CH238065A - Telephone installation. - Google Patents

Description

  

  Telephone installation. The present invention relates to a telephone installation and, although it relates more particularly to the establishment of communications which must be recorded for purposes of charging, that is to say communications outside of those for which the charge can be determined by operating a counter specific to a calling subscriber one or more times, the invention has other applications as well.



  Usually, when a call is to be directed to an operator, the subscriber sends a special digit, the "0". It is also well known to use the same equipment such as a trunk line and its associated apparatus to direct a call to an attendant and to use this same equipment also for other operations involving the transmission of calls. 'a special digit, other than the digit which characterizes the call, to an operator, and it is an aim of the present invention to use equipment normally used to establish a communication to an operator, also for other operations, such as recording the peculiarities of certain calls for charging without using a first distinctive digit.



  The telephone installation according to the present invention is characterized by two control devices for means for selecting an operator position, the one of these control devices comprising a time determining member which is put into service. , in means responding to the transmission of a first digit, when the subscriber sends a predetermined digit and which, after a predetermined time, if no other digit has been transmitted, actuates the means for selecting a position operator to direct the call to an operator position, while the other control device comprises means responding to the transmission of a second digit which,

   in response to the transmission of a second predetermined digit following the first, also actuates the same means for selecting an operator position to direct the call to the operator position if the predetermined time mined has not elapsed between the emission of the two successive digits. If the second digit fre is not of the predetermined value, it can be used for other purposes, for example to direct the call to a registration position for inter-network communications. Preferably, the predetermined value of the second digit mentioned is the same as the value of the digit which is normally assigned to an operator.

    It will be understood that in such an installation only a single initial digit can be used for all special calls, instead of two or more as up to now, while, even if the subscriber neglects to repeat the digit when he calls an attendant, the result will be the same, in that the call is directed to an attendant after a short delay.



  Preferably, the means which respond to the transmission of the additional digit are located at a different and later stage of the connection, for example in a different office, than the means which are put into service by the transmission of the preliminary digit , and if said additional digit is of said predetermined value, a signal can be transmitted back through the connection to direct the call to the operator. If the figure is of a value other than the predetermined value, the call can be directed to means for recording the communication associated with the connection stage last reached.



  The means which are put into service by the transmission of the figure normally given to an operator may consist of a recorder translator, which may include devices responding to the transmission of another figure of a predetermined value or, by case of a delay in the transmission of other digits, causing the call to be sent to an operator. These means can still include devices which are actuated, if the number is of a value other than the predetermined value, to direct the call to a position for recording the communication for inter-communication. -networks.



  The accompanying drawings show, diagrammatically and by way of example, the connection circuits of one embodiment of the object of the present invention.



  Fig. 1 shows the arrangement of two networks without recorder-tradLictors which can be two networks taken from a certain number of identical networks in which, for inter-network calls, a simplified form of recorder-traductew- which will be called path discriminator in which distance and time charging will be carried out by means of automatic call recording devices.



  Fig. 2 shows how, in principle, the establishment of communications between offices A and B in fig. 1, the arrangement being such that the first digit sent is 8 in the case of inter-network communications which require automatic recording of calls.



  Fig. 3 shows a key variant the establishment of communications in the case of calls for which registration is required, the number sent starting with the digits 01 to. 09, access to a manual table in a main office being obtained by sending the digits "00".



  Fig. 4 shows the arrangement of a network with recorder-translators made up of a number of tandem or so-called central offices where the call recording devices which are necessary to polish certain types of established communications will be placed. within the sector, or to offices or networks outside the sector in question.



  The fi * 5 represents the junction diagram in the case of the routing of a call coming from an office (the zone with registrars-translators and ending at an office or a network, located outside the zone , via a sub-central office.



  Figs. 6 and 7 arranged side by side show the circuits of a simplified level 0 recorder-translator.



  In order to carry out the identification of the calling subscriber, call identification and conversation apparatus of the type described in patent No. 2 $ 7887 can be used; for the application of the invention, one can use the apparatuses and the circuits described in general in the patent No. 285877.



  We will now refer to FIG. 1 and taking into account that the intercommunications between the two networks represented and between any of these networks and other networks which are not represented, should have been, until now, established by the '' intermediary of the manual positions of the main offices B and C,

   the arrangements made so that such communications can be established and recorded automatically will be described below.



  For simplicity, it has been assumed that each network includes a main office, such as B or C, and a number of satellite offices such as A and D; firstly, the establishment of calls taken by subscribers from offices A and B will be taken care of, and reference is made for this description to the junction diagrams of FIG. 2.



  It should be understood that each network will have its own closed numbering system and that a two or three digit code will be added as a prefix to the number of the requested subscriber in the case of inter-network communications. In order to be able to discriminate between local numbers and inter-network call numbers, all calls in the latter category will have as a prefix a first common digit not used until that moment, for example 8, followed by one or more several prefix digits accompanying the call number in the requested network.

   The sending of the first digit 8 by subscribers who have an unrestricted service causes the call to be routed to the main office from where it is directed to a group of long distance relays which puts into service translator devices and call recorders, translator devices, also called channel discriminators, direct the call to the requested network either directly or through other networks.



  If we consider the case of a call made by a subscriber connected to satellite office A, we can see that two groups of junctions have been provided between this office and the main office B, these junctions being divided into ordinary junctions and junctions high yield.



