BE432817A - - Google Patents

Description

       

    <Desc / Clms Page number 1>
 



  Improvements to automatic connectors used in telephone or other systems.



   The present invention relates to telephone systems and more particularly to a system having separate establishment and conversation circuits, in which despite the reduction in the cost of the switching members a considerable number of connection circuit possibilities are available. and the . number of possible simultaneous conversations is high.



   In addition, the system allows a very large number of simultaneous conversations without requiring complex switching devices to be provided especially for this purpose.



   The invention is particularly advantageous when used with selectors of the type with transverse bars or with coordinated movements of the kind described in the book entitled "Die Fernsprechanlagen mit Wahlerbe- trieb by Lubberger 1935 ed 3 (figs. 43 and 121 .)

  <Desc / Clms Page number 2>

 
According to one characteristic of the invention in a telephone system, pulses transmitted by a calling station are used to establish a communication to a called station by a channel distinct from that used for the conversation, the latter then being established by the operation of connectors to digital selection using pulses transmitted by the called station.



   According to another characteristic of the invention in a telephone system, a calling line is automatically extended to a free supply circuit and forming part of a group of several supply circuits, this circuit then being connected by a connector to automatic selection to a digitally-selected connector which responds to pulses transmitted by the caller, the position of the auto-selectable connector serving to control the automatic transmission of pulses from the line of the called station to establish a talk circuit to the caller circuit food chosen.



   According to another characteristic of the invention in a telephone system, pulses transmitted by a calling station are used to establish a communication with a called station by a channel distinct from that used for the conversation, the latter then being established by digital selection by means connectors of the type having several lines both incoming and outgoing so that several communications can be established through them and simultaneously.



   According to yet another feature of the invention in a telephone system having communications

  <Desc / Clms Page number 3>

 established for conversation by connectors of the type having several lines both incoming and outgoing so that several 'communications can be established simultaneously through them, a marking device associated with each connector is combined to be actuated and come into contact with a particular outgoing line following, of a pulse train and if this line is busy, the communication will be routed to an auxiliary connector and from there to a free outgoing line common to several different dialing lines.



   The invention will be better understood from the following description of an embodiment shown in the accompanying drawings.



   The invention, in its embodiment described, uses selectors with coordinated movements of the type shown in FIG. 44 of Lubberger's book indicated above, these selectors being used as conversation selectors. These selectors have multiples of rods and multiples of bridges that interconnect with each other at the points where they intersect.



  The rod multiples are controlled by the rod electromagnets and the bridge multiples by the bridge electromagnets. The selector can include ten to twenty bridging multiples and a corresponding number of bridging electromagnets since to each bridging multiple corresponds a bridging electromagnet.



  In the attached drawings, the bridging multiples are indicated by lines. The number of bridging multiples can be determined depending on the traffic intensity by the section in which the selector is used.



  Each of the bridging multiples is served by bridging electromagnets associated with a bridge whose

  <Desc / Clms Page number 4>

 operation prepares and activates as many contact springs as there are multiples of rods in the selector. Selector rod multiples are indicated by vertical lines in the accompanying drawings.



  Each selector has ten rod multiples which are controlled by five rods by ten rod electromagnets. Each rod rotates either to one side or the other under the action of one of the two rod electromagnets so that for each rod there can be for up to twenty different multiples prepared / operating and corresponding to the number of bridging multiples. Since each of the bridges placed horizontally and each of the rods placed vertically forming the same selector can be operated separately, it is possible to carry out several communications simultaneously by the same selector, and as in the current case there are ten mul- horizontal multiples and ten vertical multiples, ten simultaneous connections can be established.

   If the selector has twenty bridges, then ten incoming lines terminating in the horizontal multiple field of the selector may be connected with ten outgoing lines terminating at the bridging multiples of the selector such that (each multiple of rods allows one to perform a selection from twenty lines The connection between incoming and outgoing lines can be made in such a way that the incoming lines are connected to a multiple of bridging and the outgoing lines to multiples of rods.



   When the selector is put into operation a rod controlling a multiple of rod rotates first and then a bridging electromagnet is energized. In this way the contact springs at the intersection of the corresponding rods and bridges are actuated and remain

  <Desc / Clms Page number 5>

 in working position after the rod returns to its original position.



   The present invention relates to circuits for actuating a particular rod and to bridging electromagnets.



   Figs. 1 and 2 represent a diagram of establishment of a particular call.



   Assume that there are 8000 subscribers or 7000 subscribers and 1000 trunk lines from other offices.



  These lines end at 8000 bridge multiples of the first preselectors.



   The grouping of the individual selectors can then be combined so that each selector is considered as a frame of several selectors together forming the same frame. By linking together the rod multiples of the individual selectors, selector racks can be formed and have up to 100 bridge multiples. Therefore series or parallel circuits can be obtained for the corresponding rod electromagnets. If, however, the individual selector racks each include 80 bridges (80 subscriber lines) then four preselectors must be combined per rack and have their rod electromagnets connected to each other.

   In fig. 1 such an arrangement of a frame of preselectors is shown schematically and the preselectors IVWa and IVWb represent two interconnected selectors of this kind whose multiples of rods are connected by the distribution wires V. Selectors having a large number of bridges can also be connected together. In this case, however, the control rods are elongated since they must extend over the height taken by

  <Desc / Clms Page number 6>

 80 bridge multiples.



   A communication between subscriber station A (No. 1234) and subscriber station E (No. 7629) is established as follows: when the subscriber of station 1234 picks up his receiver a multiple of free rods which is expands on the selectors IVWa and IVWb is first prepared by the fact that the rod electromagnet of the corresponding rods is excited. In this way, the access which is presented by line L9 is free. Then the energization of the bridge / line electromagnets of subscriber L20 of subscriber 1234 takes place. The contact springs of the bridge 4b indicated in the selector IVWa by a small circle are closed. The bridge electromagnet remains energized as long as the rod electromagnets are not connected.

   It is not necessary to energize the rod electromagnets in the two selector switches but it is only necessary to energize a single rod electromagnet of the IVWa selector since the calling line is connected to a bridge multiple of this selector. This, however, depends on the distribution of the pulse circuit.



   The line coming out of the stem multiple 4st of the IVWa and IVWb selectors gives access to two bridge multiples through the ul contact and in this case to the bridge multiple (76b) of the second outgoing preselector IIWab3 and to the bridge multiple (75b) of the second incoming preselector IIVWan3. Since the present case relates to the establishment of an outgoing communication, the connection by the contact ul sa is shown * in its normal position which establishes the link with the bridge 76b of the selector IIVwab3. The connection is extended by the 73st rod multiple to the Spll3 supply bridge. The feed bridge provides the feed current for the calling subscriber from subscriber station 1234.

   It has

  <Desc / Clms Page number 7>

 There are separation capacitors and a supply bridge for the incoming side (subscriber 7629). In addition, the calling units serving for the calling subscriber are combined in the supply bridge, and this Spl13 bridge also serves as a pulse repeater.



   The 8000 subscriber line bridging multiples are connected to the first 100 preselectors of the first preselector racks each of these preselectors having 10 outgoing lines, i.e. having 1000 outgoing lines in all. These outgoing lines lead to 1000 outgoing bridge multiples and 1000 incoming bridge multiples of the second preselector. On the second floor preselector forty incoming selectors and forty outgoing selectors with coordinated movements are provided.



  Each of these selectors has twenty five bridge multiples. It follows that since each selector has ten stem multiples ,. 400 feed bridges numbered 100, 101 through 499 are connected to the rod multiples of the second outgoing preselector. The stem multiples of the incoming second preselectors again lead to forty first group selectors which have a total of 400 incoming lines. The power supply bridge Spl13 entered, in the case of the communication described, is indicated by the number "113".



   After the power supply bridge has been grasped, the AS searcher searches for it and takes up position on line L11. This position of the seeker is retained by the ABW switching mechanism which is not shown in detail. The AS seeker connects the elements constituting the circuit for establishing the communication and consists of a selector of the type / with movements of ascent and rotation.

  <Desc / Clms Page number 8>

 



   The calling subscriber receives the invitation to transmit tone from the first group selector in the call setup circuit. This is indicated by EIGW. The calling subscriber then actuated the first group selector EIGW; the second group selector EIIGW and the final selector ELW in the known manner by forming the number 7629 of the desired station E in the usual manner. After the final ELW selector has been actuated pulses are transmitted for the bridge multiple indicated by 104b corresponding to the subscriber 7629 connected to the first preselector IVWe. A free multiple of rods of the IVWe preselector is prepared, for example the multiple of rods indicated in fig. 1 by 92st.

   Contact u3 is actuated and connects a bridge multiple of the second incoming preselector (IIVwan2).



  The entered bridge multiple is shown in fig. 1 in the IIVWan2 preselector by 26b. Pulses are sent to a multiple of tigēlibre, for example the multiple of rods 72st which through line L14 gives access to the multiple of rods st81 of the IGW group selector.



  The number of this multiple, for example 315, is not very important.



   The talk circuit consists of three stages of selectors IGW, IIGW and LW, each of which is assigned a digit. The forty second incoming preselectors give access to 400 outgoing lines since each of them has ten multiples of stems these outgoing lines leading to 400 multiples of stems of the first group selectors. The multiple of rods used for the described communication is indicated by 315. The system shown requires 40 first group selectors having 13 to 15 multiples of bridges.

  <Desc / Clms Page number 9>

 



   In the first group selector the connection to a supply bridge of the supply bridge group from 100 to 199, namely that indicated by 113 is to be established. An IBZ marking selector associated with the IGW group selector will turn after entering the multiple of rods st81 from the IGW group selector.



  In this way pulses pass through the settling circuit to return to the ABW input mechanism of the finder AS. By its first rotation the gripping mechanism finds the first number, namely the number 1, of the feed bridge characterized by 113 and consequently the marking selector IBZ is maintained in its position 1. Position 1 of the broom aZl of the IBZ marking selector leads to two multiples of bridges, two selectors of IGW groups, which are connected to the group of supply bridges from 100 to 199. The connection to these multiples of bridges is due to the brl contact. When the left multiple of bridges is free, the bridge solenoid is actuated so that the connection is made through the point of intersection of the IGW selector indicated by a small circle.

   In this way the connection is routed through line L22 to a multiple of rods of the second group selector IIGW. The IBZ marking selector is therefore free and can establish another communication. A communication which would also be linked from the second incoming preselector to a multiple of rods from the first group selector would only have to wait until the selector IBZ marking which is associated with the group selector is released from the connection indicated above.



  Since the marking selector as soon as it has established the connection through the point of intersection, immediately returns to its normal position and is

  <Desc / Clms Page number 10>

 is ready to immediately establish another call, only a very short waiting time is necessary. The sending of pulses from the ABW input mechanism only begins as soon as the connected marking selector is in its idle position. The layout of the second group selector is exactly the same as that of the first group selector. After entering one of the multiple of rods the marking selector IIBZ is connected when it is free to the entry mechanism ABW and determines / together the second digit 1 of the number 113 of the supply bridge Sp113.

   The left-hand bridge multiple of the second group selector IIGW is connected to a line indicated by the number 110 - 119 through which the communication is routed to a bridge multiple of the final selector whose rod multiples are connected with the bridges power supply indicated by 110 to 119. In the final selector the IIIBZ marking selector is then connected. This in conjunction with the ABW input mechanism determines the third digit 3 of the number of the power supply bridge Sp113.

   The rod electromagnet of the multiple of rods 113st and the bridge electromagnet of the multiple of bridges seized giving access to the multiple of bridges 89b are then energized, the selector IIIBZ is then released and the electromagnet of rods from the multiple of rods 113st is then released. The requested line 7629 is connected to the power supply bridge Spl13 seized by the subscriber line 1234. The current then flows to the subscriber station 7629 the circuit setting through the ascent and rotation selector then being released.



   IHGW and IIHGW auxiliary unit selectors shown in fig. 1 are combined as follows: each of the first forty group selectors can be

  <Desc / Clms Page number 11>

 serve ten communications since each of these selectors have ten associated rod multiples. Of each group selector of the first group selection stage only two channels lead to each group of one hundred feed bridges; thus for example two lines lead to the group of feed bridges from 100 to 199 and two lines lead to the group of 'feed bridges from 200 to 299, etc.

   In order, however, to increase this number of lanes, assuming that these lanes are not sufficient to carry existing traffic and that more than two lanes must lead to a group of one hundred feed bridges, each group selector can be fitted with other multiples of bridges which are not numbered in addition to the 8 multiples of bridges already numbered. These are indicated at the IGW selector in fig. 1 by b500 to b504. In the first group selector, not shown, five sets of unnumbered bridge multiples are included and it is understood that they may be more or less.



   When for example a third communication is routed to the bridge 100 to 199 the IBZ marking selector first determines which of the two multiples of bridges indicated by 100 to 199 will be entered. A pulse is then transmitted by the second brush bzl of the marking selector IBZ to the contacts kl, k2, k3, k4, this chain of contacts is placed on the first multiple of free bridges of the extension multiples of the selector IGW.



