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Feb. l, 193%“ F._WOLF 2,106,881 TELEPHONE SYSTEM Filed Feb. 10,_ 1956 2 Sheets-Sheet l INVENTOR. N x,32 :3 |- . FRITZ WOLF BY.. . ATTORNEY. Feb. 1, 1938. F. WOLF 2,106,881 TELEPHONE SYSTEM Filed Feb. 10, 1956 2 Sheets-Sheet 2 (TSt.2 ATTORNEY. 2,106,881 Patented Feb. 1, 1938 UNITED STATES PATENT OFFICE ‘ 2,106,881 TELEPHONE SYSTEM Fritz Wolf, Birkenwerder, near Berlin, Germany, assignor to Siemens & Halske Aktiengesell sch-aft, Wernerwerk, Siemensstadt, near Berlin, Germany Application February 10‘, 1936, Serial No. 63,114 In Germany February 2-7, 1935 8 Claims. (Cl. 179-17) This invention relates to a circuit arrangement for remote communication systems and more es pecially for telephone systems in which a plu rality of lines extending in various traiiic direc 5 tions are in connection with a plurality of con necting paths by way of a common connecting line, leading to an exchange and a junction point in the latter. In the case of outgoing calls unde sired switching-over operations in the connecting 10 devices of the exchange, caused by the speaking path to the calling subscriber’s line not being completely established in due time, are prevented, and at the same time an ef?cient impulse trans mission is ensured, in that a potential which is 1 connected up under the in?uence of a call initiat ing impulse, and serves to in?uence controlling means in the connecting devices, is disconnected after the call has been initiated in the exchange but not before the speaking line has been switched 20 through to the calling line. The present invention is concerned with means for preventing disturbances in operation by in ?uencing the controlling means in connecting de vices of an incoming connecting path, while main~ 2 taining e?icient impulse transmission in the case of outgoing calls. This is accomplished accord ing to the invention in that an auxiliary potential is applied to the connecting path of a line which is to be used in a speaking connection and which 30 is connected to the exchange by way of a‘ connect ing line common to other subscribers’ lines, for the purpose of in?uencing controlling means (feeding bridges) in connecting devices in the ex change transitcrily in the case of outgoing calls 35 and in the case of incoming calls throughout the duration of the latter. By means of the arrangement according to the invention it is possible for this principle, which renders e?icient impulse transmission possible in 40 the case of outgoing calls and consists in con necting up an auxiliary potential only transitorily in the case of outgoing calls, also to be used in systems in which the called subscriber can take up and replace his receiver a number of times. 45 On account of the auxiliary potential being con nected throughout the duration of the incoming call, the in?uencing of the feeding bridge in the incoming connecting path, which occurs when the receiver is replaced again after having been taken ‘)0 up and causes undesirable switching operations, is effectively prevented. In the embodiment so-called two-party line systems are shown in which two subscribers’ sta tions Whose lines are brought together at a switch 5 ing point are connected to a switching-over point (UStZ) by way of a common connecting line. The invention is, however, not limited to two-party line systems. It is also possible for more than two subscribers’ lines to be associated at the switching-over point UStl, and also in place of subscribers’ stations, connecting lines, party lines or the like may be connected up. In the drawings, Fig. 1 shows an arrangement of the invention, while Fig. 2 shows a modi?ca tion thereof. In the embodiments two subscribers’ stations TStl and 'I‘StZ are shown whose lines are con nected to the switching-over point UStZ to the exchange devices in which an individual approach to preselecting devices (preselectors or call ?nd 15 ers) is provided for each subscriber’s station of the two-party line. Intercommunication between the two subscribers of the two-party line is not possible. The manner of operation of the arrangement according to Fig. 1 is as follows: If a subscriber, for example, the subscriber at station TStl wishes to set up a call he takes up his receiver and there by closes the circuit for relay RI in the switching over point UStZ: earth, battery, winding I of re 25 lay RI , contact ltl, contact 2152, a-lead of the con necting line, winding I of relay Ul, contact 3u2 line to subscriber’s station TStl, contact 411,2, winding 11 of relay Ui, contact 5ul, earth. Relay III which is situated in this circuit does not ener 30 gize. Relay R! is energized, however, at the switching-over point UStZ and by closing its con tact 6H connects earth to the a-lead over contact 1H, while over contact 81"! battery through choke coil Dr! is connected to the b-lead. The pre 35 selector W! is accordingly set in motion in known manner. When it finds a free group se lector GW relay T in the preselector is energized in the known manner and switches through the line to the group selector over contacts 9t and Hit. 