35>

 inferior. This signal is thus heard by the subscribers in conversation and they are thus warned that the connection will still exist for approximately one minute more.

   It should be noted that the warning signal generator is simply a transformer with a switch for interrupting a battery circuit passing through its primary winding. The battery circuit is normally open and is closed only momentarily at intervals. This results in a succession of ticking which persists for a few seconds while the switch 346 passes through its closed position. These ticks don't follow each other quickly enough, nor are they far enough to interfere with the conversation. At the end of a switch on period, magnet 347 drops back and opens the warning signal circuit.



   If the connection is not released by the final ringing before the device in time reaches its last position; the release is effected by the wiper 350 which reaches its last contact and actuates the release relay 313. The line selector LS is released as previously described and the release of the connector is effected in response to the de-energization of the relay 307. which closes the circuit from the releasing magnet to its upper inner contacts.



   It should be observed that releasing the connector cuts off the conversation by interrupting the connection if. a regular call between two separate lines was made, but the,

  <Desc / Clms Page number 36>

 subscribers can continue the conversation if the call is a reverse call between two subscribers of the same line, the arrangement being rather intended, to make the equipment free for use when it is initiated by the fact that two subscribers forgot the final ringing, only to limit the talk time, although the latter result was of considerable use.

   It should be noted that a line is not protected after the connector has been released by the device in time and the subscribers of the same line run the risk of being disturbed when they continue their conversation.



   We will now examine the path by which the calls between a line of S.A.M.X. and an outside line. There are two classes of these connections depending on the origin of the call. The connections going to the outside are. divide into two groups according to the distance over which the conversation is desired. A connection established with a line whose distance is only relatively small is ordinarily established by the remote service supervisor while the calling subscriber is waiting for a response and is referred to as a two-number connection, while connections with more distant lines are established by the supervisor who calls the calling subscriber again when the connection is ready.



   By first considering a connection * two numbers, it will be assumed that the subscriber of apparatus A wishes to speak with a subscriber outside his local exchange whose line terminates in a neighboring central. The subscriber of device A brings

  <Desc / Clms Page number 37>

 its LS line selector to enter a free connector, the local LC1 connector for example (fig. 3), after which the supervisor is notified in the usual way. When the supervisor answers and asks for the number, the subscriber answers "long distance".



     After learning that the calling subscriber requests a long distance connection, the supervisor observes the condition of the busy lamps associated with the remote lines. If the two remote lines are free, it can choose the assigned number 1 from either of the two, but if one is busy, it chooses the number assigned to the other remote line. If both remote lines are in use, the attendant informs the calling subscriber that the "long distance" is busy.



   Referring to Figure 4, it will be appreciated that the first and second sets of field contacts at the tenth stage of the local connectors are conductor-connected to the first and second remote connectors TO1 and TC2 respectively.



  In this case, we will suppose that the remote line TOI is free, and that the supervisor chooses the number 01 assigned to this line. When adjusting this number, the local connector LC1, fig. 3, responds in the usual way and brought its trotter 401 to 403, fig. 4, on the first set of field contacts at the "O" stage, these being the contacts to which the conductors 413 to 415 leading to the TOI remote connector are connected.



   When the connector shaft is lifted to tenth

  <Desc / Clms Page number 38>

 stage, the shaft contacts 322 and 323 of stage "0", fig. 3, are actuated. Contact 322 removes the bypass of the associated talk capacitor for a purpose which will be explained later. A point in the timing device relay circuit 345 is open at contacts 323, since it is not desirable to use this% device. time in connection with outside calls, and a circuit is prepared by contacts 323 in their displaced position for the lower winding of bell interrupt relay 318.



   When the relay 316, fig. 3, falls back at the end of the rotary movement of the connector and connects the test wiper conductor 354. earth by the upper winding of relay 317, relay 317 is actuated by test wiper 402 of the connector, fig. 4, and through the normal private driver 414 going to the remote connector TT1, fig. 5. Relay 317 closes its usual latch circuit and transfers the pulse lead to branch lead 355 which goes to code selector CS1, fig. 4.



   The supervisor releases the service line from local connector LC1, as previously described, as soon as it has adjusted the last digit 1 of the number assigned to remote line TT1. This done, a current pulse is transmitted during the release operation through the path of the conductor 355 and advances the advancing magnet 409 by one step during the time necessary for the release of the relay 203, fig. 2, only to drop out after its circuit has been opened by pulse relay 202.

  <Desc / Clms Page number 39>

 



   This action on the part of the code selector CS1 is only incidental, but since it is harmless, it was allowed to occur. When the pulse of the advancing magnet is finished, the relay 406 drops off and then the receive relay 407 is energized The code corresponding to position no. 1 of code selector CS1 is placed at wiper 411 and is sent back through conductor 352, but this ringing current does not reach the line because ring interrupt relay 318 is actuated when relay 309 drops out. , the circuit containing the lower middle armature of relay 309, the lower armature of relay 307 and springs 323 being modified. Code selector CS1 is released in the manner previously described, when stop relay 408 is pulled.



   When the test lever 402, fig. 4, is earthed at the end of the rotary movement of the connector, as previously described, a circuit by the conductor 414 is closed by the upper contacts of the relay 507, fig. 5, for the relay 505, and a branch circuit is closed by the upper contacts of the relay 503 for the relay 501. It will be recalled that this circuit is the one by which the upper winding of the relay 317 is actuated. The upper winding of relay 317 is bypassed in the usual manner to ground test wiper 402 directly, as soon as relay 317 is actuated and locks its own lower inner frame.

   When relay 505

  <Desc / Clms Page number 40>

 is actuated, it disconnects the conversation conductors associated with the right-hand winding of the repeater coil from the right-hand conversation conductors to which they are normally connected and connects them to the incoming normal conversation conductors 413 and 415.



   With its inner armature, relay 505 disconnects the impulse conductors connected to the inner terminals of the left repeater coil of line relay 506 and connects them instead of the latter, to relay 514 for a purpose which will be described. in the following. When the relay 701 is actuated by the conductor 414 in parallel with the relay il 505, / connects the lower conductor of the remote line to earth and connects the ringing current to the upper conductor of this line, so as to start the ringing current in the remote line, in order to notify the remote supervisor in the main control panel. To stop the application of the ringing current after a small interval, relay 501 closes a circuit for slow pull relay 502 in its lower inner frame.

   Relay 502 is actuated after a small interval and closes a circuit for the slow pull relay 503. Relay 503 operates and locks itself to the driver 414, at the same time opening the circuit of relay 501. Relay 501 drops out after a small interval and cuts off the ringing current of the remote line, at the same time opening the circuit of relay 502. Relay 502 drops out after a short interval and opens the initial circuit of relay 503 leaving relay 503 locked. to the driver 414.