  This extension therefore fulfills the function of a third preselection stage. In fig. 2 this extension is indicated by IIVW. Via a multiple of bridges of this extension, for example, via the multiple 'of bridges b500 the incoming line L14 is then connected to a multiple of rods ///

  <Desc / Clms Page number 12>

 an IIHGW auxiliary group selector. When the communication has been routed through the multiple of rods 99st of the IHGW selector, the operation of the IVB2 marking selector takes place. This marking selector takes the desired number 1 from the marking selector IBZ because the selector IB2, returning to its normal position, transmits the pulses to the marking selector IVBZ.



  The ten-step deposit selector reaches the contact marked 1.



   From the IHGW auxiliary group selector, two channels also lead to the group of one hundred supply bridges, in this case two channels give access to group 100 to 199, and two channels to group 200 to 299. The bridge multiples of the selector Auxiliary groups IHGW are extended to the rod multiples of the second group selector provided for the establishment of normal communications by which communications can be routed in the normal manner. The lines exiting the auxiliary group selectors can however override the group selectors as is the case for example for line L25.

   When the communication from the first group selector IGW via the multiple of bridges b500 is connected only by the multiple of rods 99st and / the multiple of bridges is extended by the line L26 to the multiple of rods 105st of the second selector of groups IIGW, the communication can be routed directly to a final selector if the multiple of bridges which is connected to the group of supply bridges from 110 to 119 is free.



  However, if the multiple of IIGW selector bridges provided for group 110 to 119 is already engaged, an auxiliary connection circuit will be prepared and will go through the auxiliary extension multiples of the IGW group selector which are indicated on the plans by IVVW .

  <Desc / Clms Page number 13>

 



   By the second brush of the marking selector IIBZ, the chain of the contacts k5, k6, k7 is connected when the multiple of bridges 100-109 of the selector IIGW is occupied and a free multiple of bridges can therefore be obtained.



  If the multiple of bridges indicated by b601 is free the communication is routed by line L27 to multiple of rods 107st and an auxiliary group selector IIHGW. The VBZ marking selector is then entered and receives the second digit by the IIBZ marking selector in order to mark the desired supply bridge. The selector IIHGW therefore connects the multiple of bridges 91b of the final selector LW via the line L28.

   The marking selector IIIBZ of the final selector LW receives the third pulse train needed to determine the feed bridge, through the input mechanism ABW and switches to the multiple of rods 113st of the final selector LW. The connection of the station E of the called subscriber is therefore allocated by means of the derivative bridges IIIVW and IVVW and of the auxiliary group selectors IHGW'and IIHGW to the power supply bridge Spl13.



   With regard to the number of conversation selectors used the following remarks are relevant: Since the co-ordinated motion selectors forming part of the conversation circuit have ten multiples of stems, when four hundred group selectors are provided there are four hundred lines entering the first floor of group selection. Each group selector has eight multiples of numbered bridges such that the first group selector of the system shown has 320 multiples of numbered outgoing bridges. These 320 outgoing lines of the 32 group selectors are connected to 32 second group selectors.

   Further with regard to the multiple of rods of each selector of groups five

  <Desc / Clms Page number 14>

 Auxiliary output connections, for example, are provided (multiples of III, VW bridges) such that the first group selection stage has two hundred unnumbered outgoing lines in addition to the 320 numbered outgoing lines. These 20D outgoing unnumbered lines can give access to the first twenty selectors of IHGW auxiliary groups. Each first auxiliary group selector has eight numbered bridges such that by providing twenty first auxiliary group selectors 160 outgoing lines will pass through the multiples of bridges.



  These outgoing lines can be connected to 16 IIG group selectors (16) Depending on the intensity of the traffic, however instead of these 16 second group selectors which are accessible from the first auxiliary group selector, second group selectors can be planned and be used for normal traffic. The IIGW group selector (32) in fig. 2 is shown for example in a circuit of this kind. The lines (L26) exiting from the first auxiliary group selector IHGW are mixed in some way with the lines (L22) exiting from the first group selector IGW. The system therefore has 48 selectors on the second group selection stage each having ten multiples of stems and therefore 480 incoming circuits.



   Each second group selector has ten multiples of numbered bridges such that 480 bridges are connected to the final selectors. In addition, each second group selector can be provided with four multiples of auxiliary points (IV (VW), for example; which 192 auxiliary lines L27 are accessible. These 192 lines are connected to 20 auxiliary group selectors, each with 'them having ten multiples of bridges

  <Desc / Clms Page number 15>

 The 200 multiples of bridges of the second selected auxiliary group also result in multiples of final selector bridges so that for the whole system 680 multiples of bridges can be provided on the final selectors stage. Each final selector is connected to ten feed bridges by its multiples of rods.

   The feed bridges are therefore connected to 40 final selectors so that the number of multiple bridges of each row selector must be fixed. at 17 (40 x 17: 680).



   It can be seen from what has been indicated above that of the 400 multiples of rods entering to the first group selectors, 680 circuits result in 400 Sp feed bridges. In this way a very large overload of the connection circuits is possible and any congestion becomes improbable.



   A group selector can give up to ten communications by its ten multiples of stems. In this way each group selector gives access by two multiples of bridges to one of the four groups of feed bridges. Since 400 groups of feed bridges are assumed to exist, eight communications can be made to the feed bridges. In addition, five other .multiples of unnumbered bridges exist and provide access by auxiliary group selectors to supply bridges. If certain multiples of unnumbered bridges are connected to the individual group selectors, auxiliary group selectors may be added in case of congestion.



   Each group selector has only one marking selector associated with it. It follows that a communication which results in a multiple of stems

  <Desc / Clms Page number 16>

 of the group selector must wait a very short time until the marking selector is free. Since 40 group selectors are provided, up to 40 communications can be established simultaneously. For a system of 8000 subscribers this number is very high. In the second group selector stage 48 group selectors are provided in order to be able to establish 48 communications simultaneously. In the final selector it is possible to establish simultaneously 40 communications.



   This number of communications which can be established simultaneously is too high for the normal operating requirements of a system of 8000 lines. An 8,000-line network has about 12,000 hours of traffic, that is, three to four calls per second. Since the tagging selector is connected for a maximum of two seconds to a conversation selector, eight communications may occur during such a period.



  If consequently the organs for the simultaneous establishment of twenty communications are provided, the peak of simultaneous establishment of communications will be ensured.



  Therefore in practice two conversation selectors can be associated with a single marking selector.



  The change which would result from this compared to the embodiments shown would consist in that the energizing chain of the KOP relay (see fig. 9 and 10) would pass through the multiples of soft selector rods, that is to say by 20 multiples of stems.



   By the momentary association of the tag selector and the talk selector by which the tag selector receives the pulse from the multiples of bridges or rods, things have been combined so that each talk selector can

  <Desc / Clms Page number 17>

 serve multiple conversations at the same time.



   Another advantage of the invention is that the desired feed bridge, to which the calling station is connected, is always free for the selector at the final selector stage so that the test of the feed bridge which is to be connected by the final selector stage selector should not be executed and no time should be allowed to perform this test.



   Some other provisions may be added to the general provision indicated above and will be indicated below. Thus, for example, the second preselector has 25 access devices with ten outgoing lines only. Consequently, if the ten outgoing lines are occupied, the fifteen other access devices must be kept upstream of the second preselector.



   In addition, the arrangement shown above only indicates preselectors of up to 80 subscriber bridges, the remainder constituting a bundle of ten outgoing lines. It is possible according to the invention to arrange for the outgoing lines to be staggered in their connection to the second preselector. Finally (fig. 14 and 15) the possibility of using the known scaling principles is shown.



   Instead of the finder who serves to establish the connection circuit, it is understood that -, preselectors can also be provided since by their position it is possible to determine the selection number or marking number of the bridge d. power supply to be connected. The number of connection circuits which can be established by these preselectors or by the researchers represented for the selection of calling subscribers is assumed to be 40 since according to the possibilities indicated above 40 calls can be established simultaneously.

  <Desc / Clms Page number 18>

 



   Figs. 3 to 17 represent an embodiment of the circuits. In these figures the connections of the multiples of rods are horizontal and the connections of the multiple bridges are vertical. At the intersection of these horizontal and vertical multiplet connections a small circle indicates a set-up contact which is closed by the rotation of a rod thanks to the rod electromagnet and the excitation of an electromagnet of bridge. All co-ordinated motion selectors are assumed to be four-wire selectors.



   Certain parts (for example the relay C113, Allô of the power supply bridge Spl13) are represented in various plans so that the interpretation of these can be simplified. The current circuits themselves are simplified compared to the realization, certain details not being understood, as for example, the guard of an access circuit when its fuse is burnt or the diverted passage of certain parts which would be. disturbed.



   Figs. 3 and 4 show four first preselectors having the references IVWa, IVWb, IVWc and IVWd, mounted on a single frame, each preselector having ten multiples of rods, two of which are shown. Only the arrangements of the IVWa and IVWd preselectors are shown in detail since the IVWb and IVWc preselectors are identical. Each of the preselector has twenty bridge multiples of which the Br10 and? .R29 bridge multiples are represented in the VWa preselector.

   For the VWd preselector two multiples of bridges are also shown and carry the number Br70 and Br89. Since each of the preselectors has twenty multiples of bridges, 80 multiples of bridges and therefore 80 subscribers can

  <Desc / Clms Page number 19>

 be linked to the four preselectors connected together.



  The interconnection of the other preselectors on a single rack is accomplished by connecting the multiple rod system as shown in the plans. Rods extending over 80 multiple of bridges to control the multiples of rods would be too long and too heavy. However, it is quite possible by a special construction and special rod holders to realize selectors in which the rods involve more than twenty multiples of bridges.



   Of the 80 subscriber stations which are connected to the first four selectors shown, four are indicated by the numbers T10, T29, and 170, T89. The IVWa preselector rod electromagnets are indicated by ST11, ST12 to ST10. The VWa preselector bridge electromagnets are indicated by BM10 to BM29. Of the VWb and VWc preselectors, only the rod multiples have been shown.



  From the VWd preselector the Br70 and Br89 bridge multiples are indicated and are controlled by the bridge electromagnets BM70 and BM89. VWd selector rod multiples are actuated by rod solenoids.
T ST41, ST42 to ST40. Stv11 and Stv12 represent the two multiples of selector rods IVWa which are connected to the multiples of rods STv41 and STv42 of selector IVWd.



   The preselectors of subscribers T10 to T89 have, as is clearly indicated in fig. 1, access to the second incoming and outgoing preselectors through the switching point ul. In fig. 5 and 6 such a switching point is. shown with outgoing and incoming preselectors indicated by IIVWab and IIVWan. In these preselectors only two of the ten rod multiples are shown.

  <Desc / Clms Page number 20>

 
 EMI20.1
 The two rod multiples of the IIVüab selector lead to the Spll3 and Spll2 supply bridges (fig. 7).

   Of the bridging multiples of the second outgoing preselector (IIVt'dab) only two are shown and. This fact the mul- tiples of bridges which are actuated by the electromagnets are
 EMI20.2
 of bridges / B1, \: 90 and Bv9l, The solenoid of rods ST221 is associated with the multiple of rods which ends at the power supply bridge Spll2 and the solenoid of rods ST222 is associated with the multiple of rods which ends at the feeder bridge
 EMI20.3
 Spll3 tation.



  The electromagnets 1-ill and M21 are electromagnets connected to the chain and prepare the following free multiple of rods of the first preselector that will be used. The M11 electromagnet (fig. 5) has a
 EMI20.4
 contact mlll "Lig. '5) and the electromagnet M21 has a contact m211 (fig. 3 in the left corner); It is., to be noted that the reference number of the contacts shown on the plans in the case of A two-digit contact number consists of the first digit indicating the corresponding relay or electromagnet and in the case of the three-digit number the first two digits correspond to that relay.

   Contacts numbered8 with a single digit correspond to a relay that has no reference, or in the case of contacts numbered by four digits, the first three digits correspond to the associated relay.



   In fig. 3 and 4 each sub-group of twenty subscribers has an associated common relay which can be actuated via the individual call relays
 EMI20.5
 individual subscriber sets of the sub-group. The common relay for the subscriber sub-group from T10 to T29 is indicated by TB10, for the subscribers of the sub-group from TSO / 1 to T49 by TB30, and for the subscribers of the T50 sub-group

  <Desc / Clms Page number 21>

 to T69 by TB50 and for subscribers of sub-group T70 to T89 by, TB70,
Another common relay BL is associated with the four sub-groups of the groups of connection lines consisting of 80 subscriber connections, the effect of the intervention of this relay being given in detail below.



   During the establishment of a communication between the subscriber T10 and a subscriber T29 the following operations take place;
It is assumed that the telephone number of subscriber T29 is 7629.



   When the subscriber of set T10 (fig. 3) picks up his receiver, the following circuit is established: positive, contact bml02, loop of subscriber T10, contact bmlOl, relay R10, negative. Through this circuit, relay R10 draws. The RIO relay by attracting establishes through its contact r102 the following circuit: contact r102, relay
TB10, contactstbl02, b12, negative. The relay TB10 can be energized in the same way by all the subscribers of the sub-group T10 to T29 via the corresponding contacts r112, rl22 and r292.