  When the subscriber picks up his receiver, he is connected, via the LF line finder, to a DSR discriminator repeater selector which is associated with the latter; these switches are connected to a ZSR arrival selector of the main office, through Ü / S finder and ordinary junction 10, as is well known.



  8i the first digit transmitted is a digit between 1 and 7 or 9, which indicates that a subscriber of the closed numbering system is requested in satellite office A, in main office B or in any of the other offices in the network, the DSR repeater selector, after having been brought up to a certain level in parallel with the ISR arrival selector and in agreement with the number sent, will release the junction in the case of a local call or a call to a neighboring office and connect to a local secondary selector;

   or it will keep the junction in service and repeat the next digit to junction 10, the ISR input selector and terminals, such as 12, of the switches which will establish communication with the subscriber of the main office B or another office in the network directly connected to office B.



  In the event that the first digit sent is 0, the ordinary junction 10 is released and the call is routed, through the high efficiency junction 11, to <B> the </B> manual table from the main office, a suitable discrimination signal being sent from the starting relay group <I> ORS </I> from the satellite office to the relay group <I> DRS </I> discrimination from the main office to direct the communication to jack 0 of the manual table in the main office.

   In the event that the subscriber uses a prepaid set, a different signal is sent to the DITS relay group to direct the communication to a special CE jack on the manual table in the main office.



  If the calling subscriber wishes to establish an inter-network communication, the first digit sent will be 8; in this case, the ordinary junction 10 is released as before. and a high efficiency junction 11 is.

    commissioning at level 8 of the DSR. Him distinctive signal being transmitted from the starting relay group <I> ORS </I> to direct communication, to the DRS relay group, to the TLRS interurban relay group. Subscribers using prepayment sets and sending this figure, while they are not authorized to automatically obtain such communications, are prevented from completing such a maneuver, either by sending a suitable signal sent. of the relay group <I> ORS </I> and who,

   through the relay group <I> DRS </I> causes the transfer of communication to the special CB jacks of the manual table of the main office, either by the fact that there is no access possible to the ORS relay group from the level 8 of the special group of DSR switches intended for such posts.



  When the TLRS relay group is put into service, it gives access to an OCS start selector, the researcher HS connecting to. a channel discriminator <B> BD </B> free.

   Before considering the issue of recording the call, we will describe the routing of the communication to its. destination; in the case considered, one or more digits follow the first digit sent, they are received by the channel discriminator which performs the necessary translations and transmits the required discriminators, to the incoming switch of the desired network, through a group of trunk relays, the originating switch and subsequent switches.

   The trunk of long distance relays will be provided with a device for preserving and regenerating the pulses, for example, of the electromechanical type described in patent No. 191044; this device will be used to keep the rest of the digits emitted, during the transmission, of the translated digits coming from the route discriminator.



       Qitatid all discriminator digits have been returned, the TLRS relay group pulse conservation and regeneration apparatus returns the retained digits, in untranslated form, to complete the connection to the requested subscriber.



  With regard to the question of recording such calls, we know that the minimum number of training required to enable them to be charged at the caller's expense consists in the indication of the number. calling and the number called and, if calls are charged per duration, the time taken by the call and the time and date, if necessary.



  For the identification of the calling number, it should be noted that the establishment of an inter-network communicationLix results in the association of the group of outgoing relays. <I> ORS </I> from office A, through the dear RSF, <I> to </I> a group (the relay <I> SC </I> custody control, which in turn connects to a group of ID control relays,

      this is done during the establishment of the connection or when the called subscriber answers or during the conversation or at the. end of it, depending on what is jubf # preferable.

       When the relay group IC operates, it activates an identification switch SS which works in the manner described in patent No. <B> 237887, </B> which causes the identification of the calling subscriber which is retained in the outgoing ORS relay group, the retention being performed as described, for example, in this patent.

        With regard to the retention of the calling number at the office of origin, until it is necessary to transmit it to the office where the recording devices: of calls are provided, it can be seen that if this operation - is carried out by means of! Key retention relay and a rotary switch:

  sending, as described in the aforementioned patent, it will not be necessary to provide the SC relay group nor the RSF seeker, since the calling number can be transmitted directly to the relay group. <I> ORS. </I> However, one can make use of an electromechanical device for conservation-and regeneration in the OR relay group <I> S </I>,

   -and in this case it may be preferable to use a common control group SC and a researcher RSF, as shown in fig. 1, so that the signals characteristic of the identity of the calling subscriber can be received in the first place, either by relays or by a step-by-step switch, in the common relay group SC .

   These relays or this step-by-step switch convert the received signals into suitable markings for placing the regenerator of the ORS relay group "in such a way that the number can be retransmitted later in code form to the office. distant.



  Regarding the called number, the digits; sent to the interurban relay group TLRS are kept, for example, by relays and, at the end of the conservation, the HF researcher who, it should be noted, has his bench divided! in such a way that he can have access:

   successively to the channel discriminators and to the call recording devices, is connected to a PCRS recording or printing controller to which the number of the calling subscriber will be transmitted. by the departure relay group -from office A; junction 11 will be released, after which the number of the called subscriber will be transmitted to this apparatus as well as the duration of the call which will have been recorded by suitable apparatuses of the long distance relay group.

    The date and time will also be given by a common equipment, such as DTU, and the controller will direct the information he has received to the ticket printer or the perforator P.