  <Desc / Clms Page number 41>

 



   Relay 115, fig. 1, to the main central unit responds to the ringing current launched in the remote line TT1 and transmitted by the windings of the associated repeater coil, the lower winding of relay 115 being connected to the conversation conductors by the contacts of relay d interruption 114. When acting, relay 114) locks itself by its upper winding and the upper contacts of the interrupt relay. A circuit for the call lamp at the remote panel TB and for the one at the local panel LB is closed in parallel with the latching coil of relay 114. The supervisor at the local panel does not ordinarily respond to the lighting of the lamp. call on the remote panel.



   When the remote supervisor notices that the call lamp associated with the J2 jack has come on, he inserts the plug of a free string circuit into the jack, after which a circuit is closed by the upper springs of the jack. , jack for relay 113. Relay 113 is pull weak and when actuated, a circuit is completed for the occupancy lamps and for the interrupt relay 114, after which occupancy lamps are illuminated and the relay 114 comes into action and disconnects the lower winding of the relay 115, simultaneously de-energizing the upper winding of the relay and turning off the call lamps. Relay 113 also connects relay 112 through the contacts of adjustment key 117 to the pulse conductors connected to the inner terminals of the right windings of the repeater coil.

   When this occurs, relay 112 energizes by the

  <Desc / Clms Page number 42>

 Right windings of the repeater coil and through the line, distance and close a circuit for the coordinated monitoring lamp.



   At S.A.M.X., relay 514, fig. 5, which is connected to the remote line by the internal armatures of relay 505, the contacts of relay 513 and the left windings of the repeater coil, are energized in series with relay 112, fig. 1. Relay 514 closes a circuit for the co-ordinated slow-acting / relay 515, after which relay 515 is actuated and prepares a circuit for relay 504, so that the local connector can be released in an explained manner. in the following.



   After establishing a connection with the TT1 distance line via the J2 jack, fig. 1, the remote supervisor enters into conversation with the calling subscriber who informs him of the destination of the call. In addition to the desired number, the remote supervisor asks for the number of the calling device so that the exact conversation load can be noted.



   1 When the remote supervisor has learned the desired number, he establishes the connection with the line called by the upper plug of his code circuit in a well-known manner, after which the conversation can take place in the usual manner.



   With the remote attendant monitoring remote connections closely and listening frequently to determine if the conversation is over, subscribers can be instructed that there is no need to kick in.

  <Desc / Clms Page number 43>

 final doorbell after a remote call, because the remote connector is provided with arrangements to release the local connector.



   When the supervisor has listened and noted that the conversation is over and that the subscribers have hung up their receivers, he removes the plug from jack J2, fig. 1, after which the relay 113 drops out and opens the circuit of the interrupt relay 114 and the occupancy lamps. Relay 113 also opens the circuit of relay 112, after which relay 112 drops out and opens the circuit of the coordinated monitor lamp. When the circuit of relay 112 is open, relay 514, fig. 5, which was operated in series with relay 112 and by way of remote line 1, drops out. Relay 514 opens the circuit of slow acting relay 515, and relay 515 drops out a moment later.

   During the time required for relay 515 to drop out after its circuit has been opened, a circuit exists through the upper contacts - in relays 515 and 514 for relay '504, circuit containing the upper armature of relay 507 and the normal private conductor 414 grounded. Relay 504 is actuated and connects conductor 413 to earth, at the same time connecting the battery through a low resistance to conductor 415.



  When this occurs, a circuit is closed through the wipers 401. and 403, fig. 4, of the local connector LC1 and by the conductors 353 and 357 for the release control relay 320 through the contacts of the bell interrupt relay 318. The relay 309 is actuated and causes the action of release by smoking the usual circuit for relay 311.

  <Desc / Clms Page number 44>

 



  Current is prevented during this time from passing through the calling ignite through the capacitor coordinated to the open shaft cortacts 322 of the "0" stage. When relay 515 drops out, it opens the circuit of relay 504 and relay 504 drops out after a small interval and interrupts the connections of leads 413 and 415 with battery and earth. When this occurs, relay 320 drops out and the connection release occurs as previously described. When the earthing of the normal private conductor 414 is interrupted when releasing the local connector LC1, the relays 503 and 305, fig. 5, which were kept in action by the way of this conductor, fall back. The connection is now released, and the equipment it contained can be used to make further connections.



   It will now be assumed that the subscriber of apparatus A wishes to have a conversation with a subscriber located at a sufficiently large distance to establish the connection in the "long distance" group. This call is made in the usual way and the local supervisor of the main central unit chooses on his dial the number 01 or the number 02, whichever of the remote lines is free, for example the TT1 remote line ( number 01), after which the connection is established by the local connector, for example the local connector ICI, with the remote line TT1 in the manner previously described. The call bell is transmitted by the TT1 remote line in the manner previously described to notify the remote supervisor.

   When the remote supervisor responds, the above-described actions occur and

  <Desc / Clms Page number 45>

 the calling subscriber receives the information that he will be called later, because the desired connection is a long distance connection which takes some time to set up.



  The connection established with the remote supervisor is cut in the manner previously described, when the remote supervisor removes its plug from jack J2, fig. 1.



     After the supervisor has established a connection with the desired line, or has made sure that he can do so, he inserts the plug of a cord circuit into the jack of one of the lines 1 distance which is free, for example. example ljack J2, after which the relay 113 is actuated from the contacts of the jack 'and closes its upper armature the ordinary circuit of the occupancy lamp and the interrupt relay, at the same time connecting its lower armatures to the relay 112 to the pulse conductor connected to the inner terminals of the right repeater coil. when this occurs, the relay 112 operates through the remote line TT1 and closes a circuit for the coordinated monitoring lamp.



   In the SAMX, the line relay 506, which is normally connected to the remote line through the lower terminals of the associated left windings of the repeater coil through the upper contacts of relay 513, and through the lower contacts of the relay 505, works in series with the monitoring relay calling 112, fig. 1, and closes a circuit for the release relay 507.

   Relay 507 opens a point in the associated release magnet circuit, when it energizes and prepares the usual operating circuit with its lower armature, At its upper middle armature, the

  <Desc / Clms Page number 46>

 relay 705 earths the local interlocking conductor 541, and at its upper armature it disconnects the normal private conductor 414, from the local relays to which it is normally connected and connects it,%. the place of these relays, to earth in% way. make the remote line busy for local connectors.



     After having / occupied the remote line for use, the remote supervisor puts his call device CD2 in connection with it, by operating his call key 117. This key replaces the circuit by the call device CD2. and the release key to the branch circuit containing the relay 112. As a result, the relay 112 drops out when the set key is operated and the monitoring lamp goes out.



   When the supervisor places his dial on the first digit of the calling device number, the line relay circuit 506, fig. 4, is interrupted a corresponding number of times. Relay 605 drops out whenever its circuit is interrupted, and each time it transmits a current pulse to vertical magnet 516, the circuit through which the first current pulse is transmitted, containing the lower armature of the relay 507, the associated out of normal contacts, normally closed, and the series relay 508. As a result of the action of the vertical magnet, the wipers 601 to 605, fig, 6, are gradually raised until 'they arrive in front of the desired level of the field contacts.

   The 508 slow-acting series relay kicks in when the first pulse is delivered and stays in action for the entire time.