40 Relay T! at the switching-over point UStZ is ac cordingly energized over the circuit: earth, bat tery in the group selector, a-lead, preselector VWl, contact 9t, winding I of relay Tl, contacts 61'! and ‘it! and earth. Relay '1'! looks up over 45 contact Hi! and resistance W2‘! and its winding II. Blocking potential is connected to the ?nal selector approach of the second subscriber over contact l5tl so that this is protected against in coming calls. Moreover, the opening of contact lZtl and the closing of contact it‘tl effects the switching-over of the junction at the switching over point USt2. By the closing of contact Hit! the battery potential connected to the a-lead in the group selector G-W operates directly on relay 55 2 2,106,881 III at the switching-over point UStI. Relay Ui is accordingly energized and opens its contact coil DrI on the energizing of relay RI, as in Fig. 1, and remains connected up until relay RI re MI and closes its contact I5uI so that the speak leases when the speaking path is ?nally switched through to the calling line. ing path is switched through at the switching over point UStI. Meanwhile, the slow operating relay RI has ?nally released at the switching-over point UStZ and by closing contact I6rI has switched through the b-lead of the speaking line to the group se 10 lector in a metallic circuit while shunting cone denser CI. Since contacts SH, SH, I‘IrI, and I8rl are now open there are now no switching means associated with the speaking path which are capa ble of distorting the impulses. 15 Corresponding operations are brought about when a call is initiated from the subscriber’s sta tion TStZ. While a call is in progress from one subscriber’s station the other subscriber’s station In the case of incoming calls relays RI and TI UK are energized over winding II, as in Fig. 1. Over contact 8rI relay RI connects auxiliary potential to the b-lead and thus prevents the transmission of the criterion for “toll knock down”. In place of a second winding of relay RI a special aux 10 iliary relay I-II can be provided which connects the auxiliary potential to the b-lead over its con tact hI and the choke coil DrI. The further switching operations correspond to those in Fig. 1. 15 In order to ensure the energizing of relay TI, winding II of this relay can in the case of out going calls be connected over resistance WiI is completely disconnected from the connecting and contact 2211 so that it is pre-magnetized line on account of the opening of contacts 3112 and M2 or ISuI and 20m. without being energized. In the case of incoming calls, for example to subscriber T‘StI, a circuit is established for re lays RI and TI after the ?nal selector has tested 25 on the appropriate contact: earth in the ?nal selector LW, c-lead, winding II of relay RI , con tact 2H2, winding II of relay TI, battery, and earth. Relays RI and TI energize in this circuit. By closing contact I4tI relay TI switches through 30 the a-lead of the speaking line while the switch ing-over of the junction is effected’ by the closing of contact I 3tl. In order to prevent undesired When the switching through to the group selector GW takes place only a small amount of energy is necessary to cause the relay TI to energize over its winding I. Also in the case of incoming calls the ener gizing of relay TI can be ensured in a special manner if a third low resistance winding is pro vided in the incoming c-lead in series with wind ing II, this facilitating the energizing of relay TI over its winding II. What is claimed is: 1. In a telephone system, a. common line, tele phone lines branched from one end of said com 30.’ switching operations from being brought about in mon line, connecting lines branched from the the preceding selecting device GW if, in contrast . other end of said common line, switches in each 35 to the conditions obtaining in the case of indi phone lines, means responsive to an incoming call on switching over points UStI and UStZ must ?rst mon line and one of said connecting lines into use be operated, an auxiliary potential is applied to the b-lead of the connecting. line over con tact 8rI: earth, battery, choke coil DrI, contact 8rI, b-lead to the ?nal selector. By this means, the criterion for “toll knock down” is prevented 45 from being produced in preceding selecting de vices GW. This auxiliary potentialremains op erative throughout the duration of the incoming call. For the purpose of balancing the sub scriber’s line a choke coil D12 is connected over 50 contact I'IrI, while over 22M and the choke coil D13 earth potential is applied to the b-lead of the connecting line leading to the switching~ 5.5 connecting line for extending calls from said tele- ‘ vidual subscribers’ outgoing calls, wherein the loop is not immediately closed when the sub scriber calls, because the switching over device over point UStI. When the called subscriber replies relay UI energizes over the earth applied by way of contact 51d and locks up after closing its contact I5uI over contact 2211 and the choke coil Dr3. ' On the release of the connection relays UI and RI deenergize on account of the release of the ?nal selector LW. Moreover, relay T in the preselector is connected in parallel with the relay TI (winding II) so that this also returns to its rest position and the switching-over devices are accordingly restored to normal. 