   The total charge for the call may be established manually or by suitable calculating machines and it is proposed that if it is desirable to employ means determining the charge, these should be included in the monitoring equipment of the. printer or recorder, the fee being determined at the end of the conversation.



  The general arrangement of the printer or of the recording apparatus may, for convenience, be of the type described in Patent No. 235877 amended, so that it meets the conditions described above, the recorder or the The printer itself being such that it does not come into operation until the information is ready for immediate printing or recording.



       The channel discriminator described differs from normal register-converters, such as those used in areas with more than one office, in that it is only required to receive the first digits of the transmitted number and, out. action of these, to direct the call to the office or the required network while the recorder-translator is designed for,

         receive a full number and under the action of it to direct the call directly to the requested subscriber. If therefore the caller ID is designed to fully perform the functions of a recorder-translator, the device for preserving and regenerating the pulses of the long-distance relay group can be used to preserve the number called until that this information is required for long distance registration,

      and it will not be necessary to provide conservation relays, to fulfill this function, in the iuterurbfiin relay group.



  With regard to the calls made by subscribers of the main office, it can be seen that these have access to the first digital selector SR through a junction, such as 13, and that the establishment of communications which require registration are carried out as described above.

        Although believed in the arrangement described the calls to the manual table and the inter-network calls are routed through a group of trunks and that the calls to the subscribers of the closed numbering system are routed through the intermediary of another group of junctions, only one group of junctions may be provided to the main office to serve calls of all categories, = discriminating signals being used to effect the correct routing of the call to the main office.



  Discriminator selectors in satellite offices could be replaced by ordinary primary selectors which, when put into service, have access to common discrimination equipment, through a finder, this discrimination equipment being used to determine whether the call is to be counted or charged by means of an automatic recording device (the calls and consequently causing the routing of the communication in the main office. The discrimination equipment may be of the type. described in British Patents Nos. 473003 and 473015.



  As an extended application of this system, one can consider the case of a number of repeated unit charging districts each comprising several networks, working on the basis of a multiplied unit charge in the case of inter-network calls. , the set being able to be re-edited automatically on the basis of the recording of calls.

   In such a case, the recorded inter-network calls are directed through the central office of each zone, where the call recording devices are installed, and it may be that in certain special cases communications between offices. from neighboring areas, but are only distant from each other by a distance less than that for which the unit advance is foreseen, will be taxed on the basis of the recording of calls .

   Subscribers using prepaid sets will only be able to establish unit charge connections of this kind via a manual table.



  In the arrangement described above, separate first digits are necessary for an operator day and for interurban calls with recording, and in this case, known arrangements are followed in which separate first digits are necessary for an operator and for calls that require a number of subscriber counter operations.



  In the event that there is no first digit available # (# to be used for inter-network calls, arrangements can be made so that calls to the manual table in the main office are obtained in sending the digits "() 0", calls requiring recording requiring the sending of a group of two digits of <B> 01 </B> at 09.



  La, fi * 3 shows typical junction arrangements at satellite office A and main office B where level 0 is used to access long distance offices. It can be seen that the apparatuses of office A have been established according to the principles already described in relation to. fi:;. 2, a discriminator repeater selector being provided in this office and having access to a high efficiency junction 11, via a group of ORS start relays.



  If the first digit sent is "0", we will have access to a group of DRS discrimination relays of office 13 and, in the case of a call sent by an ordinary subscriber - if the latter neglects to emit other digits, within a specified period of time, the communication will be directed to the manual table in the main office. When the DRS relay group is put into service, it connects to a free TLRS trunk relay group, through a finder,

   and this group of relays receives the second digit transmitted. If this number is "0", which indicates that the manual table is being requested, a signal will be sent by the TLRS relay group to the DRS relay group to direct communication to. manual table, but yes. the second digit is one of the digits 1 to 9, the trunk relay group will direct this second digit to a channel discriminator in the manner which has been described in relation to fig. 2. The recording of the call is, therefore, carried out in the manner which has been described previously.



  In the case of calls from subscribers at the main office, if the figure "0" is sent as the first figure, we will have access, through the selector S, to a group of SDRS relays, conservation and discrimination , which works in the same way as the DRS relay group, except that it also has the possibility of retaining the identity of the calling subscriber until it is required for the registration of the call. 'call.



  Long distance calls from the manual table are established through the O / G jack which gives access to the long distance relay group, through a searcher and in the usual manner; but in this case, since the call must be recorded by the operator, the trunk relay group will be designed so that the recording device does not work for such calls.



  So that the subscriber does not have to stop sending digits until a group of long distance relays is found, a device for preserving and regenerating the pulses can be inserted in any intermediate stage. As only the first digits of a number are normally required by the channel discriminator, the preservation and regeneration device can be arranged so that it immediately retransmits only those digits which are required by this discriminator. . The remaining digits will be kept until all discrimination digits have been returned by the lane discriminator,

    after which they can be retransmitted to complete the establishment of communication.



  In the event that the DSR of the satellite office is replaced by an ordinary selector having access to a common discrimination device, as has been said previously, the device for storing and regenerating this device can be provided in such a way. that it has control of the retransmission of the pulses, which avoids the use of an intermediate device for conservation and regeneration.