  <Desc / Clms Page number 47>

 vertical movement. Relay 508 is used to keep its own circuit and that of the vertical magnet intact after the assisting out-of-normal springs have been moved during the first out-of-normal movement of the selector. At the end of the vertical movement, the relay 508 drops out and transfers the operating conductor through the non-normal, normally open contacts, to the rotating magnet 518.



   When the supervisor places his dial on the next number, the rotating magnet 518 responds by printing to the wipers 601 to 605, fig. 6, one rotation so that they engage with the contacts of the calling line which is called again. Relay 511 works in parallel with rotating magnet 518 when the first pulse is supplied to the rotating magnet, and since this relay is slow acting, it remains in action during the rotary movement of the selector.

   At its inner top frame, relay 511 disconnects the test walker lead 522 from the test winding of relay 512 and connects it to occupancy relay 510, and at its bottom frame it connects a bypass to the corresponding contacts occupancy relay 510, so as to maintain its own circuit and that of the rotating magnet intact during the rotary movement in the event that the occupancy relay 510 is energized by the fact that the test wiper 601 , fig. 6, passes over grounded test contacts.



   The action which takes place at the end of the rotary movement depends on the state of the line which has been called again, that is to say whether it has been occupied in the meantime or whether it is still free. If the line is busy, the busy relay

  <Desc / Clms Page number 48>

 pation 510 is energized by way of conductor 522 and test wiper 601a. the end of the rotary movement, and when the relay 511 drops, it completes the blocking circuit of the relay 510 to the conductor 541, at the same time opening its lower contacts the pulse circuit to prevent a continuation of the rotary movement.

   When the occupancy relay is energized, there is a connection between the lower talk conductor and the occupancy signal conductor through the lower contacts of the occupancy relay, and the upper talk conductor is. earthed to the upper contacts of the busy relay so as to form a circuit path for the current of the busy signal through the left windings of the repeater coil, so that the supervisor receives a busy signal .



   Assuming now that the line is still free, the occupancy relay 510 is not actuated at the end of the rotary movement and when the relay 511 has dropped, the relay 512 is energized by its winding of es. - sai, the lower terminal of the test winding being connected to the earthed blocking conductor 541 by the occupancy relay contacts 510 and the upper terminal of the winding being connected to the wiper 602 by the contacts relay 511 and by conductor 522. Relay 512 B energizes via the field contact on which the wiper 602 is based (this field contact being omitted for simplicity) and the normal conductor private going to the LS line selector, fig. 3.



  Line selector interrupt winding 304 is therefore energized and disconnects relay 302 from the line to which

  <Desc / Clms Page number 49>

 it was connected as a bridge, but the fall of the armature does not take place due to the relatively low power of the interrupting coil.

   When the relay 512 of the remote connector, fig. 5, is actuated it blocks its lower winding against the conductor 541 its lower inner frame; it connects the grounded conductor 541 directly to the conductor 522 of the test wiper of the adjacent armature, so as to connect the test wiper directly to the earth; transferring to another dense lower armature the impulse conductor from the rotating magnet 518 through the contacts of relay 513 to branch conductor 525 going to the code selector CS2; and to its lower and upper reinforcements, it connects the conversion rubbers 501 and 503 by the conductors 520 and 527.



   When the supervisor places his dial on the assigned code number 1 of device A, the current pulses are transmitted by the branch conductor 525 µ. The advancement magnet 510 of the code selector CS2 through the relay contacts 606 and by the relay of series 607. The wipers 612 and 613 are brought $. the correct position by the action of the advancement magnet. Relay 607 is held in action during the setting of the last digit, in order to keep the advance circuit intact, after the out of normal relay 606 has been actuated during the first step of the selector.



  A circuit is prepared for the release magnet 611 the lower frame of the out-of-normal relay 606, and a blocking circuit for the relay 608 and 609 is prepared for the upper frame of the relay 606, a receiving circuit being prepare

  <Desc / Clms Page number 50>

 to the inner upper frame of said relay.



   At the end of the digit setting, the relay 607 drops out and opens the pulse circuit, at the same time closing another point of the receiving circuit, when the CG code generator reaches its receiving position, the receiving conductor is earthed by closing a circuit for the receive relay 608, which relay is actuated and locks itself against the local blocking conductor, at the same time opening its initial circuit. Relay 608 also prepares a circuit for stop relay 609 and connects wipers 612 and 613.

   During the subsequent movement of the CG code generator, the ringing current corresponding to the code assigned to device A is conducted on the line by the wipers 612 and 613 and by the conductors 519 and 528, the ringing current circuit containing the lower contacts. and upper relays 509 and 512 and the friction conductors 520 and 527.



   When the CG code generator reaches its stop position, the stop relay 609 is actuated by the way of the stop conductor, locking itself against the blocking conductor and its initial circuit At the same time, the relay 609 disconnects the wipers 612 and 613 in a% way. prevent further application of ringing current. A branch of the stop relay circuit extends from the conductor 521 to the bell interrupt relay 509 of the connector, and as a result, the bell interrupt relay 509 is actuated and locks itself against the conductor. 541, simultaneously opening its initial circuit.

   To its frames

  <Desc / Clms Page number 51>

 upper and lower, the relay 509 disconnects the rubbers 501 and 503, fig. 6, of the code selector wipers and connects them to the part of the conversation circuit connected to the associated winding of the repeater coil, thus completing the conversation circuit to the called line.



   As soon as the subscriber on the line of apparatus A answers, he can speak with the supervisor, and later, with the desired called subscriber as soon as the supervisor has completed the connection between the two lines. When the conversation is finished, the supervisor cuts the connection in the S.A.MX. by removing the plug from jack J2, fig. 1. When / the plug is removed, relay 113 drops out and opens the restraining circuit at its lower armature, at the same time opening at its upper armature the circuit of the interrupting relay and the occupancy lamp.

   When the hold circuit is open, the monitoring relay 112 drops out and turns off the coordinated monitoring lamp, and the remote line relay, fig. 4, drops out and opens the circuit of the release relay 507, The release relay 507 drops out after an interval and cuts the ground of the blocking conductor 541, after which the blocked relays 509 and 512 drop out.



  At its bottom armature, the release relay 507 connects the release conductor 526 to ground through the contacts of the relay 506, actuating the release magnet of the connector through the out of coordinated contacts and actuating the connector. release magnet 611 of the code selector by the conductor 526 and by the contacts of the relay 506. The connector and the code selector are thus returned to their normal positions.

  <Desc / Clms Page number 52>

 respective, with the connector release magnet circuit open to coordinated out-of-normal contacts. When the code selector reaches its normal position, out of normal relay 606 drops out and opens the release magnet circuit 611 and unlocks relays 608 and 609.

   The switchgear in the S.A.M.X. is now completely returned to normal and can be used to make subsequent connections.



   An incoming remote connection, i.e. an incoming remote connection to the S.A.M.X. is carried out by one of the two remote lines and by one of the remote connectors, the operations being the same as those just described in connection with the method of calling a subscriber calling by the remote supervisor.