   Relay TB10 is blocked by its contact tb103 using the following circuit: relay BL, contact tb103, relay TB10, contact r102, positive. The BL relay opens the bl2 contact by which the negative is disconnected from the Lan line so that after the operations of the relay
BL no subscriber from T10 to T89 can make a call and the mixing of calls is avoided. The .tbl02 contact is open. Contact tblOl at. connected 'the positive to prepare the ST11 rod electromagnets,
ST12 of the first preselector. The bll contact of the relay
BL connects the positive to relay G1 by the following circuit:

  <Desc / Clms Page number 22>

 positive, bll contact, G1 relay, mlll contact, negative.



  This circuit is established when the upper multiple of the pre-selectors IVWa to IVWd is free and therefore the electromagnet i, ill (fig. 5) is energized. The gil contact is attracted and connects the tigec electromagnets ST11, ST21, ST31 and ST41 to the multiples of connected rods STvll, STv21, STv31 and STv41. Of these rod multiples and electromagnets, the rod multiples STvll and STv41 as well as the rod electromagnets ST11 and ST41 are the only ones shown in detail. However, only the ST11 electromagnet can attract because only this electromagnet receives the positive via tblO1. By the attraction of the rod solenoid ST11 the intersection points of the multiple rods STv11 of the selector IVWa are prepared.

   The rod electromagnet ST11 attracts its contact stlll from which it follows that the following circuit is established for the bridge electromagnet BM1 of the multiple of br10 bridges: positive, contacts stlll, r101, bm103, BM10 bridge electromagnet, negative. The Z10 meter connected in parallel with the BM10 bridge electromagnet receives current but however insufficiently to be able to attract.

   The BM10 bridge electromagnet establishes the connection to the coupling point of the multiple of rods STvll and of the multiple of bridges BrlO, this point being indicated by a small circle in the planes so as to connect the subscriber line. T10 is established with the lines of the multiple of stems STvll. then the BM10 bridge electromagnet actuates its contacts bmlOl to bml03. Via contacts bmlO1 and bml02, the call potential is disconnected from the line of subscriber T10. Then the incoming line L1 is disconnected from the final selector of the connection circuit so that the subscriber station T10 is also kept opposite.

  <Desc / Clms Page number 23>

 incoming communications.

   Via contact bm103, the bridge electromagnet BM10 is blocked via the conductor brcl. The blocking circuit is as follows: negative, bridge electromagnet BM10, contact bml03, coupling point R3, stvc line to the electromagnet Mil (fig. 5) and from there through contact anll2, the line Lc20, contact bm911, relay BR91 to positive. Relay R10 (fig. 3) releases by opening contacts bmlOl and bml02, from which it follows that the excitation of relay BL is interrupted by opening contact rl02. Contacts bll and bl2 return to their normal position so that the Lan arming line is ready for further calls. The rod solenoid ST11 and the relay Gl are released.

   Through contact mlll the following free rod electromagnet, for example the rod solenoid ST12, is ready to receive a call pulse produced by the operation of relay M11. The Mil relay has been energized by the circuit previously described for the BM10 bridge electromagnet.



  By opening contact rl02, relay TB10 is also released. After the release of relay BL, the release channel is available for any of the 80 subscribers of the group represented. Relay AN11 connected to the stvd conductor is not energized by the switching of the IVWa preselector since the positive potential is not connected to the d conductor of the multiple of BrIO bridges.



  The AN11 relay is the switching relay for incoming communications.



   'In the second outgoing preselector IIVWab (fig. 3) the relay BR91 is energized by the conductor Lc20. In this way contact br912 is closed and the following circuit is established: negative, bridge electromagnet BM91, contact brS12, c113, rod electromagnet ST222,

  <Desc / Clms Page number 24>

 positive. By this circuit the ST222 rod electromagnet attracts but the BM91 electromagnet is only partially excited so that it only actuates its contact bmS12. The ST222 rod electromagnet prepares the coupling points for the STv222 rod multiple.

   By closing the bm912 contact, the following circuit of the BM91 bridge electromagnet is established: BM91 electromagnet, bm912, bm911 contacts, (this contact is only actuated when the BM91 electromagnet is fully energized ), relay BR91, positive. The BM91 electromagnet completely attracts and closes the points of intersection of the multiples of Br91 bridges with the multiples of STv222 rods of the second IIVWab preselector.



  The electromagnet BM91 is kept energized by means of the opposite potential connected through the intermediary of the relay C113 when by opening the contact bm911 the relay BR91 is disconnected, and after its release by opening the contact br912 the positive potential is disconnected from the ST222 rod solenoid. The rod solenoid ST222 is de-energized and through the contacts C113 the rod solenoid ST221 is connected to be prepared so that the multiple of rods STv221 is ready for the next communication.

   In the Spll3 feeder bridge which is connected, the A113 feeder bridge relay attracts (upper left corner of fig. 7) through the subscriber loop since after closing the coupling points k41 to k44 of the IIVWab preselector a continuous metallic connection is established with it.



   The power supply bridge Spl13 to which the calling subscriber is then connected has, as shown in the plans according to FIGS. 1 and 2, a connection with the

  <Desc / Clms Page number 25>

 incoming conversation reader LW and the searcher AS through which the calling line is connected with the receiving organs of the disc pulses of this connection circuit. The connection circuit selectors are 1 indicated by EIGW, EIIGW, ELW. The AS finder, the ABW input mechanism and the first group selector
EIGW of the connection circuit are shown in fig. 7 and 8. The second group selector and the final selector of the connection circuit are shown in fig. 13.

   The ELW final selector of the connection circuit transmits pulses to the desired station as we have seen. in fig. 1 and 2 from which it follows that the conversation circuit is established by means of the selector with coordinated movements on the other side of the power supply bridge Spl13 of FIG. 5. The incoming preselector IIVWan is represented (fig. 5) as giving access to the final selector LW (fig.8) by the first group selector IGW (fig. '9 and 10) and by the second group selector IIGW ( fig. 11 right side of the plan).



   As has already been indicated in the description of the device shown in FIGS. 3 to 6, relay A113 (fig. 7) attracts, when the power supply bridge Splll is seized by the station of the calling subscriber. Via contact all32 the following circuit is established for two-step relay VII3 (winding 1): positive, contact a1132, winding I of relay V113, negative.



   Relay V113 is energized until its first stage.



   In this way the contact v11321 is closed from where it follows. that the broom.asa of the AS finder is marked. In addition by entering the power supply bridge Spll3 the relay
C113 is excited by the negative potential connected to the Lcll conductor. Relay C113 closes a circuit for

  <Desc / Clms Page number 26>

 start a free finder via its contact cll, 53. This circuit is established as follows: positive, switch device Un1, contacts c1133, vll3411, pas2, DAS rotation electromagnet of the AS seeker, negative. The researcher starts to turn and moves his brushes asa, asc, ash, asz, ase step by step.

   Contacts ex, vx in parallel with contacts cll33 and v113411 belong to other power supply bridges which are served by the same researchers.



   When the AS seeker reaches the SpllS power supply bridge marked via contact c1132 of relay C113, the following circuit is established: negative, winding II of relay V113, contacts cll32, dell3l, asc brush of finder AS, relay PAS, positive. The PAS relay attracts and by closing the pasl contact keeps the supply bridge which has been found. The pas2 contact disconnects the DAS rotation electromagnet from the finder so that this finder stops. The pas3 contact connects the asa brush. The relay V113 attracts by its second winding until its second stage from where it follows that the contact v113411 is open and that the switch Un1 is disconnected.

   The pas3 contact connects the pulse sending tone to the calling line through the following circuit: negative, AZ tone generator, relay A2, contacts pgw21, pas3, searcher brush asa, capacitor CO1, conductor a of the control circuit conversation.



   When the subscriber begins to operate his disc after having received the tone for sending the pulses then by the first digit 7 emitted by the calling station, the relay A113 is actuated seven times. In this way, relay A2 is energized seven times by the

  <Desc / Clms Page number 27>

 following circuit: positive, contacts all32, v11321, brush asa, contacts not 3, pgw21, relay A2, upper winding of tone generator AZ, negative. The contact a21 closes seven times in a row from where it follows that the ascending electromagnet H2 of the first group selector EIGW of the connection circuit receives seven pulses. The slow relay U2 in series with the ascending electromagnet H2 attracts from the first pulse and remains energized during the train of seven pulses.



  Relay U2 opens contact u21 from the first impulse so that the rotation electromagnet D2 of the first group selector EIGW of the connection circuit is not attracted after the head contact ko22 has closed during the first train of pulses. When the first pulse train is finished, the group selector remains with its brushes agw1, cgw1, dgw1 on the seventh bank. Relay U2 is released since contact a21 has remained open for a certain time. When contact u21 is closed, the following circuit is established: positive, contacts pgw23, ko2, u21, a22, the rotation electromagnet D2 through the group selector to negative. The rotation electromagnet D2 is energized and the contact d21 is closed.



  In this way, relay A2 is energized and contact a22 is closed. The rotation electromagnet D2 releases from where it follows that the relay A2 also releases.



  From the first step. group selector rotation head contact w2 is open. The interaction between the rotation solenoid D2 and the relay A2 continues until the EIGW selector has found a free line leading to the second group selector. If the line whose conductors are indicated by Lal4, Lc14 and Ldl4 is free, the circuit follows

  <Desc / Clms Page number 28>

   is established: contact pas4, test relay (PGW2) of the group selector EIGW, brush cgw1, relay C4, negative. Relay C4 is shown again in fig. 13. The PGW2 relay attracts and by opening its pgw23 contact stops the group selector. The pgw22 contact is closed and in the known manner keeps the line which has been found.

   The pgw21 contact is actuated from where it follows that the line giving the impulses and controlled by the contact all32 is extended by the agwl brush from the first group selector to the impulse receiver relay A4 (fig. 13). of the second EIIGW group selector.



   The second digit 6 sent by the calling station causes the six times repeated release of the pulse receiver relay A113 of the power supply bridge Spll3 (fig. 4). In this way, via contact a1132, the pulse receiving relay A4 of the group selector (fig. 7) is energized six times. When relay A5 is first energized, slow relay U4 and the as-
H4 cension / of the second group selector EIIGW are energized by the closing of contact a41 (fig. 13). Subsequent pulses attract the lift solenoid H4 alone by contact a41 while relay U4 remains energized during the pulse train due to its slow relay characteristics.

   Relay U4 opens contact U42 such that the rotation electromagnet D4 of the second group selector cannot be influenced after the head contact ko41 has closed, which is closed from the first ascent step of the group selector. . When the second group selector has received the six pulses, relay U4 releases.



  The rotation electromagnet D4 is energized by the circuit

  <Desc / Clms Page number 29>

 next: positive, contact spgw43, ko4l, u42, a42, rotation electromagnet D4, negative. The rotation electromagnet D4 actuates its contact d4 from where it follows that the positive potential is connected to relay A4. Relay A4 attracts and opens its contact a42. The rotation electromagnet D4 releases. This interaction between.



  The rotation electromagnet D4 and the -relay A4 is continued until the brush cgwII has found a free line of the first step of rotation of the second group selector the contact of the rotation head w41 is open so that The ascent electromagnet H4 is not influenced by the oscillations of contact a41. When the second group selector finds a free line, for example a line leading to the final selector ELW, the following circuit is established: positive, contact c41, test relay PGW4, brush cgwII, relay C5, negative. The PGW4 test relay attracts and extends the lines to the agwII and dgwII brushes through the pgw41 and pgw44 contacts.



  The excitation circuit of the rotation electromagnet D4 is interrupted by contact pgw43. Contact pgw42 keeps the line which has been found in the well-known manner.



   The next number 2 emitted by the calling station attracts the A5 relay which is accessible by the agwII brush and which attracts twice. Relay A5 activates its contact a51 from where it follows that the ascent electromagnet H5 of the final selector ELW is activated. By this circuit the slow relay U5 is also energized. When the contact a51 has closed twice the brushes clw and dlw of the selector of the connection circuit come up to the level of the second bank. By the first impulse which arrives at the ascent electromagnet H5 the contact ko51 is

  <Desc / Clms Page number 30>

 open and the ko52 contact is closed.

   Since, however, from the first pulse the relay U5 is energized, the second pulse is conveyed by the closed contact ko52 and the closed contact u52 and the ascent electromagnet H5.



  The contact ko53 which was actuated by the first step of ascent of the final selector has no influence on the rotation electromagnet D5 since the contacts c51 and u53 are open. When the first train of pulses going to the final selector is complete, relay U5 releases since contact a51 remains open for a sufficiently long period. In this way the contact u51 is closed so that when the first pulse arrives from the second pulse train which reaches the final selector, the rotation electromagnet D5 and the relay E5 are energized by the following circuit: contacts a51, ko52, u51, relay E5, rotation electromagnet D5, negative. Relay E5 attracts its contacts e51, e52, e53 and e54. By contact e51, test relay P5 of the final selector is disconnected.

   Contact e52 establishes an excitation circuit for relay A5 which is independent of the operation of rotation head contact w52 which occurs during the first step of rotation of the final selector. Contact e53 disconnects the busy signal. Contact e54 establishes an excitation circuit for relay F5. While the other pulses are being sent by the calling station, the rotation electromagnet D5 is actuated intermittently by the contact a51 while the slow relay E5 remains energized. By contact f51 the final selector test circuit is prepared.