  In the installation shown, account is taken of the fact that currently the emission of the digit "0", in a district with recorder-translators, triggers the commissioning of a recorder-translator which is also set up. service when another digit or other digits are sent, this recorder-translator giving access to different directions, so that the call is directed to an operator position, when the digit "0 is sent ", or to another subscriber when other digits are sent.

    It is proposed to provide a special group of simplified recorder-translators for level 0, these being arranged in such a way that all calls requiring the use of a recording device are preceded by the number "0" followed by 'another additional digit, as required, and the complete number of the subscriber called in the requested office.



  If the first digit sent is "0" and it is not followed by another digit in a short space of time, for example three seconds, the call will be directed to a manual table via from which a long distance communication can be established if desired, while the call can also be directed to this manual table if the digits "00" are transmitted, the transmission of these two digits being the new method to use to call an operator.



  If two of the digits 01 to 09 are sent as the first digits, you will have access to channels for which the possibility of recording calls is required. If a subscriber using a prepaid set, sends the digit "0" alone as the first digit, he will be connected immediately to a manual table or else the so-called "number inaccessible" tone will be returned to him through the intermediary. of the first group selector to be put into service.



  Each office will therefore be provided with a single troop of recorders-translators: s for level 0 which provide access to the means for directing the traffic at a distance, whether it is handled on a fully automatic basis or by the 'intermediary of a manual table. These recorder-translators, in turn, will be arranged so as to provide access to recorder-translators grouped together in a central office in the zone.



  According to this provision, a special group of recorder-translators is provided at the office of origin for the establishment of communications requiring the recording of the call, whether these recordings are made by an operator or automatically.



       Since the number of channels which must be discriminated by these translators will be small compared to the number of translations which must be performed by translators serving other levels of cipher switches. <I, these devices may be of simpler construction.

   As has been described in relation to the first method, it is necessary, when establishing a call which is to be recorded, to direct the call from the calling office to a sub-central office which carries traffic to the requested office, after which the entire number is repeated to it; in order to store and retransmit the requested number, the special group of recorder-translators at level 0 may be provided with electromechanical devices for storage and regeneration of pulses of the type already mentioned.



  As a variant it is possible to arrange that, for example, in the case of a call from office F of the fit. 4 to office E, the level 0 recorder-translator at office F does not direct the call to tandem office 13, which is closest to office E, when a code number is issued long distance starting with the digits of <B> 01 </B> at 09, but to simply direct the call to the neighboring tandem office to which office F is connected, with the call recording devices, for offices such as F, installed at the office D.



  The advantage of this arrangement is that level 0 translators in each group of offices working with a neighboring tandem office should only be provided to perform two channel discriminations, one to a manual position at the neighboring tandem office and another to a relay group of this office which gives access first to a recorder-translator or route discriminator which carries out the call routing to the requested office and secondly to the recording devices of the call.

   This method makes it possible to reduce to a minimum the translating organs of level 0. A level U recorder-translator of this type will be described later with reference to fit. 6 and 7.



  In typical fit junction diagrams. 1 to 5 which have just been described, the circuits of most of the devices which are represented therein are known to persons skilled in the art of automatic telephony, in certain cases the patent numbers (relating to them have been recalled .



  However, we will study the mode of operation of the circuits put into service for the establishment of communications through a level 0 recorder-translator located in an office, such as F, in the area with recorders-translators. of the fit.

   4, it being understood that such recorder-translators can, when transmitting the digit "n" or the digits "00", direct the call to a manual table of the neighboring tandem office D and, when transmitting any group (the two digits of <B> 01 </B> <a, 09, direct the call to office D, after which the number sent will be repeated in full, in an unchanged form,

       to this office with the exception of the first digit "0" which is no longer of any use for the establishment of the communication.



  A group of interurban relays is put into service at office D and gives first access to a recorder-translator who has the option of directing the call to any of the offices located outside the zone, either directly or via the intermediary with other offices in this area. The trunk relay group may also provide access to the call recording apparatus of the type which has already been described.



  Referring now to Figs. 6 and 7, it can be seen that the recorder-translator shown there has a rotary step switch F which receives the second digit of the called number and directs the call to the manual table of the neighboring tandem office or to the group long distance relay, depending on the second digit that has been sent.



  In order to be able to direct and record the call, it is also necessary to have the details of the number called in full at the tandem office, the storage and retransmission of this information being carried out by means of a mechanical storage device and regeneration of pulses of the type already mentioned.



  With regard to the mode of operation of the circuits, it should be understood that the circuits of the primary code selector and the selector of the first digit A may be of the type described in British Patent No. 469184 which also sets out the characteristics of a recorder-translator of the ordinary type. When a selector in figure A activates the level 0 recorder-translator in fig. 6 and 7, after the emission of the first digit "0", its friction switch relay operates when the switch meets the polarity indicating that the recorder-translator is free.

   This po larity is connected to wire P through the upper winding of relay A, in parallel with resistor YA; a ground is therefore brought to excite the relay A which, in turn, operates the relay B, in series with the electromagnet RM (which does not work under these conditions), this relay operates the relay BB . When the BB relay operates, at contact bb8, it supplies the P relay;

      at contact bb5, it connects the earth to the common wire 11 for starting the motor, to start the equipment generating the S and Z pulses associated with the TD and M relays and to start the motor which controls the IMPI and IMP2 springs which provide the impulses required by the registrar-translator for the transmission of the translated code.