   It will now be explained how the local supervisor at the main central unit monitors the traffic and prevents the loss of calls caused by the fact that the connectors are kept occupied incactively, that is to say are not not available to traffic. Referring to fig. 3, it will be noted that a chain relay is mounted on the main selector MS, this relay having a circuit containing a separate pair of contacts in each of said local connectors, the contacts being on relay 306 in local connector LC1 and on similar relays in the other connectors.

   The relay 306 acts by its upper winding, when the connector is gripped, and it remains held in action by its lower winding through the out of normal contacts 305 until

  <Desc / Clms Page number 53>

 the connector is returned to normal. When the last connector has been used, the chain relay 341 kicks in and disconnects the battery from the associated open main OMC connector, which is common to all line selectors such as LS, so as to prevent failure. action of all the others, and it disconnects the test wipers 343 and 344 from the test relay 342, so as to stop the action of the main selector, because a subsequent action of the main selector would at this moment be of no use.



   There is a normally energized start relay 210, fig. 2, the function of which is to signal in a distinctive way to the supervisor, by way of the service line, if all the connectors are in operation. We could assume that this relay is actuated from the selector chain relay! main, but it is not so, because it is not necessary and it is even undesirable to give the supervisor the special signal due to. that the last connector has been actuated, while relay 1 chain of the main selector comes into action when the last connector has been used.

   It will be recalled that relay 308 is actuated, either by its lower winding, or by its upper winding, or both, when the connector leaves its normal position, and it remains actuated until the connector is released. This relay and the corresponding relays of the other local connectors control relay 216, fig. 2, to send the special signal to the supervisor. Conductor 227 is normally grounded to each of the connectors at the top contacts of relay 308 and other relays.

  <Desc / Clms Page number 54>

 in the other connectors, and remains earthed until the last of these relays has been activated.



   Now assuming that all connectors have been grasped and actuated except the local connector HERE and this connector is grasped, relay 1 chain 341 is actuated and performs the aforementioned switching functions. The service line is connected to this local connector xxx and the supervisor is notified in the manner previously described.

   As soon as the supervisor now brings his dial to a number and causes the connector to move from its normal position, the last earth connection of conductor 227 is cut at the upper contacts of relay 308, after which relay 216, fig. 2, drops out and establishes a multiple connection to the ground of the starting conductor 224 '; it establishes a ground of the alarm branch of the stop conductor 220 to its lower inner frame; and it prepares a connection between the lower crossover conductor and the LV busy signal conductor at its lower frame.

   If it now happens that a connector is not released, before the operator has finished selecting the number and clearing the service line, the service line relay type finder will again switch on. action by the fact that the starting conductor remains earthed to the upper armature of the relay 216, after the relay 201 has dropped. When the operation is started, the counter relays 206 and 207

  <Desc / Clms Page number 55>

 finder are blocked against conductor 219 by the lower contacts of relay 212, but the other counter relays are reestablished. The relay 213 therefore works through the path of the pulse conductor 218 and the contacts of the relays 208, 210 and 212, closing a circuit for itself through the relay 212 and the lower contacts of the relay 210 to the conductor 219.



  The relay 212 is not actuated during this time by the fact that it is shorted by the switch 217. The relay 213 also prepares 1 its lower armature a circuit for the relay 214, and it closes at its lower armature. inside a circuit for the stop relay 201, by connecting the stop conductor 200 to earth to the lower inner frame of the relay 216. The relay 201 energizes when the conductor 220 is earthed and disconnects switch 217 to its upper armature, after which the relay 212, which is not shortened any longer, is actuated in series with the relay 213 and unlocks the relays 206 and 207 to its lower armature, connecting at the same time to its upper armature the impulse conductor disconnected at relay 211.

   The relay 201 also connects the relay 202 to its inner upper armature; it disconnects the line relay of the test line selector at its lower inner frame; and to its lower armature, it connects the retaining conductor 231 to the earth thus completing the circuit of relay 214 by the contacts of relay 213. Relay 214 connects the lower co-ordinated conversation conductor to earth and connects the upper conversation conductor by the little one

  <Desc / Clms Page number 56>

 capacitor associated with the busy signal conductor through the lower contacts of relays 215 and 216.

   As a result, the supervisor hears the busy signal when he responds to the usual signal produced by the connection of the relay.
202 by relay 201, When hearing the busy signal on the service line, the supervisor turns his key 104 to the release position, so as to produce the above-mentioned release action on the service line. opening the simplex earthed circuit. The supervisor then returns his key 104 to the normal position and precedes the stopping of the connectors in the S.A.M.X. in the manner described below.



   When the supervisor releases the service line by opening the simplex circuit via relay 202, fig. 2, the equipment associated with the service line restarts in the manner described above, but it starts up again and as soon as all the relays have been actuated and the relays 213 and 212 are working. again, the stop relay 201 is actuated again and notifies the supervisor again because the remake 216 remains de-energized, unless, of course, a connector has been released in the meantime.



   Since it is very possible that one or two local connectors are out of normal and not used due to the fact that the subscribers have omitted to ring the final bell, the supervisor proceeds to the use of the means 'by which he can listen to the different connectors and release each of them out of normal and out of function.

  <Desc / Clms Page number 57>

 



   To this end, the local supervisor takes note of the condition of the occupancy lamp associated with the remote connections to his panel. Assuming that the TT1 remote line is free according to the indication of the un-lit busy lamp just above the J1 jack, the local supervisor can insert the call plug of a free cord circuit into its position in the J1 jack. When the plug is inserted, a circuit is closed at the upper contacts of the jack for relay 111. Relay 111 is actuated and closes to its upper armature the usual circuit of the occupancy lamp and of the interrupting relay, connecting in at the same time at its lower armatures the conductors simplex through the contacts of the key 116 to the monitoring relays 110. The relay 110 is actuated and closes the circuit for the associated monitoring lamp.



   In the S.A.M.X., the relay 506 is actuated by the remote line and closes a circuit for the release relay 507 with the result that the action of the selector is prepared as described above. Monitoring conductors, such as 359-361, fig. 6, of the local connector terminate at the ninth stage of the fields of the remote connector 9, the local connector LOI being connected to the first set of field contacts, the local connector LC2 being connected the second set to the ninth stage, and so on.



     After establishing the connection with the remote line TT1, the local supervisor turns the key of the call device 116, thus disconnecting the simplex service conductors from the monitoring relay 110 and connecting them / to the conductors.

  <Desc / Clms Page number 58>

 grounded callers. Having done this, the supervisor operates the device CD1 in accordance with figure 9, thus interrupting nine times the current flowing through the simplex circuit of the remote line. Whenever the current is interrupted, the line relay 506, fig. 5, drops down and transmits a current pulse to vertical magnet 516. By the action of the vertical magnet, rubbers 601-605 are lifted to the ninth stage of the field contacts.

   By the combined action of relay 508 and the associated out-of-normal contacts, the pulse circuit is transferred from the vertical magnet to the rotating magnet.