  If contact a51 is kept open by the calling station after sending the ninth pulse, relay E5 releases

  <Desc / Clms Page number 31>

 slowly. In this way, before releasing relay F5, the following circuit is established for the subscriber's set T29: positive, contacts c52, e51, f51, winding I of relay P5, brush clw of final selector ELW, line L2 (fig. 3), .- contact bm291, relay R29, negative. If relay P5 (fig. 13) attracts before releasing the relay.F5 the establishment of the guard circuit of winding II of relay P5 will result in the closing of contact p53.

   Contact p52 is closed and connects the dlw brush via the final selector to line L66 (fig. 3) which is connected to conductor d of the multiple of bridges Br29 of the IVWa preselector to which the called subscriber T29 is connected. . Contact p51 (fig. 13) opens the circuit passing through conductor a which can be connected to the occupied signal.



   If subscriber line 7629 is busy, the BM29 bridge solenoid (fig. 3) is energized. It follows that the contact bm291 is then open. In this case, there is no negative potential connected to line L2 so that after setting the final selector (ELW) (fig. 7), relay P5 cannot attract. When after a certain time relay F5 releases the test circuit prepared by contact f51 is then open. The calling subscriber receives the busy signal which is transmitted by the contacts e53, p51, the capacitor 607, the contact of the rotation head w52, towards the brushes agwII and by the contacts pgw21, pas3, the brush asa , the CO1 capacitor, the driver has (Lall) to the calling station.



  The release of the connection circuit occurs by the calling subscriber when he hangs up and will be described below,
If, however, the subscriber called T29 is free he must-]

  <Desc / Clms Page number 32>

 be connected through a second outgoing preselector through the IVWa preselector. In the test circuit already described for the ELW final selector (fig. 13), relay R29 (fig. 3) is energized. Assuming that the subscriber T10 has grasped the multiple of rods STvll, the rod electromagnets ST12 and ST22, ST32 and ST42 are prepared by the operation of the contact mlll. The switching of the multiple of bridges Br29 of the subscriber T29 is exactly as described for the multiple of bridges Br10 of the subscriber T10.

   By operating relay R29, the following circuit is established for relay TB10 by closing contact r292: negative, contacts bl2, tb102, relay TB10, contact r292, positive. The rems TB10 attracts and connects the positive through its contact tb101 to the prepared ST12 rod solenoid. Contact tbl02 is open and by conatct tb103 the blocking circuit is established for relay T210 and an excitation circuit is also established for relay BL.



  Contact bl2 has the effect of energizing relay G2 by the following circuit: positive, contact bll, relay G2, contacts m211, mlll (actuated), negative. Contact g21 is closed from which it follows that a negative actuates the electromagnet of the rods ST12 by contact mlll.



  The contact stl21 of the solenoid ST12 is closed from which it follows that a positive is connected by the contacts r101, r-111, r121, r131, r291, bm293, towards the electro-magnetb of Bi bridges,; 29. The electromagnet of bridges BM29 attracts and opens its contacts bm291 and bm292. By contact bm293 a guard circuit is established which passes through a coupling point k15 and the line stvcl of the devices of fig. 5 and 6 which follow and which are described below. Relay R29 is released and therefore

  <Desc / Clms Page number 33>

 so the BL and TB10 relays are released. The ST12 rod electromagnet is also released.



   When energizing the electromagnet; of bridges BM29 the conductor d indicated by brd2 of the bridge Br29 with which the brush dlw of the final selector ELW is connected via line L66 ,. is connected with the conductor d of the multiple of rods STvl2 via the coupling point kl6 so that at the moment of switching .by the bridge Br29 the following circuit is established for the winding I of the relay AN21 (fig. 5) via the stvdl line:

   negative, relay AN21, (winding 1), contact an211, line stvdl (fig. 4) of multiple STv42, coupling point kl6, line brd2 of multiple of bridges Br29, line L66, brush dlw of final selector ELW (fig. 7) contact p52 of the final selector ELW (fig. 13), brush dgwII of the second group selector EIIGW, contact pgw44, line Ldl4, brush dgw1 (fig. 7) ,. contact p31, relay U3, contact hw32 of the gripping mechanism ABW, rotation electromagnet D3 of the gripping mechanism, positive. Relay AN21 (fig. 3) activates its contacts an211, an212 and an213. Through contact an213, relay AN21 establishes a blocking circuit for its winding II to which a positive potential is connected by the second incoming preselector IIVWan through contact an212.



  By this potential the bridge electromagnet BM29 (fig. 3) is also excited after the operation of the contact bm293.



  The stvdl conductor of multiple STv42 (fig. 4) is connected by the contact an211 (fig. 5) to the LdlO conductor which leads to the second incoming preselector IIVWan. Entering the multiple bridges of the second IIVWab preselector does not take place since the energization of relay AN21 was already carried out before the closing of contact bm293 (fig. 3). The /]

  <Desc / Clms Page number 34>

 relay M21 (fig. 5) attracts from where it follows that by actuating contact m211 (fig. 3) the following multiple of rods of the preselector IVWa is ready for use.

   The activation of relay M21 (fig. 5), of relay BR93 and to maintain it by energizing winding II of relay AN21 and of the bridge electromagnet BM29 (fig. 3) are carried out by the following circuit: positive, relay BR93 (fig. 5), contact bm ± 31, line LclO of the multiple bridges Br93, contact an212, relay M21 (winding!) stvcl line (fig. 4), coupling point k15, line brc2 of the multiple of bridges Br29, contact bm293, electromagnet of bridges BM29, negative.



  Pulling relay BR93 (fig. 5) closes its contacts br931. The entered bridge multiple Br93 must then be coupled with a free rod multiple of a second IIVWan preselector.



   In the second incoming preselector IIVWan the which multiple of rods STv24 / is controlled by the solenoid of rods ST24 is entered. This multiple of rods results in an undescribed group preselector which is indicated by IGW11 in fig. 3. In this group selector, relay C11 is energized from where it follows that contact clll is also actuated. Therefore if the contact br931 indicated above is closed when entering the preselector IIVWan the following circuit is established: negative, bridges electromagnet BM93, contact br931, contact clll, (actuated), contact clOl, electromagnet of rods ST23, positive. The ST23 rod electromagnet attracts.

   The BM93 bridge electromagnet during its first operation only closes a bm932 contact and the coupling points k37 - k40, from which it follows that the BM93 bridge solenoid is fully energized by the circuit. next: negative, BM93, contact bm932, point of intersection of the second pre-

  <Desc / Clms Page number 35>

 IIVWank selector, line Lcl3, dsl2 contact, relay 010, positive to the first group selector IGW (fig. 9 and 10). Relay C10 attracts. Contact bm931 (fig. 5) is open, hence it follows that relay BR93 is disconnected. The positive potential given to relay BR93 is replaced by the positive potential given to relay 010 (fig. 9) so that the bridge electromagnet BM93 (fig. 5) does not release.



   By releasing relay BR93 (fig. 5) the contact br931 is opened so that the figs solenoid ST23 is released and the coupling rod returns to its normal position. The contacts actuated at the point of intersection of this rod with the bridge Br93, however, remain actuated. Contact clOl (fig. 6) is actuated by energizing relay C10 (fig. 9) from which it follows that the next rod electromagnet of selector IIVWan (fig. 5) is prepared.



     The group selector of which three multiples of bridges are shown is shown in fig. 9 and 10 by IGW. The multiples of bridges Br31 and Br32 are multiples of numbered bridges which give access to the second group selectors. Br33 indicates a multiple of bridges which corresponds to the multiple of bridges e500 of the general diagram given in figs. 1 and 2. This multiple of bridges is connected to an auxiliary unit selector as can be seen in fig. 2. Of the ten rod multiples of the IGW group selector only two are shown, these are the multiple of rods STv25 controlled by the rod solenoid ST25 and the multiple of rods STv26 controlled by the solenoid ST26.

   According to fig. 2 the first group selector of fig. 9 and 10 has eight mul- tiples of decks which are numbered in pairs.

  <Desc / Clms Page number 36>

 



   The marking selector associated with the IGW group selector is indicated in fig 2 by IBZ. It is a rotary stepper type selector having six brushes. these brushes are indicated by bza to bzf. The selector rotation electromagnet is indicated by DBZ.



   When the relay C10 is energized during the switching by the preselector IIVWan the following circuit is established by the contact c102: negative, relay ABT of the marking selector IB2, coupling relay KOP10 of the multiple of rods STv25, contacts cl02, um4, contact 0 of the contact bank of the bzd brush of the IBZ marking selector, positive. When the IBZ marking selector is coupled with another multiple of rods when relay 010 is operating, the conditions achieved by closing contact c102 are maintained until the marking selector returns to its normal position.



  When the marking selector has returned to its normal position, the circuits previously described for relays ABT and KOP10 become effective and the two relays engage, contact koplO4 being closed and by contact cl02 a blocking circuit being established for relays KOP100 and ABT. If during the operation of coupling a multiple of rods, another multiple of rods is seized by the operation of relay C12, the coupling relay KOP11 is connected by contact cll2. This relay cannot however attract since the excitation circuit is opened by the normal contact of the armature pallet cl02.

   The koplOl contact closes the marking selector circuit to receive the first digit 1 (first digit of the supply bridge number). This circuit is established as follows: negative, switch Un.5, DBZ rotation electromagnet of the marking selector

  <Desc / Clms Page number 37>

 uml contact, UBZ relay, bze brush, koplOl contact, line Ldl3 (also fig. 5), intersection point k36 of selector IIVVian (fig. 5), line LdlO, contact anSll, d conductor indicated stvdl, multiple of rods STv42 (fig. 4), coupling point k16du multiple of bridges Br29, line L66, brush dlw of line selector ELW (this brush corresponds to brush dlw in fig. 13), contact p52 ( fig.

   13), brush dgw11, contact pgw44, line Ldl4, brush dgw1 of the EIGW selector (fig. 7), contact p31, relay U3 of the input mechanism ABW, contact hw32, rotation electromagnet D3 of the input mechanism, positive. The first pulse of the switch Un5 of fig. 9 operates
The DBZ rotation electromagnet of the marking selector
IBZ of the group selector 'IGW (fig. 9 and 10) and the rotation magnet D3 of the ABW gripping mechanism in fig. 4. Also by this circuit the relay.UBZ (fig; 9) and the relay U3 of the ABW gripping mechanism (fig. 7) are energized. UBZ and U3 relays are slow relays.



   Since the first digit 1 of the power supply bridge
Sp113 '(with marking code 113) must be transmitted, relay P3 attracts, after the first impulse has reached the input mechanism ABW, by the following circuit: negative, relay P3, contact hw31, brush abwa in position 1, distribution connections to the ZV conversion device, ash brush of the AS searcher (in position 3), contact 1 of the ssa brush of the control connector
SS, positive. Contact p31 opens the circuit indicated above to the ABW input mechanism so that the rotation electromagnet D3 of the ABW input mechanism and the rotation electromagnet DBZ 'of the IBZ marking selector ( fig. 9 and 10), / can receive other pulses.

   After a very short time the relays U3 (fig. 7) and UBZ (fig. 9) release.

  <Desc / Clms Page number 38>

 



   In the input mechanism ABW (fig. 7) when the relay U3 was energized by the closing of the contact u32, the operating solenoid SS of the control connector SS was energized. Further advancement of the ssa control brush takes place, but only when the SS electromagnet is energized. When consequently the relay U3 releases after having sent an impulse by the line which transports the impulses then, by the opening of the contact u32 the electromagnet SS has been de-energized so that the brush asa of the researcher AS which marks the tens digit of the connecting bridge is connected to a certain potential. Then the contact u31 closes a circuit to return the input mechanism to its zero position.

   This circuit starts from the negative through the switch Un2 of the slow relay HW3, the arc 1-10 of the brush abwb of the gripping mechanism towards the rotation electromagnet D3 and from there to the positive. The HW3 relay remains energized until the gripping mechanism has returned to its normal position. Via contact hw31, the circuit of relay P3 is opened and this one releases. Contact p31 is closed but the pulse circuit is not reestablished since contact hu32 was opened when the ABW input mechanism was released.



   In the IBZ marking selector (fig. 9 and 10) the UBZ relay releases by opening the pulse circuit.



   The UBZ relay energized the slow relay Q by its first winding I during its first attraction by the following circuit: positive, contacts abt2, ubz3, winding of relay Q, negative. (The ABT relay was energized in series with the KOP10 coupling solenoid). The

  <Desc / Clms Page number 39>

 contact q2 prepares the excitation circuit for a bridge electromagnet via the bza brush.



  After releasing the UBZ relay, the ubzl contact closes the following test circuit: positive, PST test relay, subzl contacts, q2, guard winding II of relay Q, bza brush of the marking selector in position 1, bm312 contact, electro- BM31 bridge magnet, negative. By this circuit alone the PST test relay attracts. The pstl contact closes the following excitation circuit for the ST25 rod solenoid and for the NH relay: positive, NH relay, pstl contacts, kopl02, ST25 solenoid, negative. After the excitation of the solenoid ST25 and the NH relay, the nhl contact has the effect of increasing the current through the PST relay in the excitation circuit of the bridge solenoid BM31 in the sense that the nhl contact reduces the resistance of this circuit.