   At contact bb7, the excitation circuit of the receiver electromagnet RM of the regenerator is prepared; on contact bb8, the circuit of the electromagnet FM of the electromagnetic clutch switch F closes at one point; finally, at contact bb9, the upper winding of relay A is disconnected from the incoming wire P, but this relay remains in the working position, because the impulse wire <B> PU </B> remains connected to earth at the contact of the primary code selector pulse relay.

      The transmitted digit received by the recorder-translator will be any of the digits between 1 and 0, the impulses will be received by relay A which operates, repeats them, at contact a2, towards the FM electromagnet which does not turn by step the wipers of the switch to a position corresponding to the number emitted.

   At the same time, on contact al, the train of pulses is repeated towards the receiving electromagnet RM of the regenerator; it should be noted that the resistance <I> YB </I> in series with the electromagnet is short-circuited at this moment by the contact bb7, so that the electromagnet can operate under the actio of the pulses; resistance <I> YB </I> serves to prevent premature operation of the RM electromagnet during operation of relay A.



  While sending the pulse train, relay B is intermittently short-circuited to contact al; it remains, however, in the working position owing to the delay in releasing the short-circuit; however, relay C operates the first time relay A drops out; consequently, it remains in the working position for the entire duration (the sending of the pulse train, in its contapt cl it supplies the marking electromagnet 311'I of the regenerator.



  If we briefly consider the operation of the device for preserving and regenerating the pulses, it will be noted from a close point of view the details which were given in the description of the basic patent that it essentially comprises a receiving disk and a transmitting disk. which are arranged on either side of a plate carrying a circular row of pins.

   The receiving disk rotates step by step under the action of the pulses received by the electromagnet 1i11, it moves with it a marking lever which is released when the marking electromagnet i1131 is de-energized. At the end of sending each pulse train, this lever then pushes back a pin. corresponding to the emitted number, through the plate carrying these pins and places it on the path of the emitting disc.

    For each digit received, a corresponding pin is pushed through the plate; these pins are used to regulate the movement of the emitter disc which controls the generation of the impulses by the springs <I> 131P3 </I> of the generator.



  Returning to the conservation of the first digit by the regenerator, it can be seen that when the electromagnet 13I operates and starts to. rotate the receiver disc step by step, the first displacement of this disc causes the springs to operate mechanically (the head of the regenerator, which prepares the power supply circuit for the ON relay via the contacts <B> NI. </B>



  At the end of the sending of the pulse train, the relay A remains constantly in the working position, and when the relay C drops, after the delay period due to the short-circuit of, "its winding, the circuit of the 'marking electromagnet <I> 3131 </I> opens and this electromagnet falls, causing the release of the lever carried by the receiver disc which pushes a pin, corresponding to the number emitted, on the path of the emitter disc.



  At the same time, the rrarrt contact, controlled by the marking electromagnet, closes after being opened during the excitation of the electromagnet, thereby establishing the relay circuit. <I> ON </I> which operates and locks for the duration of the silence in position, via its contact ota1, the head contacts <B> <I> NI </I> </B> and earth.



  Since the regenerator electromagnet Rll is supplied through contact a1 and the electromagnet F31 of switch F is supplied through contact a2, the second digit is stored at the same time in the regenerator and the switch F.



  It should be remembered that in the case where the calling subscriber wishes to be put in communication with him, the subscriber connected to a manual table, the two digits "00" must be sent; in these circumstances, the second digit "0" will be kept by the regenerator, while the switch F will be brought to position 11.

   The contact 11 of the bank F4 is connected to a terminal 12 so that, when the relay C drops out at the end of the sending of the pulse train, a ground is connected, through the wiper and the bank F4, to relay S31 which operates; this, in a way that will be. described later, causes routing. of the call to. manual table.

   Contacts 2 to 10 of bank F4, corresponding to a second digit between 1 and 9, which is emitted when an interurban communication is to be established, are connected to a terminal 13, so that it is the relay <B> S </B> C which works in this case; bare contact sc2 it closes its own blocking circuit.



  When one of the digits between 1 and 9 has been transmitted as the second digit, the recorder.r-translator sends back trains of pulses to direct the call to the neighboring tandem office, and when the SE relay operates , the relay IC circuit is prepared.



  Two 131P2 pulse springs are connected in parallel on this relay, these springs work in conjunction with the 131P1 outgoing pulse springs in such a way that when the 131P1 springs are closed, the I @ lIP2 springs are open and vice versa. The motor which drives these pulse springs has been started beforehand and when the pulse springs IMP2 open their contact for the first time, after the operation of the relay SC, the relay IG operates.

   At contact ig1, the impulse springs IMP2 are connected to the electromagnet FM of switch F; on contact g2, the short-circuit placed on the impulse springs IMP1 is removed.



  At contacts ig3 and ig4, the circuits of relays SC and SM are disconnected from bank F4 of switch F and bank FS is connected, through contacts ig5, to relay SZ, so that it can be used. now for the purpose of controlling the total number of pulse trains to be emitted by the recorder-translator. At contact ig6, the earth connected to rubbers F4 and F8 is made independent of contact c2, so that, if other trains of pulses are received during a transmission in progress,

   each operation and each release of relay C which result therefrom have no effect on this portion of the circuit. The relationship which exists between the pulse springs 1111P1 and IMP2, as it has just been described, is such that for each step taken by the switch F under the action of the pulse springs IMP2 a pulse is emitted on the left positive and negative wires, via IMPI pulse springs <I>;

   </I> At the start, however, the impulse springs IMP1 are short-circuited via the contact sm4 at rest, the wiper F2 in any position from 1 to 11, and the connection made between the terminals 16 and the upper spring of the impulse springs.