   The supervisor now sets his dial to the number 1, so that a current pulse is transmitted to the rotating magnet 518 with the result that the wipers 601 - 605 are rotated by one step and come into engagement with the series of field contacts in which the conductors 359-361 terminate. Relay 515 is energized by relay 511 during the rotational movement. Note that all of the field contacts on the ninth stage of the wiper 602 are bonded together and are connected to the field contacts on the ninth stage of the wiper 605.

   This is to enable conversion relay 513, from the connector, fig. 5, to be actuated when the sliders are turned on the ninth floor,
Although the local LOI connector is occupied when the connection is made through the field contact series no, 91, the occupancy relay 510 of the connector is not actuated by the fact that the test wiper 602 n is not used for testing during this time.

  <Desc / Clms Page number 59>

 



   When the slow-acting relay 511 drops out at the end of the rotary motion, it opens the circuit of the slow-acting relay 515 and connects the test wiper 602 to earth through the upper winding of the relay 512. The winding upper relay 512 is then excited in series with the lower winding of relay 513 via conductors 522 and 524 and wipers 602 and 605.

   The relay 512 blocks itself towards the blocking conductor 541 and performs the switching actions described above, and the relay 513 blocks itself towards the same blocking conductor 511 at its inner upper frame; its lower armature, it disconnects the extended impulse conductor 525 leading to the code selector and connects it in return IL to the rotary magnet 518, in order to allow continued rotation of the wipers. As a subsequent result of the action of relay 513, conductor 521 is grounded to the upper middle armature of the relay, so as to actuate bell interrupt relay 509 to connect wipers 601 and 602.



   As a subsequent result of the energization of relay 513, xi this establishes at its inner bottom frame a ground of the release conductor 523 going to the release slider 604, but the ground is not grounded. During this time, it does not extend to the conductor 523 and to said rubbish by the fact that the slow acting relay 515 is still energized. As a further result of the action of / relay 513, the upper impulse conductor (coming from the inner terminal of the upper left winding of the coil

  <Desc / Clms Page number 60>

 associated repetition) is disconnected from line relay 506 and connected to relay 514.

   However, the relay 506 remains in action through the path of the lower connection conductor and the relay 514 is actuated by the way of the upper connection conductor and closes a new circuit for the relay 515 before said relay drops out.



   The supervisor can now listen at the local LOI connector and he can release this connector if he does not hear a conversation after inspecting the line in the usual way. Assuming he hears a conversation, the supervisor simply turns his dial to the number 1, after which a new current pulse is imparted to the rotating magnet of the connector by the contacts of the relays 512 and 513, after which the wipers advance a new step.

   Assuming however that the supervisor does not hear a conversation and receives no answer when he calls, he releases the local connector by turning the HK1 button, fig. 1, in its left position, so as to interrupt the earthing of the upper connection conductor and leave the earthing of the lower connection conductor by the call device CD1. When the ground of the top connecting conductor is interrupted, relay 514 drops out, and then slow-acting relay 515 drops out after a small interval and connects conductor 523 to ground through the associated contacts of relay 513.

   The grounding applied to the conductor 523 is extended by the wiper 604 and the field contact on which it rests,

  <Desc / Clms Page number 61>

 to the conductor 360 to release the relay 313 from the local connector LC1, fig. 3. When the release relay is energized, the local connector is released as previously described, and relay 313 is de-energized again when grounding of conductor 360 is interrupted in response to re-energizing relay 514. , fig. 5, by the supervisor, when he returns the release key RK1.



   When the connector is released, the connector 227 is again grounded to the upper contacts of the relay 308, and the relay 216 is energized again, and then the grounding of the starter conductor 224 'is again interrupted, and the associated blocked relay are de-energized in response to the start relay 205 having dropped out.



   When the supervisor has finished monitoring or releasing a connector, he sets his dial to the number 1 to make a connection with the next connector.



  When the rotating magnet 518 responds to this number, it advances the wipers a further step, and the relay 511 is again actuated in parallel with the rotating magnet. The action of relay 511 is during this time purely accidental.



   The supervisor watches the second connector and then puts his dial back to the number 1 in order to listen a third time for each connection and to release all the connectors which have unnecessarily remained in action. After the supervisor has moved the remote connector forward, fig. 5, until the last group of field contacts of the floor and monitored the local connector LC10, it releases the connec-

  <Desc / Clms Page number 62>

 remote control by removing the plug from jack J1, fig. 1. At the same time, it returns the adjustment key 116. When the plug is removed, the relay 111 drops out and opens the connection between the remote conductors and the earth%. its lower armature, after which line relay 506, fig. 5, and the '514 relay drops out.

   Relay 514 opens the circuit of relay 515, but relay 515 stays on for a while Relay 506 opens the circuit of relay 507 and sends another pulse of current to rotating magnet 518, after which the rotating magnet 518 advances the connector wipers leaving the last set of field contacts.



  Relay 511 is actuated in parallel with the rotating magnet and closes a multiple holding circuit for relay 515.



  A moment later, relay 507 drops out and closes the circuit of the coordinated release magnet, at the same time unblocking relays 509, 512 and 513 by interrupting the grounding of the blocking conductor 541. The The rotary magnet circuit and the relay circuit 511 are opened by the release relay 507 when it drops out, and the relays 511 and 515 drop out shortly thereafter.



   The connector is now fully released and can be used to make further connections.



   Referring now to fig. 7, the apparatus shown therein containing the force table PB and the various control relays will now be described. It will be noted that the batteries 711 and 712 supplying the bus bars 713 and 714 are supplied with charging current by the rectifier 707. The rectifier 707 is of the correct type with bulb,

  <Desc / Clms Page number 63>

 the bulb filament being supplied with lighting current connected to the upper right part of the transformer winding.



   In the normal state of the apparatus, as shown in the drawing, the marginal high voltage relay 1 726 is energized so as to keep the restraint relay 725 energized. The arrangement is such that the charge occurs each time a call arrives. It will be remembered that terminal 750 is the terminal through which current is brought to the open main conductor OMC common 9 all line connectors, such as LS, fig. 3. This power is supplied by the low winding relay 727. As a result, when a line connector is actuated, the relay 727 operates momentarily and opens the circuit of the relay 726. The relay 726 drops out and opens the relay circuit. 725.

   Relay 727, however, drops immediately and closes the circuit of relay 726, but as a result of its marginal adjustment, relay 726 does not work until the charging source has been switched on again to bring the voltage up to. the battery at its maximum, because, as we know well, a battery which does not receive a charge, has a lower voltage than a battery which receives a charge although the battery which does not receive a charge, is fully charged.

   When relay 725 drops out, it closes its upper contacts a circuit for heavy duty relay 705, after which relay 705 applies high current to the left winding of the transformer so that bulb 707 shuts off. 'alight

  <Desc / Clms Page number 64>

 and turns on to charge the battery. The battery charging current passes through resistor 708 which is in bypass with relay 709. Relay 709 is then actuated and opens the circuit of relay 724 before this relay is actuated following the closing of its circuit. 1 the inner frame of the charging start relay 725. The charging current is supplied first to the battery 711, and this battery receives the rectified current.