   The BM31 bridge electromagnet is then energized and opens the bm312 contact and by this same contact is blocked by line Lcl5 towards an input relay (015) of a second group selector IIGVV (fig. 11) made accessible via the multiple of bridges Br31.



   When the bridge electromagnet BM31 (fig. 9) is energized, the excitation of the switching relay DS1 follows, by the closing of the coupling point k66 on the multiple of rods STv25, this relay being placed on the conductor c (Law line) of the multiple of connections between the second preselector and the first group selector. The relay DS1 also receives the positive potential through the output conductor Lcl5 which is connected to the second group selector IIGW (fig. 11). The dsll contact of relay DS1 (fig. 5) opens the excitation circuit of relay C10 which releases. The dsl2 contact is closed and connects the incoming conductor

  <Desc / Clms Page number 40>

 c indicated by Lc13 to the outgoing conductor c indicated by Lc15.

   Contact cl02 of relay c10 returns to its normal position from which it follows that the coupling relay KOP10 and the relay ABT of the marking selector IBZ are released. The koplOl contact disconnects the IBZ marking selector from the Lc13 pulse conductor. Contact abt2 closes the return to standby circuit for the marking selector: negative, switch Un5, electromagnet DBZ, contact uml, relay UBZ, contact abtl, arc 1 - 10 of bzd brush, positive. When releasing the marking selector, the ubzl contact is open so that no other bridge electromagnet can be excited by the advancement of the bza brush. Closing the ubz2 contact has no effect since no coupling relay is energized.

   Another coupling relay can only attract again when the bzd broom has returned to its normal position.



   When the BM31 bridge electromagnet, which must be connected via the bza brush, is energized by the position of the IBZ marking selector, i.e. the multiple of bridges Br31 is already entered, the circuit PST relay excitation, which passes through the second winding of relay Q and the bza brush, cannot be established since the bm312 contact is open. It follows that after some time the relay Q releases and through the contact ql extends the test circuit to the brush bzb.



  As long as the relay \ ./ remains energized, the winding I of the relay R remains energized by the concact q3. This relay R connected the bzb brush of the marking selector via its contact 2r and prepared its winding II. When therefore the relay Q releases because the bridge electromagnet BM31 is energized, the following circuit is established by contact 2r which is still closed:

   positive

  <Desc / Clms Page number 41>

 pst relay, ubzl, ql, 2r contacts, winding II of relay R, bzb brush in position I, bm321 contact, BM32 bridge electromagnet. When the BM32 bridge electromagnet attracts after the excitation of the NH relay and the ST25 rod solenoid it directs the multiple of Br32 bridges to a second group selector and in this case in the same way as that described above for the multiple of bridges Br31. If, however, the multiple of bridges Br32 has already been entered also the connection is established / a third preselector (IIIVW) and an auxiliary group selector (IHGW) as described below.



   The second group selector IIGW (fig. II) accessible by the multiple of bridges Br31 (fig. 9) is connected in exactly the same way as the group selector IGW of fig. 9 and 10. The second group selector is therefore shown in FIG. 11 in its essential parts. Relay C15 of this group selector already mentioned on different occasions has the same situation and acts like relay C10 of the first group selector IGW in fig. 9. Via this relay the BM31 bridge solenoid of the first group selector receives the positive.

   The only difference in the operation of the second group selector IIGW (fig. 11) is the position of the SS control connector in fig. 7 which is in position 2. The contact grasped by the asz brush of the searcher is connected via the discriminator device ZV (fig. 7 lower left corner) to position 1 of the contact bank of the abwa brush of the ABW input mechanism for the transmission of the second digit 1 which is the characteristic digit of the Spll3 power supply bridge.

  <Desc / Clms Page number 42>

 



    After the transmission of the second digit 1 to the group selector IIGw shown in fig 11, the SS control connector in fig. 7 is brought to its position 3.



  The contact grasped by the ase brush of the AS seeker is connected by the intermediate discriminator device ZV to position 5 of the contact bank of the brush abwa of the ABW grasping mechanism so that the third digit characteristic of the power supply bridge Spll3, the digit 3, is transmitted to the final selector.



  In the IIGW group selector (fig. 11) which has already been mentioned and which is similar in construction to the first IGW group selector (fig. 5), the switching members which are the same are indicated by the same references as those used for the IGW selector (fig. 9 and 10) except that in the case of the IIGw group selector they have the index II. When, after setting the IIGW group selector in position by means of the IIBZ marking selector (not shown), the BM31II bridge electro-heater is activated, the communication is routed thanks to the multiple of STv26II rods and the multiple of Br31 bridges connected with him to the final selector LW in fig. 8.

   The final selector LW shown in fig. 8 is entered by contact bm312II and via line Lcl7 of the multiple of bridges BrSIII of the second group selector IIGW following the connection of the negative potential. This circuit passes in fig. 8 by the conductor Lcl7 of the multiple of bridges Br4, the contact ds41, the relay C4 towards the positive potential. The positive potential given to the relay C4 is the blocking potential for all the electromagnets of the preceding bridges and for the switching relays of the incoming conversation circuit. Assuming that the IIIBZ marking selector of the final selector is

  <Desc / Clms Page number 43>

 free relay 04 closes the following excitation circuit: positive, bzc brush of the IIIBZ marking selector, contact c41 (actuated), relay KOP4, relay ABT3, negative.



  The 'kop43 contact closes a blocking circuit for the KOP4 relay which is independent of the operation of the bzc brush, The kop41 contact closes the following pulse circuit: negative, switch device Un, rotation electromagnet DBZ of the selector marking IIIBZ of the selector final LW, slow relay U8 (activated as soon as the circuit is established), bzb brush in its rest position, contact kop41, conductor Ldl7 of the multiple of bridges Br4 of the final selector LW, line Ldl7 of the multiple of bridges Br31II of fig. 1, coupling point k52 of the multiple of rods STv26II, line Ldl5 (fig. 5), coupling point k67 of the first IGW group selector (fig.

   7), line Ldl3, coupling point of the multiple of rods STv23 of the second preselector IIVWan, line LdlO of the multiple of bridges Br93, contact an221, line stvdl, coupling point k16 of the multiple of bridges Br29 (fig. 3) of the substation subscriber T29, line L66, dlw brush. of the final selector of the ELW connection circuit (line L66 and brush dlw are represented again in 'fig. 13), contact p52 (fig. 13'), brush dgwII, contact pgw44, line Ldl4, (fig. 7 ), brush dgwl, contact p31, relay U3 of the gripping mechanism ABW, contact hw32, rotation electromagnet D3 of the gripping mechanism, positive.

   The transmission of the last characteristic digit 3 of the power supply bridge Spll3 takes place in the same way as the transmission of the previous pulse trains, in the sense that when the switch device Un (fig. 8) comes into play in the selector of marking IIIBZ the negative potential is connected to the previously indicated pulse circuit from which it follows that the electromagnet

  <Desc / Clms Page number 44>

 of rotation DBZ of relay U8 in the marking selector IIIBZ and relay U3 as well as the rotation solenoid D3 of the ABW gripping mechanism (fig. 7) are actuated.



  The IIIBZ marking selector advances one step from which it follows that the brushes bza, bzb and bzc advance. The circuit described above to the input mechanism ABW is maintained in position 1 of the marking selector IIIBZ by means of the contact u82 of the slow relay U8.



   In the input mechanism ABW the opening of the contact u51 causes the energization of the relay U3 from which it follows that the switch Un2 is disconnected from the brush bank abwb. Contact u32 causes the solenoid SS of the control connector to be energized, but the brush ssa advances only when the circuit of the solenoid SS is interrupted.



   The second impulse sent by the switch device One of the IIIBZ marking selector (fig. 8) acts in the same way as described and relating to the impulse creamer, the step-by-step movement of the brush of the IIIBZ selector and the mechanism. ABW input of fig. 7. Relay U8 and relay U3 remain energized in the marking selector and the input mechanism respectively.



   When the switch device A sends a third pulse, the brushes of the IIIBZ and ABW selector switch to position 3. In this position the test electromagnet P3 of the ABW input mechanism is energized by the following circuit: negative, test relay P3, contact hw31, abwa brush of the input mechanism in position 3, intermediate discriminator ZV, brush ase of the AS searcher, contact 3 of the contact bank of the ssa brush of the control connector, positive. Relay P3 attracts and opens

  <Desc / Clms Page number 45>

 the IIIBZ marking selector circuit via contact p31, this circuit passing through the EIGW selector (fig. 7), and LW (fig. 13), IVWa (fig. 4), IIVWan (fig. 5), IGW (fig. 13) .



  9 and 10), IIGW (fig. 11) and LW (fig. 8). Relay U3 (fig. 7) and relay U8 (fig. 8) release. The relay U3 of the gripping mechanism effects the connection of the rotation electromagnet D3 to the switch Un2 by closing the contact u31 so that the rotation electromagnet D3 is actuated intermittently and the ABW gripping mechanism brushes return to their normal position. During the release movement of the gripping mechanism the relay HW3 is energized., It is constructed as a slow relay or as an alternating current relay so that its contacts hw31 and hw32 are kept open during the intermittent energization of the electro - magnet D3. Relay P3 releases and opens its contacts.

   The SS control connector moves forward one step again when contact u32 opens.



   In the final selector, the IIIBZ marking selector has been brought to position 3 by three control pulses sent by the ABW input mechanism (fig. 7) so that the bza brush of the IIIBZ marking selector is on the contact of line 113. By this line the rod electromagnet ST113 is connected and controls the multiple of rods STvll3.



  When relay U8 releases after opening the pulse circuit, contact u81 is closed so that the following circuit is established: NH3 relay, contacts u81, abt32, bza brush, line 113, rod electromagnet ST113. The NH3 relay by its operation closes the NH31 contact from which it follows that the following excitation circuit is established for the multiple of bridges

  <Desc / Clms Page number 46>

 grasped Br4: positive, contacts nh31, kop42, bridge electromagnet BM4, negative. The bm41 contact closes the blocking circuit of the BM4 bridge electromagnet which first passes through the Lcl7 conductor to the positive at the C4 relay.

   Closing of the coupling point k47 of line c of the multiple of rods STvll3 has the effect of energizing the relay DS4 by the following circuit: negative, relay DS4, coupling point k47 of the multiple of rods STv113, relay DE113, contact vll33 of the supply bridge Sp113, positive. Relay DS4 activates its contact DS41. In this way the relay C4 is de-energized and the positive potential connected to the relay C4 is replaced by a positive potential connected to the conductor Lc25 through the contact vll33. This potential represents the blocking potential of all the preceding blocking electromagnets. Contact c41 opens the blocking circuit for coupling relay KOP4 and connection relay ABT3.

   Contact abt32 is open and the rod solenoid ST113 released. Then contact nh31 is open. The bridge electromagnet is kept energized by the bm41 contact. Contact abt31 closes the following circuit for the rotation electromagnet DBZ of marking selector IIIBZ by which the marking selector returns to its normal position: negative, switch device Un, electromagnet DBZ, contact abt31, brush bzc, positive. Through this circuit, the marking selector advances until it reaches its normal position. An impulse of the rod electromagnet during the release of the marking selector is not possible since the abt32 contact keeps the bza brush disconnected.

   During the release of the marking selector one of the two relays KOP4 or KOP5 cannot be energized either since

  <Desc / Clms Page number 47>

 the positive potential is connected to the bzc brush for the zero position only by the Lan conductor. As the contact u82 is kept open, the transmission of an error pulse on the line Lst when the marking selector is released is prevented.



   The establishment of the communication for the conversation between the two subscribers T10 and T29 is then established. Through the power supply bridge Spl13 on the side connected to the subscriber T29 (call number 7629) only the circuit details necessary for understanding the invention are shown. This feed bridge itself is combined in the known manner. By WQ a source of inrush current is indicated and comes into play when the talk circuit is established. Y113 is the supply relay of the station of the connected subscriber T29. The connection of the inrush current source WQ takes place when communication is established by means of contacts rul and ru2.



   The release of the connection circuit is caused by the closing of the marking points k45 to k48 of the final selector LW in the sense that the relay DE11S attracts when switching the marking point k47 (positive at contact vll35 and negative at relay DS4) .



  The DE113 relay opens the 1131 contact when it is energized from where it follows that the blocking circuit of the PAS relay of the AS finder is interrupted. The PAS relay releases and opens the EIGW group selector switch test circuit of the connection circuit through the pas4 contact. Relay PGW2 releases and via contact pgw23 'closes the following group selector release circuit: positive, contact pgw23, head contact ko22, contacts u21, a22,

  <Desc / Clms Page number 48>

 EIGW group selector D2 rotation solenoid, negative. The rotation electromagnet D2 attracts and closes its contact d21 by which the relay A2 is energized.

   Relay A2 opens its contact a22 which has the effect of releasing the rotation electromagnet D2. The interaction of these two organs is repeated until, at the end of the bench, the head contact ko22 is open, the group selector EIGW returning to its normal position from this position of rotation in the known manner. .