65 The second embodiment is differentiated from the ?rst only in the construction of the switching over point USt2, the difference being in the ar rangement of the bridge for connecting the aux iliary potential which in this case consists only of the choke coils DrI, Dr! or Dr3, Drll. The b-lead of the speaking line is ‘permanently switched through at the switching-over point Ust2 in a metallic circuit; On initiating an out going call auxiliary potential is connected to the 57.5 b-lead of the line over contact Srl and the choke over either connecting line or an outgoing call on one of said telephone lines for taking said com‘ to the exclusion of the other telephone line and 40 connecting line, switching means in said connect ing line operated responsive to the call to apply an auxiliary potential to the connecting line to in?u ence the switches thereon, said switching means operated transitorily responsive to an outgoing call and for the duration of an incoming call. 2. In a telephone system, a common line, a. pair of telephone lines branched from one end of said common line, a pair of connecting lines corre sponding‘to said telephone lines branched from 50 the other end of said common line, switches in each of said connecting lines for extending calls, means responsive to an incoming call or an out going call for taking the common line and one of the connecting lines into use to the exclusion 55 of the other telephone line and connecting line, a relay in the connecting path taken into use, said relay operated momentarily in the case of an out going call and continuously in the case of an incoming call, and means controlled by the opera— tion of said relay for applying a particular poten tial to the connecting line in order to control the operation of the switches on the connecting line. so 3. In a telephone system as claimed in claim 2 in which the switching through of the connect 65 ing line the common line and the telephone line in a loop circuit to the associated switches is interrupted transitorily by the relay responsive to an outgoing call and responsive to an in coming call for the duration of the same. YO 4. In a telephone system as claimed in claim 2 in which the common line telephone line and connecting line ‘are switched through in a loop - circuit to the associated switches and in which the relay connects the auxiliary potential transi 2,106,881 torily to the line in the case of outgoing calls and. for the duration of an incoming call, and in which in the case of the incoming call the auxiliary potential and the breaking of the loop circuit to the switches takes place at the time when the connecting line corresponding to the wanted tele phone line is engaged. 5. In a telephone system, a common line, a pair of telephone lines branched from one end of said 10 common line, a pair of connecting lines branched from the other end of said common line, switches in each of said connecting lines for extending calls, means responsive to a call for taking one of said telephone lines the associated connecting 15 line and the common line into- use, said lines adapted to be switched through in a loop circuit to the associated switches, a relay in the con necting line operated transitorily responsive to an outgoing call and for the duration of an in 20 coming call, said relay connecting an auxiliary potential to the connecting line and interrupting the loop circuit extending to the switches in order to effect a control of the same, said relay oper ated in the case of an incoming call over the 25 testing circuit for the connecting line and in the case of an outgoing call over one side of the con necting and telephone lines. 3 6. In a telephone system as claimed in claim 5 in which the other telephone line and the other connecting line are disconnected from the com mon line when the ?rst telephone and connect ing lines are engaged in a call, and in which said other telephone and connecting line is guarded from seizure on an incoming call while said ?rst lines are in use. '7. In a telephone system as claimed in claim 5 in which a further auxiliary potential is applied 10 by the relay to one side of the connecting line responsive to an outgoing call in order to initiate the operation of the switches, and in which the said further auxiliary potential is disconnected by an auxiliary relay operated responsive to an 15 incoming call. 8. In a telephone system as claimed in claim 5 in which a further potential is applied by the relay to one side of the connecting line respon sive to an outgoing call in order to initiate the 20 operation of the switches, and in which the said further auxiliary potential is disconnected by an auxiliary relay operated responsive to an incom ing call, said auxiliary relay operated over the incoming testing circuit simultaneously with said 25 ?rst relay. FRITZ WOLF.