   Between the battery 711 and the battery 712 there is an impedance 710 which makes the current flow uniform and thanks to which the potential of the battery 712 remains constant.



   When the voltage reaches the required value, after a longer or shorter time which depends on the battery charge due to the action of the connectors after the action of the line connector, the marginal high voltage relay 1 726 is actuated again and closes the circuit of relay 725. Relay 725 is actuated again and opens the circuit of relay 705, at the same time opening another point of the circuit of relay 724. Relay 705 drops out and charging ends. Relay 709 drops out and prepares a circuit for alarm relay 724. The circuit remains in this condition until another call arrives, when the load is started again by relay 727.



     Assume now that a call arrives and relay 725 drops out, but the start of loading does not occur. This can happen as a result of a disturbance of the force network or in the bulb 727, or it would be

  <Desc / Clms Page number 65>

   possible that the challenges of relay 725 or transformer 706 are eaten away. Either way, if the start of the load *. ment does not occur, relay 709 does not work and relay pulley circuit 724 remains closed. When relay 724 is actuated (after a small interval) it closes a twinkle for relay 723, and then relay 723 is actuated and connects inverter 754 to earth.

   Conductor 754 is normally connected through the contacts of relay 732 to conductor 757, so that alarm relay 215 is earthed through this conductor and is then actuated, fig. 2.

   When the relay 215 is actuated it connects the starter conductor 224 'to the earth and prepares the stop of the researcher when the relay 213 is actuated by connecting the disconnected branch of the conductor to its inner lower armature. stop to the earth, and to its lower armature it prepares the application of the ringing current by the small capacitor co-ordinating to the upper conversation conductor, when the relay 214 is working.

   The relay type finder is activated as a result of the grounding of the starter conductor 224 '. and when relay 213 operates, it prepares a circuit for relay 214 which is closed as soon as the restraining conductor 231 is grounded to the lower contacts of relay 201.



   When the supervisor answers, he hears the distinctive signal produced by the application of the ringing current to the line by the small capacitor, which indicates to him that something is not in order on the force panel or in the

  <Desc / Clms Page number 66>

 one of the other equipment, as identified by the monitoring relays. In order to pinpoint the monitoring conditions at the S.A.M.X., the supervisor releases the service line in the usual way and takes one of the remote connections, for example the remote line TT1, and puts his dial to number 1.

   When the wipers of the TC1 remote connector reach the series of contacts "01", fig. 7, the grounding of the test wiper 602 by the upper winding of the switching relay 512, fig. 5, is applied to the test contact of the series, closing a circuit for the upper coil of relay 732, fig. 7 Relay 732 is activated and locks itself towards conductor 754 while simultaneously interrupting the earthing of conductor 757, so as to restore alarm relay 215, fig.2.



  The "0" stage contacts of the wiper 602 are in parallel with the "0" stage contacts (not shown) of the wiper 605, fig. 5. As a result, relay 513 now operates as previously described. The lower conversation slider 603 / is grounded by the field contact on which it rests, and the upper slider 601 meets a contact which is connected by the lower contacts of the relay 723 to the common ringing signal conductor 756 , in the event that the load alarm relays 723 are actuated as will now be assumed. When the supervisor hears the signal with the connector fitted to the contacts 01, he knows that the start of charging has not occurred, and a monitor can be sent to the S.A.M.X. to repair the fault.

  <Desc / Clms Page number 67>

 



   It may happen that another disturbance exists at the same time, and it is usually good for the supervisor to try the other disturbance numbers 02, 03, and 04, because a second alarm will not occur until the first fault has been repaired.



   To continue the tests; the supervisor simply puts his dial on number 1, so as to advance the wipers of connector 1 distance to the next series of contacts. The next set of options are associated with the 728 and 729 fuse alarm relays. If the unusible blows, the fuse contact springs make contact in the well-known manner with the fuse bus bar just below the main bus bar. 713, by closing a circuit to ground through the signal lamp 738 and the low winding relay 728. The relay 728 is actuated and activates the relay 729 which closes a connection between the signal conductor 756 and the corresponding field contact. in series 02 * The supervisor therefore hears the signal on this series if the fuse is blown.



   To try out the 03 series, the supervisor places his dial again on number 1, after which the connector wipers move forward a further step. Series 03 has been assigned to the M.D.F.



  In the event that one of the heat coils is melted as a result of a disturbance on the line, heat coil 731 for example, a ground has been applied to the associated common conductor by closing a circuit 1 the battery through. the signal lamp 739 and the relay 730. The relay 730 is / activated

  <Desc / Clms Page number 68>

 and closes a circuit for relay 731 which connects field contact 03 to signal lead 756. As a result, the supervisor hears the ring signal when the wipers are on contact series 03 in the event that a coil of cha - took up their post at MDF



   As for the contact series 04, it is coordinated with the signal release relays 733 736. Whenever a connector is released, the series monitoring relay 736 is energized by the fact that. the current for the release magnet is conducted through this relay and through terminals 753 as shown in several places in the drawing, fig. 3 to 6. Usually, relay 736 only operates momentarily and drops out as soon as the release operation has been completed. Occasionally a connector is not released properly and the release magnet circuit remains closed for too long? In this case, the relay 736 remains on for a sufficiently long time to generate an alarm in a manner explained below.

   When relay 736 is in action, it connects the lower armatures of relays 734 and 735 to earth through lamp 740. Relay 735 is energized from the receiving conductor through terminal 751, whenever the CG code generator , fig. 6, arrives at its receiving position. If relay 736 is energized during this time, relay 735 is blocked by lamp 740 and the lower armatures of relays 735 and 736.

   If relay 736 drops out before the device reaches its off position, relay 735 drops out and relay 734 is not actuated. However, if relay 736

  <Desc / Clms Page number 69>

 remains actuated, relay 734 is actuated by the upper contacts of rail 735 and by terminals 752 from the stop conductor when the code generator CG, fig. 6, arrives at its stop position. When relay 734 is on, it blocks itself by its lower winding in parallel with the lower winding of relay 735, and closes a circuit for relay 733. The lower winding of relay 735 has a relatively resistance. high, and the lamp 740 is not lit through this lower winding.

   The lower winding of relay 734, however, has a relatively low resistance, and the lamp 740 is now on. Relay 735 may or may not drop depending on its setting. The relay 733 connects the common signaling conductor 756 to the corresponding contact in the 04 series, with the result that the supervisor hears the bell signal, on this series of contacts when he brings the rubbers of the connector into engagement with it. Having made the necessary tests, the supervisor can now release the connector. It goes without saying that the remote connector TC2 can be used in a similar way.



   It will be noted that each of these relays 729, 731, and 733 is provided with contacts for earthing the conductor 754, in order to actuate the alarm relay 215, fig. 2, via the conductor 757 and the relay contacts 732, fig. 7. Note further that the relay 732 which keeps the alarm lead 757 disconnected from the lead 754 is blocked against the lead 754 so that in the event that the disturbance caused by the reset conductor earth 754 is

  <Desc / Clms Page number 70>

 eliminated or eliminated without further action, the earth of the conductor 754 is interrupted and the relay 732 drops out in a% way. be ready to generate the next alarm.