   In the EIIGW group selector (fig. 13) relay C4 releases. Contact c41 opens the circuit of the test relay pgw4 of the second group selector which releases. The pgw45 contact closes a circuit for the rotation solenoid D4. The rotation electromagnet D4 attracts and closes its contact d4. In this way, relay A4 is energized and by contact a42 the rotation electromagnet D4 is released. The rotation electromagnet releases and opens the circuit for relay A4 via contact d4. By contact a42 the rotation electromagnet D4 is then energized. The interaction continues until the brushes of the group selector have swept the contact bank.

   The head contact ko41 is open from where it follows that the group selector returns to its rest position in the normal way. By opening contact c41, relay C5 of the ELW final selector is also de-energized. In this way, by contact c52, test relay P5 and winding II of the final selector are disconnected. The following circuit is then established for the rotation electromagnet D5: negative, rotation electromagnet D5, contacts c51, u33, head contact ko53

  <Desc / Clms Page number 49>

 switch Un50, positive. Through this circuit the rotation electromagnet D5 receives pulses until the head contact ko53 opens. Contact ko53 is open as soon as the selector brushes have swept the contact bank, the final selector then returning to its normal position.



   The counting of a call which has been established is executed by the action of a Y113 feed bridge as soon as the called subscriber hangs up. The conditions of conductor c on the calling side are as follows: fig. 3 the bridge electromagnet BM10 and the counter Z10 are connected in parallel with the negative potential by the contact bmlO3 towards the conductor brcl of the multiple of bridges BrlO of the subscriber T10 of the preselector IVWa.



  The conductor c of the multiple of bridges Br10 is connected by the coupling point k3 with the conductor c indicated by stvc of the multiple of stems STvll. From this conductor, the connection goes through relay M11 (fig. 5) to conductor Lc20 of the multiple of bridges Br91 of the second preselector IIVWab and from there through the coupling point k43 to relay 0113 of the power supply bridge Spll3 (fig. 7) via the Lcll conductor. Fig. 7 represents relay 0115 with the components necessary for counting, namely resistance Wi, contact cll34 and contact in parallel v113II. Then the bridge electromagnet BM91 (lower right corner of fig. 6) is maintained by the same circuit (conductor c of the incoming communication) which is connected through the contact bml2.

   When counting, a not shown counting relay of the Spll3 power supply bridge (fig. 7) momentarily connects an earth to the conductor c (Lcll) on the calling side through contact 2113 by connecting contact z113 to the positive.

  <Desc / Clms Page number 50>

 



    In this way the current in the conductor c is increased from where it follows that the counter Z10 of the calling party (fig. 3) is activated.



   As already indicated, the conductor d on the input side of the conversation circuit serves to transmit the pulse trains to activate the conversation selector. Conductor d is connected via the KOP coupling relay in the individual selection stages to the marking selector and is disconnected from it as soon as the operation of the corresponding conversation selector is terminated.

   After releasing the connection circuit, the conductor d is extended from the incoming side from the start of the operation of the first preselector IVWa (fig. 4) until the disconnection is made by the supply bridge 113 (fig. 7). without being blocked. towards
When, for example, line / subscriber T29 is a trunk line, then between this line and its preselector a repeater relay is connected. Conductor d can then be used to transmit pulses to power relay A113 or a recording device, which can be connected to it can be used for selection via line T29.

   As a variant the conductor d can be used after the remote selection to transmit several counting pulses from the transmitter relay to the relay line of T29 for the purpose of counting between the supply / bridge A113 and the counter Z10 of the line. appellant. An organ which receives several count pulses is shown in fig. 7 in the Spll3 power supply bridge by the reference MZ. conversation
Subsequently the establishment of the circuit / by a

  <Desc / Clms Page number 51>

   432817 auxiliary group selector will be described.

   When operating the IGW group selector (fig. 9 and 10) the two multiples of bridges Br31 and Br32 connected to the: power supply bridge SpllS are indicated by 100 - 199 and are engaged, and the communication, will be routed by one of the multiples of bridges of the first group selector IGW which has no reference, for example by the multiple of bridges Br33 of the third preselector IIIVW.



   In fig. 1 five multiples of such bridges are shown in conjunction with the selector
IGW.



   From the: description of the operation of the first IGW group selector (fig. 9 and 10) it will be recalled that after the operation of the IBZ selector thanks to the relays Q and R of the IBZ marking selector (fig. 9 and
10) a test is performed to obtain one of the multiples of bridges numbered Br31 or Br32. If, however, these two multiples of bridges are occupied, the indication is given by contacts bm312 and bm321 which remain open.

   The relay R (winding II) of the marking selector IBZ then releases, from where it follows that the contact rl closes the following excitation circuit to send pulses to a multiple of free bridges of the third preselector IIVW; positive, PST relay of the marking selector, contacts ubzl, ql, rl, un5II, relay UM1, bzc brush of the marking selector IBZ in position 1, contact bm332
 EMI51.1
 of the bridge solenoid BM33, bridge solenoid BM33, negative. This circuit is established when the multiple of bridges Br33 is free. If the multiple of bridges Br33 is occupied, this circuit however passes through the actuated contact bm333 to the bridge electromagnet of the following free bridge. In the pulse circuits described above, the PST and UM relays

  <Desc / Clms Page number 52>

 (winding I) attract.

   The BM33 bridges electromagnet does not receive enough current however to attract. The UM relay is blocked by its following winding II: negative, UM relay, winding II), contacts um3, abt2, positive. The uml contact prepares the circuit for the first auxiliary group selector which is reached by the bridging multiple Br33.



  The pstl contact closes the following excitation circuit for the ST25 rod solenoid: negative, ST25 solenoid, kopl02 contacts, pstl, NH relay, positive.



  The ST25 rod solenoid prepares the ac-
Br33 coupling of the multiple of bridges / with the multiple of rods STv25. By closing the nhl contact the current in the pulse circuit of the BM33 bridge electromagnet is increased so that it attracts at this time. Contact bm331 closes a blocking circuit for the bridge solenoid BM33 and for a relay C6 (fig. 12) which is placed in the auxiliary group selector IHGW on the conductor (Lc16) of the multiple of rods STv6. The UM relay (fig. 9) is a two-stroke relay.

   It attracts only during the maximum excitation of the circuit of the electromagnet of bridges BM33 and therefore opens the contact um511 and therefore a pulse of the next free bridge multiple of the third preselector cannot be produced by the contact bm333 after the operation of the relay chain.



   An auxiliary group selector is shown in fig. 12 and it is assumed that the multiple of bridges Br33 of the third preselector IIIVW (fig. 10), the operation of which has been described above, has entered the upper right multiple STv6 of the auxiliary group selector IHGW of fig. 12 when the relay C6 is energized by / 7 through the conductor Lcl6. We then assume

  <Desc / Clms Page number 53>

 that the BZ6 marking selector associated with the IHGW auxiliary unit selector is free.

   In this case, contact c61 of relay C6 closes the following circuit: negative, switch Un6 of marking selector BZ6, bzd brush of marking selector in its zero position, line L54, contacts c71, c61, relay KOP6, ABT6 , positive. The relays KOP6 and ABT6 attract as soon as the switch Un6, has connected the negative to the brush bzd.



  The IHGW auxiliary group selector must then receive the digit 1 from the first IGW group selector (fig. 9 and 10) since the selection of the digit 1 by the input mechanism ABW (fig. 7) has no effect on the selector. IGW groups (Figs. 9 and 10).



   The conditions in which the conductor c of the previously established connection circuit are found are at this moment the following: in the first group selector (fig. 9 and 10) the multiple of rods STv25 has been entered and the relay C10 has been energized . The part of conductor c of multiple STv25 which extends to the third preselector IIIVW is kept to prevent direct current through capacitor K101. Despite the closing of the coupling point of the conductor c of the bridge Br33, the switching relay DS1 (fig. 9) cannot attract.



   Then when entering the first selector of the second incoming preselector, IGW groups by / the coupling relay KOP10 was energized from where it follows that the contact koplOS which is connected to the contact bank of the bzf brush of the selector IBZ marking (fig. 9 and 10) prepared the circuit.

   When the UM relay then attracts when the IBZ marking selector switches to the corresponding position of the third preselector IIIVW, the uml contact closes the following circuit: negative, switch Un5, DBZ rotation electromagnet of the IBZ marking selector, uml contact

  <Desc / Clms Page number 54>

 bzf brush in position 1, contacts kop103, dal6, d controller of the multiple of rods STv25, coupling point k71, line Ldl6 (fig. 12), contact kop6l, zero contact of the contact bank of the bzc brush of the selector marking BZ6, bzc brush, U6 relay, DBZ6 rotation electromagnet, positive.

   The switch Un5 activates the rotation electromagnet DBZ of the marking selector IBZ as well as the rotation electromagnet DBZ6 of FIG. 12. then this switch activates relay U6 (fig. 12) which remains energized during the individual pulses of the pulse train. The marking selector of the first IGW group selector (fig. 9 and 10) advances, by ten pulses, from its 1 position to its zero position. The marking selector BZ6 of the auxiliary group selector advances by these ten pulses from positions 10,9, 8 to position 1. Consequently the number 1 of the marking selector IBZ is transmitted to the marking selector BZ6. In the marking selector of the first group selector (fig. 9 and 10) the brushes reach the zero position.



  For this position, the circuit mentioned above for the bzf brush is interrupted so that the two marking selectors are stopped in the positions they occupy. In the marking selector BZ6 (fig. 12) the slow relay U6 releases. During the energization of relay U6, contact u65 energized slow relay Q6 by its winding I and by contact abt62 which was closed. The ABT6 relay is kept energized as soon as the bzd brush of the BZ6 marking selector advances in series with the KOP6 coupling relay via the contacts c61 and kop61.

  <Desc / Clms Page number 55>

 



   When after the transmission of the pulse train the relay U6 of the marking selector BZ6 releases, the following excitation circuit is established for the test relay PST6: positive, relay PST6 (windings II and I, contacts u61, q6l , already actuated, for some time) winding II of relay Q6, bza brush of marking selector BZ6, line 100, contact bm61, bridge electromagnet BM6, negative. The BM6 bridge electromagnet is not yet attractive. The PST6 relay closes the excitation circuit for the NH6 relay and the ST6 rod solenoid via the pst61 contact as follows: positive, NH6 relay, pst61 contacts, kop62, rod solenoid
ST6, negative.

   The NH61 contact of the NH6 relay is actuated from which it follows that the current in the energizing circuit of the bridge electromagnet BM6 is increased so that it attracts. The bm61 contact is actuated and connects the blocking circuit of the BM6 bridge electromagnet to a positive at the multiple of rods of a second group selector which is gripped by the multiple of bridges
Br6.



   If after the operation of the marking selector BZ6 the multiple of bridges Br6 is found occupied then the relay Q6 releases after a certain time since a blocking circuit is not established for the winding II. Contact q61 attracts and actuates the pulse circuit of the bridge solenoid by the brush bzb so that the bridge solenoid BM7, if free, is attracted. By the operation of one of the bridge electromagnets the multiple of STv6 rods is then connected with the corresponding multiple of bridges by the coupling points indicated by a small circle.



   The DS6 relay is energized (by a positive at the input relay. 010 fig. 9). Contact ds6l then causes the release

  <Desc / Clms Page number 56>

 of relay C6 and this de-energizes relays KOP6 and AE '5. The ABT6 relay returns the BZ6 marking selector to its normal position in the manner known as has been described for the ABT relay (fig. 9) concerning the IBZ marking selector.

   The switching of conductors c and d of the IGW group selector (fig. 9 and 10) takes place as follows: when the bridge solenoid BM6 of the auxiliary group selector IHGW attracts, the contact bm61 opens the circuit PST6 relay excitation, this relay releases and opens via the pst6l contact the excitation circuit for the NH6 relay and the ST6 rod electromagnet. The NH6 relay releases slowly because of its release delay.

   The alternating current then flows through the following circuit to the relay DS1 (fig. 9): alternating current source We through the contact pst62 (fig. 12), contacts nh62, kop64, conductor Lc16 (fig. 5), conductor c of the multiple of bridges Br33 of the third preselector IIIVW (fig. 10), coupling point k70, capacitor K101, relay DS1, negative. The relay DS1 attracts from where it follows that the contact ds13 short-circuits the capacitor K101.

   The DS1 relay is maintained by a positive connected to the input relay CG of the auxiliary group selector and later connected to the input relay of a second group selector (namely the group selector IIGW15, fig. 12) which for example is connected in the same way to relay C10 of the first IGW group selector (fig. 9 and 10). Then the dsll contact (fig. 9) opens the circuit of the C10 relay. Contact ds12 connects conductor c. The d conductor is extended by the dsl5 contact. When relay C10 is released, contact c102 is opened so that the IBZ marking selector of the first IGW group selector is

  <Desc / Clms Page number 57>

 ready to be entered again in the manner already described.



   In the following, a special method of actuating the um4 contact of the IBZ marking selector in fig. 9 will be described. When, for example, during the establishment of any communication, relay C12 attracts via a second incoming preselector (not shown) and the coupling relay KOP11 and the ABT relay are attracted by contact cl22, then if it is assumed that the communication is to be routed by one of the multiples of bridges of the third preselector IIIVW, the following operation is carried out: as already described when establishing a communication by the auxiliary group selector, the first group selector marking selector returns to standby even though the ABT relay is still energized.