  Assume at this point that, in order to route the call to a trunk relay group of the neighboring tandem office, it will be necessary for the recorder controller to transmit discriminator digits 3148; these discriminating digits will therefore be transmitted after the transmission of any one of the groups of digits 01 to 09 indicative of a long distance call.



  If we now consider the advancement of switch F under the action of the springs IMP2, we can see that the impulse springs IMPl are inoperative until the wiper F2 has reached the twelfth position, which cuts the short course. -circuit placed at the terminals of these springs. Three pulses will be emitted on the line while the slider F2 passes to position 15;

   these pulses have the effect of raising the wipers of the primary code selector to level 3, in the well known manner. The next four contacts of the banks are joined together such that while the wiper passes over these contacts the impulse springs are again short-circuited, which gives an interval between sending two digits.

   The following code digits 1, 4 and 8 are generated in an identical manner, control of the F2 slider being transferred to the F6 slider when the F2 broom leaves its bench, the call being directed to the tandem office via a group of relays leaving the home office, as will be described below.



  When the F6 wipers reach position 40, all the discriminator digits will have been sent and the SZ relay circuit closes via the F8 wiper in position 40; this relay is blocked at its szl contact, it cuts the FM electromagnet excitation circuit at the sr2 contact, finally at the sz3 contact, it short-circuits the pulse springs 1111P1 and enters the outgoing loop the regenerator pulse springs IMP3.



  At this point in the establishment of communication, a group of interurban relays from the neighboring tandem office will have been put into operation; The mission of this relay group is to provide access to a recorder-translator of the common group who will direct the call to the desired office located outside the area. In order to defer the transmission of other digits until a recorder-translator has been put into service, we have arranged for the battery connections to. the line in the trunk relay group are such that relay D is inoperative.



  When a free recorder-translator is found, the polarities of the battery are reversed, so that the JIR A rectifier becomes conductive and the 1IRR rectifier non-conductive; relay <I> D </I> works under these conditions. Relay D, in operation, energizes relay SS at contact d3, which closes the supply circuit of the emitting electromagnet P11 of the regenerator.



  It should be understood that the spindle of the re generator which has. been moved to mark the end of the transmission of the previous call is. pushed out of the path of the transmitter disc and that it returns to the normal position under the action of the. reset pin designated by the letters PP, and switched on with relay P, but because the reset pin has an inclined plane head, the emitter disc is not released immediately and remains blocked until the electromagnet <i> Tilt </I> be de-excited.



  At its tin contacts, the electromagnet T. It cuts the circuit of the relay P which, at the contact p ?, opens the supply circuit of the electromagnet, as has been described in detail in the Patent No 194044; the sender disc is released, it rotates until the reset pin reaches the stop pin, which indicates the end of the sending of the first train of pulses.



  While sending the pulse train it should be noted that, since the reset pin RP does not connect ù, no stop pin such as SP, the relay P cannot be re-energized, while during:

   this time, the first digit received by the recorder-translator is returned in a regenerated form via the pulse springs DlP1, controlled by the regenerator device, this figure being sent to the recorder-translator, track discriminator, commissioned at the tandem office.



  When relay P drops, we can see that the circuit of relay IS, delayed at. release, closes via contact p2; this relay is used to give the next interval between sending two digits.



       Before and during this action, other trains of pulses may be received by the receiving disk and it will be understood that the operations of receiving certain digits and retransmitting previous digits may be performed simultaneously, but independently of one of the other.



  When the transmitting disk comes up against the stop pin, which marks the end of the sending of the first pulse train, the P relay operates again and the IS relay is de-energized. After the relay relaxation time <B> 18 </B> which determines the pause time between sending two digits, the TJI transmitting electromagnet is momentarily energized again to release the transmitting disk once more and to generate a second pulse train of the manner which has been described.



  When all the digits received have been transmitted again, the transmitting disk meshes with the receiving disk; therefore, the head contacts <B> NI </B> open and; release the ON relay.

   In addition, if the entire number has been transmitted and transmitted correctly, the channel discriminator will receive a full group of digits to direct the call to the called subscriber; the result is that the battery connections to the line wires are reestablished as normal, so that the relay <I> D </I> falls and excites the relay <I> CO </I> in the following circuit: earth, contacts, dl, <I> p3, </I> ss-1 and is2, F3 wiper <I> or F7 </I> of switch F, bank contacts, contact ort.3, negative.



  When the CO relay operates, it disconnects, at the col contact, the marking negative of the incoming wire P, which de-energizes the switching relay of the selector wipers of the digit _l. This relay, when returning to standby, causes the return of the digit A selector to its normal position and the sending of a signal to the primary code selector, so that the latter releases the connection to the recorder-translator. and connects the special restricted service subscriber. Means will be provided at the central point in question to effect the separation of the various categories of traffic.



  Referring now to fig. 6, it can be seen that two groups of primary code selectors ICS (CB) and ICS are provided at the calling office for subscribers using prepaid sets and for ordinary subscribers respectively, each of these having access to the same group of 'LRT local registrars-translators, the other devices being the same as those described in relation to FIG. 5.