   The operator can try fixed intervals after an alarm has been given, to make sure whether the disturbance has cleared itself or not. Lamps 737, 738, 739 and
740 are provided so that the existing particular disturbance condition can be easily spotted when the fitter arrives. Key 722 is provided so that the electric trumpet 721 can be operated from conductor 754, as long as the disturbance condition exists. .



  This key can be operated by the fitter when he arrives, and it can be brought back again before he leaves in order to prevent unnecessary operation of the electric trumpet 721.



   Since the control of automatic connectors is usually carried out entirely through the service line, fig. 1, all of S. A.M.X. will be taken out of service in the event of a break in the service line or a fault that prevents it from being used. If all lines of service are broken, a supervisor can be sent to S.A.M.X. to operate the unit using the auxiliary unit shown in fig. 7, in a manner described below.



  If, however, the service lines break or become defective while one or both of the remote lines is intact, one of the remote lines may be used temporarily as a service line. Now assuming

  <Desc / Clms Page number 71>

 if the service line is defective somewhere between the two control units and the supervisor wishes to temporarily use line 1 remote TT1 as a service line, the supervisor at the local panel inserts the plug of a code circuit into the J1 jack, after what the remote connector TC1, fig. 5, is prepared to operate in the usual manner.

   The supervisor now sets his dial to number 09, after which the rubbers 601 to 605, fig. 6, are raised to the tenth stage of the field contacts and by turning are brought into engagement with the ninth set of contacts, referring to the lower right corner of fig. ., it will be noted that there is no multiple connection point between the contacts of "09" in the field of the wiper 602 of the TOI remote connector and the corresponding contact !: in the field of the wiper 602 'of the remote connector T02 , while which contacts "00" in the field of the test wipers of the remote connectors are connected together in multiple and are connected in multiple with the corresponding contacts in the field of the test wiper of the local connectors. The reason for this arrangement will be explained below.

   When the wiper 602 rests on its contact 09, the earth potential applied to the wiper 602 in the usual way by the connector has the effect of activating the relay 124 by its lower winding. The relay 124 blocks itself by the contacts of the relay 126 to its inner frame. To its upper frame,
 EMI71.1
 , r, TQ1X4X'.LrW rm.jüà ^ 7111x relay 124 closes a circuit for redo 122 and 121

  <Desc / Clms Page number 72>

 serial. The relay 121 disconnects the service line of the corresponding equipment of fig. 2, and the relay 122 disconnects the incoming conductors of the remote line TT1 from the remote connector TC1, fig. 5 and connects them to the service line equipment, fig. 2. When this happens, the remote connector TC1, fig. 5, is released in the usual way.



   In order to complete the switching, the local supervisor removes his plug from jack Jl so that the relay 111 can drop, and he operates the transfer key TK1, fig. 1, disconnecting the TT1 remote line termination equipment at its lower contacts and cutting the service line equipment at its upper contact of the faulty service line to bring it into connection with the line remote TT1. The complete transfer of the TT1 remote line to the position previously occupied by the service line, which is currently defective, has been carried out and calls can now be processed through the TT1 remote line as a back-up service line.



   When the supervisor wishes to put the service line back to normal use, he can use the other line remotely and adjust the remote connector 1 TC2 so as to bring it to its "00" contacts, after which relay 126 is actuated by test wiper 602 'and unlocks relay 124. By this operation, the end of SAMX of the service line and the TT1 remote line is switched back to the normal state, while the supervisor

  <Desc / Clms Page number 73>

 takes care of the manual service end by returning the TK1 transfer key to normal.

   If the TT2 remote line is not available to perform the switchover operation, the monitor can use one of the local connectors. This is done by first setting, by means of the dial, the first connector through which a call is made, to contacts "00" to actuate relay 126, and by advising the calling subscriber to hook up his call. receiver and call again later.



  Alternatively, the supervisor can actuate the bell control key 176 at its position, after which the associated relay applies the bell current to the conductors of the service line, now connected to the line. distance TT1, so that the ringing current is transmitted by the repeater coil shown in fig. 2 to the TLS test line connector. This line connector is actuated and puts one of the local connectors into operation, after which the service line is automatically connected to this connector in the usual way, and the supervisor adjusts this connector by means of the dial to contacts "00 ", thus activating relay 126, fig. 1. The service line is thus transferred back to the end of the S.A.M.X., and the supervisor returns the transfer button TK1, fig. 1.



  The supervisor can now press key 176 again, and send the ringing current through the service line and thus free the test line connector and the actuated connector. It is mentioned that the supervisor can

  <Desc / Clms Page number 74>

 operate the test line connector at all times to produce a call and thus examine the action of the equipment to determine whether the job is correct or not.



   Assuming now that all lines are broken between the main plant and S.A.M.X., for example after a hail fall or after a severe storm, a supervisor can be sent to S.A.M.X. to operate the devices. When arriving at the S.A.M.X., the supervisor operates the emergency button EK, fig. 1, so as to transfer the end of S.A.M.X. from the service line to the emergency unit shown If fig. 7. as a result of this operation of the key, the calls arriving on the service line enter the emergency group, the line relay 703 being connected by the contacts of the answer key and the release to the simplex driver of the extended service line.

   When a call arrives, relay 703 is actuated in series with pulse relay 202, fig. 2, turning on the associated call lamp * When the emergency attendant responds by placing his key to the answer position, the simplex setting conductor is transferred to the CD3 calling device, and the relays 701 and 702 are actuated. a manner corresponding to the action of similar relays re. shown in fig. 1 and normally coordinated with the service line. The supervisor checks the connectors in the usual way, and releases the equipment from the service line by placing the key in the released position.



   As a precaution for the service of eight, when the supervisor may be temporarily absent, key 704

  <Desc / Clms Page number 75>

 can be actuated, in which case the electric trumpet 721 is actuated when a call arrives at the lower contacts of the line relay 703, so that an aoustic signal is produced.



   After the lines have been located, the emergency group is disconnected and the regular service line is connected, after the EK button has been returned to the normal position, fig. 1.



   Referring now to fig. 2, it should be noted that the arrangement is such that the relay type finder does not leave its normal position to start the search in the event that there is one or more calls waiting for a connection to be released between the line. and the local connector. Instead, the blocking conductor 219 is kept connected to earth by the start relay 205, so that the endless chain action of the interconnected relays 206-213 begins again.

   It will be pointed out to point out here that the seeker is arranged so as to move, for his search, from the tenth connector towards the first connector, instead of a movement in the opposite direction which would appear to be more natural in consideration of the purely arbitrary direction, in which the search takes place in the main switches of normal construction. The searcher searches for connectors in the same direction as the main switch. This ensures that the calls are handled as much as possible in the following order

  <Desc / Clms Page number 76>

 which they arrive at the central.