   During this operation of the marking selector, a new connection can be established for example by relay C10 so that by contact c'102 relay KOP10 is energized as soon as the positive is connected by brush bzd.



  In order to prevent the premature connection of the marking selector still busy working with the IHGW auxiliary group selector when it finds a new input relay C10, the UM relay which has been energized by the um4 contact opens the excitation circuit for the coupling relay. As soon as the switching described above takes place, relay C12 releases and opens contact cl22 of the blocking circuit of relay ABT. In this way the blocking circuit via the winding II of the relay UM is also opened by the contact abt2 so that the contact um4 closes the energizing circuit of the coupling relay.

   It should be noted that in fig. 2 the five bridges of the third preselector

  <Desc / Clms Page number 58>

 of the IG group selector, i (40) lead to various IHG group selectors. second group selectors such that through the multiple of bridges of the third pre-selector there is always a clear path to the second group selector in the desired direction of traffic.



   When establishing a communication, the multiple of bridges 110 - 119 of the second group selector (fig. 2) is occupied, the communication goes through a multiple of free bridges of the fourth preselector
IVV. to a second auxiliary group selector, namely the auxiliary group selector IIHGW. This communication is established in exactly the same manner as a communication established by the first group selector IHG so that the description of the switching operations is superfluous.



   Since the second preselector, as already described has twenty five access devices, and these access devices are only available to the ten outgoing lines, it is necessary to keep the other fifteen remaining access devices when the ten outgoing lines are entered. In fig. 6 two input relays (C112, C113) for the outgoing lines of the second IIVSab preselector are shown. Together there are ten groups of seizure relays for power bridges from SpllO to Spll9. When all pickup relays C110 to C119 are energized an excitation circuit is closed for an RSP blocking relay which is shown to the right of fig. 6. This has twenty five contacts, ie one for each multiple of the preselector bridges.

   As shown in Figs. 5 and, 6 the two multiples of rods from the first preselector extend to the same second outgoing preselector IIVWab.

  <Desc / Clms Page number 59>

 



  The upper rod multiple of the first preselector IVWa and the bridge multiple Br91 of the second preselector IIVWab have been entered for the previously described communication. If it is assumed that nine other communications exist at this time, the other access units to the second preselector, namely the access units via the multiple of bridges Br90, are kept upstream.



   The RSP blocking relay of the second preselector is energized. Two of its twenty-five contacts are shown in fig. 5, these are the rspl and rsp2 contacts.



  These contacts actuate the second windings of the chain relays Mll and M21. Relay M11 has already been energized by the described communication but relay M21 has not yet been energized. When contact rsp2 then energizes winding II of relay M21, contact m211 (fig-. 3) connects the chain for the excitation of the rod electromagnets of the first preselector although the lower multiple of rods STvl2 - STv42 shown. - sent 'is not requested for the moment. In this way after the ten multiples of bridges of the second IIVWab preselector have been used the other fifteen bridges multiples of the preselector are kept.



   The release of the conversation circuit results from hanging up the receiver of the calling station.



  In fig. 7 relay A113 is energized during the conversation. The positive connected to relay C113 is the guard potential for the electromagnets on the calling side and the positive connected to contact vll33 is the positive potential for all guard electromagnets on the called side. When the called subscriber hangs up, relay Y113 releases but this no longer has any effect on the establishment of the communication.

  <Desc / Clms Page number 60>

 



  Only when the receiver of the calling station is hung up, winding I of relay V113 returns to its normal situation when relay A113 is released. From this, tocon by opening the contact v113II the conductor c indicated by Lcll is disconnected on the calling side of the supply bridge Sp113. The guard electromagnets which are connected to the conductor c are released. Contact c1134 remains open for a very short time so as to ensure the release of these electromagnets.



  By opening the contact vll33 the conductor c on the outgoing side is opened from which it follows that all the guard electromagnets also release. When these electromagnets are released all the components return to their initial position.



   Another attempt to reach subscriber T29 will occur when the line is busy. It has been stated that the caller will receive the busy signal when the final ELW selector (fig. 13) of the connection circuit does not find a gripping potential through the clw brush. When the calling subscriber then hangs up, the connection circuit and the connection of this line to the supply bridge are released. We have already seen that when released, relay 0113 (fig. 7) releases and in this way the conversation circuit is released. Contact cll32 shown in fig. 7 then opens so that the blocking circuit of the PAS relay is open.

   The V113 and PAS relays release so that the connecting circuit is released.



   In fig. 2 the rod multiples of the first four preselectors IVWa, IVWb, IVWc and IVWd connected together to a rack are shown as multiple plates. Better use of outgoing lines

  <Desc / Clms Page number 61>

 is obtained by staggering them and the rows of the arrangements, multiples in the free selection stage can be increased while keeping the same number of points at the selector when the multiples are selected automatically for each communication and for positions ranging from ' from the first to the last and when the lines selected subsequently are multiplied, input selectors other than the first start to search for the lines.



   The input string which is indicated by the contacts mlll and m211 in fig. 3 which is controlled by relays M11 and M21 (fig. 5) is privileged with regard to the connections of multiple rods Stvl, Stvl2 etc of the series such that the rod multiples of the first four group selectors connected to a frame are arranged to form a complete panel.



   In fig. 14 and 15 a phasing of multiples is shown for the first preselection stage. The digits 1, 2, 3, 4 to 14 represent multiples of four-conductor rods for the first preset stage, the multiple 1 connections representing the multiple connections of a first preselector mounted with twenty multiples of bridges, and the multiples of connections 2 and 3 - 8 being mounted in the same way. The multiple connections 9, 10, 11 and 12 extend as multiple plates on the two preselectors connected together while the multiple connections 13 and 14 represent the rod multiples of four first preselectors connected together each having twenty. multiples of bridges.

  <Desc / Clms Page number 62>

 



   The multiple of rods 1 is the first line selected in the bridge multiples of subscribers 10 to 29, the multiple 8 plays the same role for the subscribers 30 to 49, the multiple 3 for the subscribers 50 to 69 and the multiple * for the subscribers. subscribers 70 to 89. The multiple 9 is the multiple line selected in the third position which is however also accessible to subscribers 10 to 49. The multiples of rods 13 and 14 extend over all the multiples of bridges of subscribers 10 to 89, The 80 subscribers which are indicated in fig. 3 and 4 are according to the .Ce ;. 14 and 15 connected to fourteen staggered outgoing lines which are at. their disposition.



  Since the remainder of the construction of the coordinated motion selector represents ten multiples of rods, it is easily seen that the four multiples of rods not shown in the gis. 14 and 1 @ can be divided in the same way. However, using the gradation according to fig. 14 and 15 with eight multiples of rods for each selector a sufficient number of outgoing lines (14) can be reached.



     Each multiple of rods 1 to 14 of Figs. 14 and 13 has a relay ni (M1 to M14 not shown) each of them having a winding connected in the conductor c and an auxiliary winding to ensure the protection of the upstream components. These relays are connected in the same way as the relays M11 and 1.121 shown in fig. 5. For the twenty multiples of Aes subscribers 10 to 29 the string connections consisting of relay contacts m11, m51, m91, mlll, m131 and ml41 are used.



  The multiples of bridges of subscribers 30 to 49 have only two access devices which are specific to them and which are controlled by the contacts m21 and m61. In the same way

  <Desc / Clms Page number 63>

 there are only two access devices for the multiples of subscribers' bridges 70 to 89 and these access devices are provided with contacts m41 and m81. For the multiples of bridges of subscribers 50 to 69, the access units m31, m71, m101 and m121 are used.



   The chain connection which begins with the contacts m21 and m61 is then connected with the chain formed by the contacts m91 to ml41. The chain connection which begins with contacts m31 and m71 is also connected to contacts m41 and m81.



   In addition to controlling the chain connections formed by contacts m11 to m141, the appropriate rod electromagnets must be energized. In order to energize these the relay connections shown in the lower part of figs. 14 and 15 are used. ' The relays TB1, TB3, TB5 and TB7 shown here correspond to the relays shown in fig. 3 and 4 by TB10, TB30, TB50 and TB70.



  Relay BL1 corresponds to relay BL in fig. 3, but a blocking relay operating in this way is provided in the device of fig. 14 and 15 for each sub-group of subscribers which in this case for subscribers 10 to 29, the relay BL is provided, for subscribers 30 to 49 the relay BL3, for the subscribers of the sub-group 50 to 69 the relay BL5 and for subscribers of sub-group 70 to 89 the relay BL7. The contacts tbl, tb31, tb51 and tb71 act in the same way as the contacts tblO1 and tb701 of fig. 2. Relays BL1, BL3, BL5 and BL7 serve to prevent double connections in the same way as relay BL in fig. 3.

   Relay BL5, however, attracts for example by'contacts only through chain contacts m31, m7l, m101, m121 for while / the remaining rod multiples (fig. 13 and 14)

  <Desc / Clms Page number 64>

 which are used for the multiples of subscribers' bridges from 50 to 69, relay BL1 which controls contact bll2 is accessible.



   This dependency is further controlled by other m contacts in the chains. So for example relay TB5 of subscriber group 50 to 69 attracts at the same time as relay BL5 as long as one of the relays M3 to M12 (chain of contacts m31, m71, m101, ml21 and appropriate contact m32, to m123 and m33 to ml23) which are actuated at the same time by contacts m31 to m121 located in their normal position.



   In order to describe the effect of this chain we will consider a typical case:
When the subscriber 30 makes a call, the call relay R30, not shown, is actuated and produces the same effect as the relay R10 of FIG. 3. The subscriber relay R30 then closes the contacts shown in fig.



  14 by r @ 02. If it is assumed that the multiple of rods is immediately entered and that the corresponding relay @ 2 which is reached via the line of the multiple of rods, is energized, the contacts m21, m22 and m23 are actuated . When contact r302 is closed, the following circuit for energizing relay TB3 is established: positive, contact r302, relay TB3, contacts tb32, m22 (activated), m52 (in its normal position), b131, negative. Relay TB3 attracts and energizes relay BL3 via the following circuit: negative, relay BL3, contact m63, m23 (actuated), tb33, releis TB5, contact r302, positive.



  Relay TB3 by closing contact tb31 causes the rod solenoid ST6 to be energized after relay G6 has previously been energized by contact bl32, contact m61 (in its normal position) and the

  <Desc / Clms Page number 65>

 contact actuated m21. The relays TB @ and BL3 are released when the relay R30 associated with the calling line is released * .. in the same way as that described and concerning the effect of the RIO relay in fig. 3.



   If the subscriber 30 executes a call at a time when only multiples of rods 13 and 14 are free, relay BL1 will be energized. All contacts of chain relays M2 to M11 are actuated. When contact R302 is closed, the following circuit is established: positive, '' contact r302, relay TB3, contacts tb32, m22, m62 (both actuated), contact blll, negative. Contact tb33 closes the excitation circuit of relay BL1. This is established as follows: positive, contact r302, relay TB3, contacts tb33, m23, m63 (both actuated), relay BL1, negative. By closing contact bll2, the positive is connected to relay G13 which is connected by contact m131 (in its normal position) and by the actuated contacts mlll, m91, m51, m11 to negative.

   The relay G13 by closing its contact g13 causes the excitation of the multiple of rods Stl8. The excitation of the bridge electromagnet associated with the subscriber. 30 takes place in the same manner as that which has been described and with reference to the bridge electromagnet BM10 of FIG. 3.



   The gradation of the first preselector is characterized by the use of several chains operating as indicated in figs. 14 and 15.



   Figs. 16 and 17 show a connection circuit which is suitable for traffic to other offices.



   As already described after the operation of the final selector of the connection circuit (ELW, fig. 13) a pulse is transferred to the called station from which it follows that in a few seconds the conversation circuit is established through which then passes. current to the post

  <Desc / Clms Page number 66>

 request.

   If it is assumed that the trunk line which terminates at subscriber T29 leads to another office, it is advisable, after having sent the pulses on the neighboring line, to immediately send inrush current so that a line which would have received pulses in the neighboring system is not seized by an outgoing communication
The connection circuit shown in fig. 16 and 17 is for this purpose provided for sending inrush current when sending pulses on a requested trunk line.

   Further, until the closing of the final talk circuit occurs a communication for the talk is momentarily established by sending pulses from the final end of the talk circuit through the connecting circuit which is replaced. by the normal conversation circuit after the operation of the conversation selector. Do plus the ELW final selector in fig. 17 has the possibility of choosing among several junctions.



  * In the upper left corner of fig. 16 the feed bridge of fig. 7 already described in detail is shown again. The EIG @ and EIIGW group selectors of the connection circuit are different from the corresponding ones in fig. 7 and 13 due to the additional conversation conductor (conductor b).



  The final selector of the connection circuit is shown in more detail with the members for the free selection of multiple junction so that in the described arrangement the multiple junctions are connected to a particular group of one hundred lines (or group of thousand) of such so that the individual lines can be indicated according to the representation of fig. 13.