   The normal and special primary code selectors. have access, through a level such as level 8, to the outgoing junctions to the main office and this level will be used in the event that both categories of subscribers need to have access to a manual position at the office under -central. In concordance with the discrimination number received by the TISR arrival selector, at the sub-central office, access can be given either to an ordinary manual position via the jack marked 00, or to suburban, interurban or telegram recording via the jacks marked TRU,

            TOL, <I> TEL. </I> Other categories of communications, which must be established through a manual position, can be accessed through other levels of the TISR selector and other jacks. The discrimination towards these positions will be carried out according to the category to which the calling subscriber belongs, the discrimination signals being retransmitted from the group of ORS starting relays, in accordance with the particular type of primary code selector which caused its commissioning.

   In the case of a call made by an ordinary subscriber, arrangements can be made so that, as soon as the attendant has plugged into the jack, the identification devices are activated by the group of outgoing relays. <I> ORS </I> from the local office, after which the calling number is transmitted to the central point or so that the starting of the identification devices is placed under the control of the operator.



  This arrangement will generally be used for operators at positions 00, since these can, in certain cases, help subscribers; in other cases, it could happen that the operator makes a call to an office which requires the recording of the call, when it would be necessary for her to know the identity of the 'calling subscriber. In all cases, the calling number will preferably be made visible in some form in front of the operator, the time during which the number appears in front of the operator being controlled by herself.



  It should be noted that level 1 of the TISR input selector is intended to make the connection to the SRI and SR2 output selectors, via the TLRS interurban relay group, and that we will arrange for that when a calling subscriber desires such a connection to be established, the primary code selector of the local office be brought up to a certain level, such as level 7, so that if the calling subscriber is a ordinary subscriber, communication can be established in the manner which has been described in relation to FIG. 5,

   whereas if the calling subscriber uses a prepaid set, the communication cannot be established, because the primary code selector ICS (CB) does not have access to the outgoing junctions via level 7. A tone called "tone number unreachable "is, in this case, returned to the calling subscriber and the activated recorder-translator is released.



  With regard to the flow of incoming calls coming from offices located outside the zone and intended for a network of several offices with recorder-translators, direct connections between the calling office or the main office will be provided. of the calling network and one of the central or sub-central offices of the network with recorders-translators.

   The incoming junctions preferably lead to a new row of primary code selectors, these have access to ordinary recorder-translators mounted in the sub-central office, and call routing to offices located there. The interior of the zone with recorders-translators will be carried out in the ordinary well-known manner.



  As regards the taxation of communications of this kind, the discriminatory equipment will be provided at the office of origin; its task will be to determine whether the charging should be effected by ordinary metering or by call recording.



  These discriminators will be provided with devices for preserving and regenerating the pulses, so as to allow several or all of the digits transmitted to be repeated to the sub-central office, in order to establish communication via the recorder-translators. of the sub-central office. In the event that a call requires recording, the discriminator at the office of origin will be designed so that it transmits a signal to the sub-central office to activate the recording devices. the call.

   The recording device will retain the characteristics of the number of the subscriber called for the duration of the conversation; the identity of the calling subscriber will be established and maintained by a group of outgoing relays at the originating office. At the end of the conversation, a print or record controller will be put into operation and the information required for charging will be communicated to this apparatus in the manner which has already been described.



  In the typical junction diagrams of Figs. 1 to. 6, which have just been described, the circuits of most devices which. Represented therein are known to persons skilled in the art of automatic telephony; in some cases the relevant patent numbers have been recalled.



  However, we will study the mode of operation of the circuits put into service for
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   When a selector in figure A activates the level 0 recorder-translator in fig. 8 and 9, after the emission of the first digit "0", its friction switch relay operates when the switch meets the polarity indicating that the recorder-translator is free.

   This polarity is connected to wire P through the upper winding of relay A, in parallel with resistor YA; an earth is therefore brought to energize relay A which, in turn, operates relay B, in series with the electromagnet RM (which does not work under these conditions), this relay operates relay BB. When relay BB operates, at contact bb3, it powers relay P;

   at contact bb5, it connects the earth to the common wire 11 for starting the motor, to start up the equipment generating the .S and Z pulses associated with the TD and M relays and to start the motor which controls the ZMP1 springs and IMP2 which provide the pulses required by the recorder-translator for the transmission of the translated code.

   At contact bb7, the excitation circuit of the receiver electromagnet RM of the regenerator is prepared; on contact bb8, the circuit of the electromagnet FM of the electromagnetic clutch switch F closes at one point; finally, at contact bb9, the upper winding of relay A is disconnected from the incoming wire P, but this relay remains in the working position, because the impulse wire <I> PU </I> remains connected to earth at the contact of the primary code selector pulse relay.



  The emitted digit received by the recorder-translator will be any of the digits between 1 and 0, the pulses will be received by relays A which, when operating, repeat them, at contact a2, towards the electromagnet. FM which turns the wipers of the switch step by step to a position corresponding to the number emitted.

   At the same time, on contact al, the pulse train is repeated towards the receiving electromagnet RM <B> 1 </B> of the regenerator; it is â, to note that the resistance <I> YB </I> in series with the electromagnet is short-circuited at this moment by the contact bb7, so that the electromagnet can operate under the action of the pulses, the resistance <I> YB </I> serves to prevent premature operation of the RM electromagnet during operation of relay A.