   Referring now to Figs. 2 and 3, the explanations of a special arrangement in connection with the relay type finder shown in FIG. 2. It will be remembered that the researcher has to start and establish the connection with a local connector, such as the local connector LC1, in response to the action of relay 307 and that relay 308, by interrupting the connection. Grounding of conductor 222, produces such conditions in the circuits, that the finder does not start again on this connector until it has been released and gripped again. It is therefore understood that it is very important that the relay 308 work in all cases so as to allow the finder to operate properly without interference from the actuated connector.

   Despite the dual circuit arrangement provided to operate relay 308, it may occasionally happen that this relay or one of the other similar relays in another connector does not come into operation, for example due to the fact that the windings are burnt u that the contacts are not clean. In order to minimize the effect of such a condition, the relay 204, fig. 2, to open a point in the circuit of relay 201 in the event that conductor 220 remains grounded from a branch conductor, such as 222, after the corresponding connector has been actuated.



  If the relay 204 remains in action, by the fact that the conductor 220 is still earthed, the relay 201 may drop out when the relay 203 is brought back to normal, and

  <Desc / Clms Page number 77>

 the seeker can perform his action until the relay 204 drops out and again connects the conductor 220 to the relay 201. During this time the conductor 220 will have been disconnected from the faulty branch, such as 222, by the resetting the corresponding relay, such as 207, to normal, and the searcher can continue his action and establish the connection with a connector other than the defective one.



  The faulty connector will naturally be a source of trouble, because the finder will stop on it again as soon as it has reached that point again. But this arrangement at least prevents the plant from being completely useless as a result of this defect, while the latter is being repaired.



  * Since relay 204 must be slow acting, so that it can remain in action long enough to allow the next group of relays to be actuated and to restore the normal position of the previously actuated pair, it can happen that the finder be advanced through more than one group of relays before relay 204 drops out and allows the stop operation to occur.



  In order to avoid the need for a critical adjustment of relay 204 and at the same time to allow the finder to ordinarily stop on the connector which is next in sequence, relay 204 is energized from conductor 220 with the result that it will not be excited and will not interfere with the action of the researcher, with the exception / rare cases where the conductor 220 remains connected to earth as previously indicated.


    

Claims (1)

Claims. EMI78.1 ****************************** 1. Telephone installation, characterized in that it comprises a central, in which connections are established by a supervisor placed in another central, in which a call is produced by the transmission of alternating current from the substation , this current activating a connector performing a forward movement to connect the calling line IL a connection line and a connector performing a retrograde movement to connect the selected connection line with the place of the supervisor. 2. Installation according to 1), characterized in that the alternating current is transmitted from the substation in a loop circuit. 3. Installation according to 1), characterized in that in the central where. the supervisor stands, a non-digital connector is activated on a call from a substation to grab a connection to a first digital connector. 4. Installation according to 1), characterized in that the connection is automatically established with the monitored central when a subscriber makes a call, the supervisor in this central being notified automatically, in the event that a fault occurs in the local central. , in the same way as when a call is made. 5. Installation according to 1), characterized in that the <Desc / Clms Page number 79> The supervisor of the monitored central is automatically notified if there are no connectors available for a calling subscriber, in the same way as when a call is made. 6. Installation according to 1 - 3, characterized in that the release of an established connection is carried out automatically after a predetermined time. 7. Installation according to 1 - 5, characterized in that an acoustic warning signal is given a predetermined time before the forced release is carried out. 8. Installation according to 1 - 3, characterized in that the arrangement is such that, as soon as a connection has been completely established, the supervisor is automatically disconnected from it. 9. Installation according to 1 - 3, characterized by an arrangement such that the release of an established connection can be effected by the calling party or by the called party. 10. Installation according to 1 - 3, characterized by an arrangement such that the release of connections established through the station of the supervisor is carried out by the supervisor. 11. Installation according to 1 - 3, characterized by such arrangement that the release of a connection is effected in response to the subsequent transmission of alternating current through the line. 12. Installation according to 11), characterized by an arrangement such as the release of established connections <Desc / Clms Page number 80> through the supervisor's station is effected by interrupting a simplex circuit going to the local control panel. 13. Installation according to 1 - 3, characterized in that the connector actuated during the transmission of a call is of the preselector piston type 14. Installation according to 1 - 3, characterized by an arrangement such that the supervisor is automatically notified as soon as there are no more connectors available to the local control panel to establish connections. 15. Installation according to 14), characterized by such arrangement that the warning of the supervisor is delayed until the last connection is completely established. 16. Installation according to 14), characterized:.: By an arrangement such that the supervisor is able to establish a conversation connection with each of the connectors of the local control unit, whether occupied or free. 17. Installation according to 16) characterized by an arrangement such that an occupied connector is released under the control of the supervisor. 18, Installation according to 17), characterized by an ar-, arrangement such that the release of the final selector is effected by opening a point in one of the conductors of the connection line. 19. Following installation 1-4, characterized by an arrangement as it is supervisor is able to determine the nature of a fault that has occurred by choosing one or more digits. <Desc / Clms Page number 81> 20. Installation according to 19), characterized by such an arrangement as the setting to a digit indicating the fault prevents a fault condition from being reported again to the supervisor until the fault is detected. 21. Installation according to 1-3, characterized in that a supervisor station is provided in the local central, from which calls can be established in the event of an interruption of the connection with the main central. 22. Installation according to 1 - 3, characterized by an arrangement such that in case the connection line from the supervisor's station to the local central, by which the establishment of connections is normally controlled, is out of service, the supervisor is able to control the establishment of connections by way of a connection line between the central units normally serving the conversation. 23. Installation according to 22), characterized by an arrangement such that the transmission of a particular digit by way of a connection line causes the connection of the latter instead of the service line, while the transmission of another particular digit restores the normal state. 24. Installation according to 22), characterized by an arrangement such that the substitution of a connection line used for conversation, for the service line, requires circuit modifications at both ends, those at the end of the supervisor. being carried out by a hand maneuver on the part of the supervisor, while those to <Desc / Clms Page number 82> the far end are generated in response to the selection of a special number. 25. Installation according to 1), characterized in that the connector with retragrade movement consists only of relays. 26. Installation according to 25), characterized by an arrangement such that the release of the connector is performed by the supervisor. 27. Installation according to 26), characterized by an arrangement such that the connector is actuated in response to pulses received from a switch. 28. Installation according to 25), characterized in that the connector has a normal position in which it returns if there are no calls waiting for the connection with the supervisor, while in the event of successive incoming calls - without intervals it continues its action, so as to move away from the position in which it was used the last time. 29. Installation according to 1 - 5, characterized by such an arrangement that the adjustment of the automatic connectors under the control of the supervisor is carried out by the impulse transmission in a simplex circuit. 30. Installation according to 1), characterized by an arrangement such that a single cycle of a code ringing current is transmitted to the called party, the ringing current generator then being automatically disconnected. <Desc / Clms Page number 83> 31. Installation according to 30), characterized by an arrangement such that each code ringing current cycle is preceded by a bell of longer duration than the bell ringing forming the code.