  <Desc / Clms Page number 67>

 



   If the calling subscriber has sent the first two digits to reach the requested line, the selectors EIGW and EIIGW are actuated in the same manner as that described and with reference to the corresponding selectors of fig. 7 and 13. When the second selector is the final selector, of groups EIIGW, fig. 16, enters / relay 07 of the final selector is engaged. By the selection made by the third digit which in the embodiment described is assumed to be 2, contact a1132 returns twice to its normal position following two consecutive releases of relay A113.

   In this way, relay A7 of the ELW final selector is energized by the following circuit: positive, contacts all32, vll321, ASA searcher brush AS, contact pas3, contact pgw21 of the test relay of the first group selector of the connection circuit, brush agwI. contact pgw41 of the test relay of the second group selector of the connection circuit, agwll brush, relay A7 (winding 1), negative. The relay A7 attracts its contact a71 so that its ascent electromagnet H7 of the final selector is actuated twice.



  By this circuit the slow relay V7 also attracts by the following circuit: positive, contact a71, relay V7, contacts u73, w71, electromagnet H7, negative. The final selector moves its brushes two steps forward and actuates the ko71 ascension head contact on its first step. After the train of pulses, relay V7 releases from where it follows that relay U7 is energized by the following circuit: negative, ascending electromagnet H7 (H7 does not attract by this circuit), rotation head contact w71, relay U7 (winding I) contacts c73, v74, lifting head contact closed ko71, positive.



  By pulling the relay U7 a circuit is prepared by the. contact u73 for the rotation solenoid

  <Desc / Clms Page number 68>

   D7 by which this circuit is activated thanks to the last train of pulses emitted by the calling station. This circuit starts from the positive through the contact a71, the relay V7, the contacts u73, p75, the rotation electromagnet D7 towards the negative. From the first rotation step of the final selector, the w71 rotation head contact is open. However, relay U7 remains energized by its winding II by the following circuit: negative, winding II of relay U7, contacts u76, v75, positive. Relay V7 is kept energized by the operating circuit of the rotating electromagnet during the pulse train.

   The number 9 is assumed to be the last number emitted by the calling posbe.



   The ELW final selector, after having made the selection by number 9, brings its brushes into position on the first connection of the local system marked by number 7629. This line is already occupied. It follows that the test circuit passing through the brush clw of the final selector and through the line Lcl8 to the relay R29 is opened by the contact bm291. The progression of the final selector from the busy line to another position is effected by the multiple contact mk. Such contacts are represented by se (ie in the book by LUbberger entitled "Automatic telephony installations volume 5, fig. 163).

   The last tooth of the multiple contact mk is removed so that the last connection of the multiples is tested as an individual connection.



   Since the test circuit of relay P7 is not closed for the first connection, the electromagnet D7 attracts again via the following circuit: negative, rotating electromagnet D7, contacts p75, u75 (meanwhile the relay V7 released), multiple contact mk, contracts

  <Desc / Clms Page number 69>

 v74, ko71, positive. The rotation electromagnet D7 attracts and the contact d71 controlled by this electromagnet closes. In this way, relay U7 is energized by its winding II in the following circuit: negative, winding II of relay U7, contacts d71, v74, ko71, positive. Contact u75 opens the circuit of electromagnet D7, from which the rotation electromagnet is released, contact d71 causing relay U7 (winding II) to release.

   The interaction continues until relay P7 attracts by finding a free line. The following circuit is then established: positive, contacts c71, v73, u78 (closed since the last rotation step), relay P7, brush clw, line Lcl8, relay R of the free junction line found. This relay R is connected in the same way as the relay R29 shown. The multiple of bridges belonging to a multiple connection can be established in any desired preselector so that heavy traffic to that junction can be divided according to office requirements.

   The multiple of bridges actuated by the pulses through the final selector ELW then establishes the connection to a second incoming preselector in the manner previously described from which it follows that by the connection of the conductor d (Ldl8, L66) the conductive selector is in position.



   The corresponding relay P7 opens the operating circuit of the electromagnet D7 through contact p75 and through contacts p71 and p72 connects the conversation circuit. This passes through the conductors La18, Lbl8 to go to the conductors Lal9 and Lbl9. The Lal8 and Lbl8 conductors are connected by the a and b conductors to the EIIGW and EIGW group selectors and the

  <Desc / Clms Page number 70>

 asa and asb brushes from the AS searcher to the Lall and Lbll lines leading to the calling station. These conductors are isolated from the SpllS power supply bridge to prevent the passage of direct current by means of capacitors KOM1 and KOM2.

   Since relay U7 of the final selector ELW remains energized after energizing relay P7 during its release period, relay U7 attracts again via the following circuit: positive, contact u72, winding II of relay V7, contact p75, electro -D7 magnet (which does not attract), negative. Contact v72 sends the first inrush pulse to line 7629. This circuit passes through the alternating current source Hu through contacts v72, p71, brush alw, conductor La18. the loop of the station line called Lbl8, blw brush, contact p72, shock coil Y7, positive.



  After releasing slow relay U7 (winding II) this current flow is terminated. The call will not continue in the normal way. In a similar case the normal conversation circuit through the conversation selector back to the power supply relay Y113 of the power supply bridge Spll3 can be closed immediately and the inrush current of the final selector of the connection circuit ELW activates the power supply relay Y113 and thus performs a dummy response.



   If the local attendant has not answered when the Y113 supply relay has been actuated, another call will take place as previously described from the Y113 supply relay. However, when it has already answered beforehand and it has conversed via the conversation circuit comprising the connection circuit, then, when the normal conversation circuit is connected, the supply relay Y113 attracts

  <Desc / Clms Page number 71>

 and immediately disconnects the inrush current.



   After the establishment of the normal conversation circuit, the connection circuit is released as described above.



   When the final selector ELW of the connection circuit (fig. 17) finds the last connection of multiple r (the tooth of mk is missing), the final selector no longer starts to turn and the calling station receives the busy signal. pation by the following circuit: contacts c74, p77, winding II of relay A7, head contact w72, occupancy signal BeS. This signal is transmitted by induction to the calling station through winding I of relay A7.



   When the connection circuit is released, the opening of the conductor c follows as already described with regard to the connection circuit of FIGS. 14 and 15.



  'Therefore relay C7 releases in final selector ELW and opens the circuit for energizing the windings of relay P7 through contacts c71 and c75.



  Contact c73 closes the following operating circuit for rotation solenoid D7: solenoid D7, contacts p75, u75, c73, v74, lifting head contact ko71, positive. Contact d71 of the rotation solenoid activates relay U7 by: negative, winding II of relay U7, contacts d71, v74, ko71, positive point. The solenoid D7 and the relay U7 remain / energized until the ascender head contact ko71 opens from which it follows that the final selector ELW returns to its normal position in the known manner .



   If line 7629 is used as a trunk line for automatic remote traffic, the selector
 EMI71.1
 end ELW of the connection circuit is used as intermediate selector. The calling subscriber can then //

  <Desc / Clms Page number 72>

 continue the selection by the connection circuit without pausing after the number (7629) of the trunk line, since the conversation circuit is established by conductor d which is not necessary for the digital selection of the subscriber.



   If the connection circuits are also used as junctions between individual connections and momentarily as the conversation circuits, and if they are combined to call the requested line free then the two subscribers if the called party answers immediately can communicate with each other via the calling circuits. connection until after a few seconds the conversation circuit is established.



   It should be noted that the conversation circuit (fig. 1 and 2) which is established from the called station to the supply bridge can also be established in the reverse direction from the outgoing side to the incoming side. In this case the multiples of rods of the second incoming preselector (fig.l) will have the references indicated for example in the case of the first multiple of rods st81 going to the first selector of groups IGW of fig. 1 which received the number 515. The first group selector is then to be connected to a power supply bridge and the outgoing connection of the second incoming preselector to the multiples of rods of the final selector.

   Then as with a second incoming preselector, an outgoing line, for example 315, entered, is connected to a pulse transmitter or an input mechanism which sends the corresponding pulse trains through the connection circuit to the marking selectors which follow these pulses coming from the feed bridge. The marking of the connected supply bridge, and carried out by the researcher in the embodiment shown, is then replaced by that given by a device determining the number of the outgoing line entered (315).


    

Claims (1)

CLAIMS. 1. A telephone system in which pulses transmitted by a calling station are used to establish a communication to a called station by a channel distinct from that of the conversation, the latter then being established by the operation of digital connectors using pulses transmitted by the called extension line. 2. A telephone system in which a calling line is automatically extended to a free supply bridge among several. Bridges: supply, this bridge then being connected through a connector with automatic selection to a connector with digital selection responding to pulses transmitted by the calling subscriber, the operation of the auto-selectable connector for controlling the automatic transmission of pulses from the called subscriber's line to the bridge; power supply chosen to establish a conversation circuit. 3. A telephone system in which pulses transmitted by a calling subscriber are used to establish a communication to a called subscriber by a channel distinct from that of conversation, the latter then being established by digital selection by means of connectors of the type having several lines. both incoming and outgoing, so that several communications can take place simultaneously through them. 4. A telephone system having conversation circuits established through connectors of the type. Having several lines both incoming and outgoing so that several communications can take place simultaneously through them, in <Desc / Clms Page number 74> in which a marking device associated with each connector is combined to be actuated and establish contact with a particular outgoing line following a pulse train and whether that line is busy routing the communication to an auxiliary connector by through a free outgoing line common to several different dialing lines. 5. A telephone system as claimed in claim 1, 2, 3 or 4 in which the connectors of the conversation circuit are controlled by means of marking devices which are actuated by a pulse transmitter which is automatically activated as soon as a call is received. takes place. 6. A telephone system as claimed in claim 5 in which an incoming line from a selector of the speech circuit is normally combined to provide access through a marking device to a single outgoing line corresponding to any one. particular number of incoming pulses. 7. A telephone system as claimed in claim 5 wherein each contact of the marking device is associated with two outgoing lines, the second of which is used when the first is busy. 8. A telephone system as claimed in claim 5, 6 or 7 in which a marking device is combined to be released after establishment of a. EMI74.1 col.u.m¯aicetion by 1 'inbcrnu.dia ire of the selector of the conversation circuit which is associated with it from where it follows that this marking device is available to establish EMI74.2 another coinrunication by the same selector. 9. A telephone system as claimed in claim 6 or 7 in which circuit selectors for <Desc / Clms Page number 75> conversation are provided with a number of outgoing non-networked lines leading to auxiliary group connectors for which communication can be routed when the lines accessible by digital selection are busy. 10. A telephone system as claimed in claim 4 or 9 wherein the digital selection in the auxiliary group selector is obtained by pulses transmitted when the tag connector associated with the corresponding talk selector has returned to its normal position. 11. A telephone system as claimed in claim 10 wherein the marking device when it returns to its normal position is not made available for further use until the communication is routed through the auxiliary selector. 12. A telephone system as claimed in claim 4, 9, 10 or 11 in which the auxiliary selectors are combined to provide access to connectors on the next floor. 13. A telephone system as claimed in any one of the preceding claims wherein the conversation circuit for both the calling party and the called party is routed through non-digital select connectors which are used for both inbound and outbound communications. for outgoing communications. 14. A telephone system as claimed in claim 13 in which communications are routed through additional non-digital select connectors, different connectors being used for incoming calls and for outgoing calls. <Desc / Clms Page number 76> 15. A telephone system as claimed in claim 15 wherein both incoming and outgoing communications are routed in the same direction through non-digital select connectors. 16. A telephone system as claimed in claim 14 in which one of the additional non-digital select connectors is used to establish a communication to a free supply bridge and the other to establish a communication to a group selector of the conversation circuit. 17. A telephone system as claimed in claim 14 or 16 in which when all outgoing lines from the additional and outgoing non-digital selector connector are engaged all other free incoming lines are held and cannot be seized. 18. A telephone system as claimed in any one of the preceding claims in which four-conductor lines are used, two of such conductors acting as talking conductors and the third being used for testing and holding purposes while the fourth is being used. used to discriminate outgoing calls from incoming calls by means of non-digital select connectors and also, to transmit pulses to selectors while marking a called line. 19. A telephone system as claimed in any one of the preceding claims in which the connectors which are pulse operated to mark and preferably to call the called subscriber are up and rotate type selectors. <Desc / Clms Page number 77> 20. A telephone system as claimed in any one of the preceding claims in which the connectors of the conversation circuit are of the coordinated movement type or of the crossbar type. 21. A telephone system as claimed in claim 20 in which for the final and non-digital selection stages of the speech circuit the multiples of the bridges of the co-ordinated motion selectors serve as incoming lines while in the group selection stages the multiples. of rods serve as incoming lines. 22. A telephone system as claimed in any one of the preceding claims in which the blocking potentials of all energized switching electromagnets of the conversation circuit are supplied by the feed bridge used for communication, from which the connection and conversation circuits are divided. 23. A telephone system as claimed in claim 5 in which the marking connector which actuates a final selector of the conversation circuit connects the requested outgoing line with the incoming line entered without test operations performed beforehand. 24. A telephone system as claimed. of claim 13 or 15 wherein the multiples of the non-digital select connectors are combined to be scaled. 25. A circuit arrangement as described herein and shown in the attached plans.