  While sending the pulse train, relay B is intermittently short-circuited to contact a1; however, it remains in the working position as a result of the release delay caused by this short circuit; however, relay C operates the first time relay A drops out; consequently, it remains in the working position for the duration of the sending of the pulse train; on contact cl, it supplies the regenerator's marking electromagnet MM.



  If we briefly consider the operation of the device for preserving and regenerating the pulses, it will be noted from the details which have been given in the description of the basic patent, that it essentially comprises a receiving disk and a transmitting disk. which are arranged on either side of a plate carrying a circular row of pins.

   The receiving disc rotates step by step under the action of the pulses received by the electromagnet RM, it moves with it a marking lever which is released when the marking electromagnet MM is energized at the end of the 'sending each train of pulses, this lever then pushes a pin, corresponding to the transmitted number, through the plate carrying these pins and places it on the path of the transmitter disc. For each digit received, a corresponding pin is pushed through the plate; these pins are used to adjust the movement of the emitter disc which controls the generation of pulses by the springs IMP3 of the generator.

    



  Returning to the conservation of the first digit by the regenerator, it can be seen that, when the RM electromagnet operates and begins to rotate the receiving disk step by step, the first displacement of this disk mechanically operates the head springs of the regenerator, which prepares the relay supply circuit <I> ON </I> through NI contacts.



  At the end of the sending of the pulse train, the relay -4 remains constantly in the working position and when the relay C drops, after the delay period due to the short-circuit of its winding, the electro circuit -marking magnet MM opens and this electromagnet falls, causing the release of the lever carried by the receiver disc which pushes a pin, corresponding to the number emitted, on the path of the emitter disc.



  At the same time, the wam contact, controlled by the marking electromagnet, closes after being opened while the electromagnet is being energized; in doing so, it establishes the relay circuit <I> ON </I> which operates and locks for the duration of the positioning, through its onl con tact, the N1 head contacts and the earth.



  Due to the fact that the electromagnet <B> Bill </B> of the regenerator is supplied through contact al and the electromagnet FM of switch F is supplied through contact a2, the second digit is stored at the same time in the regenerator and switch F .



  It should be remembered that in the event that the calling subscriber wishes to be put in communication with a subscriber connected to a manual table, the two digits ,, 00 "must be sent; in these circumstances, the second digit" 0 " will be kept by the regenerator, while switch F will be set to position 11. Contact 11 of bank F4 is connected to a terminal 12, so that, when relay C drops out at the end of sending the pulse train, a ground is connected, via the wiper and the bank F4, to the SM relay which operates; this, in a manner which will be described later, causes the call to be routed to the table ma nuelle.

   Contacts 2 to 10 of bank F4, corresponding to a second digit between 1 and 9, which is emitted when a long distance communication is to be established, are connected to a terminal 13, so that it is the relay. <B> SC </B> which works in this case; on contact sc2, it closes its own blocking circuit.



  When digits between 1 and-, 9 have been sent mi as the second digit, the recorder-translator sends back pulse trains to direct the call to the neighboring tandem office, and when the SE relay operates , the IG relay circuit is prepared.



  Two impulse springs IMP2 are connected in parallel on this relay, these springs work in conjunction with the impulse springs IMP1 of outgoing impulses, in such a way that when the springs IMP1 are closed, the springs LIIP2 are open and vice versa. .



  The motor which drives these pulse springs has been started beforehand, and when the pulse springs IHP2 open their contact for the first time, after the operation of the relay SC, the relay IG operates. At contact ïgl, the pulse outputs IJIP2 are connected to. the electromagnet <I> FM </I> switch F; on contact zg2, the short-circuit placed on the impulse springs 1a11'1 is eliminated.

    At contacts ig3 and ig4, the circuits of relays SC and SM are disconnected from bank F4 of switch F and bank F8 is connected, through contacts ig5, to relay SZ, so that it can be now used for the purpose of controlling the total number of pulse trains to be emitted by the trans- borer. t1 .u contact ig6,

      the earth connected to the wipers F4 and F8 is made independent of the contact c2, so that, if other trains of pulses are received during a transmission in progress, each operation and each release of the relay C which result therefrom is without effect on this portion of the circuit.



  The relation which exists between the impulse springs IMP1 and IMP2, as it has just been described, is such that for each step taken by the switch F under the action of the impulse springs IMP2, a pulse is emitted on the left positive and negative wires, via the pulse springs <i> I </I> IIPl <I>;

   </I> At the start, however, the impi impulse springs are short-circuited via the contact sm4 at rest, the wiper F2 in any position from 1 to 11, and the connection made between the terminals 16 and the upper spring of the impulse springs.



  Assume at this point that in order to direct the call to a trunk relay group of the neighboring tandem office, it will be necessary for the recorder controller to transmit the discriminator digits 8148, these discriminator digits will therefore be transmitted after the emission of any of the groups of digits <B> 01 </B> at 09 codes for a long distance call.



  If we now consider the advancement of switch F under the action of the ElTIP2 springs, we can see that the EIIP1 impulse springs are inoperative until the contactor F2 has reached the twelfth position, which cuts the short course. -circuit placed at the terminals of these springs. Three pulses will be emitted on the line while the slider F2 passes to position 15, these pulses have the effect of raising the wipers of the primary code selector to level 3, in the well known manner.

   The next four contacts of the banks are joined together, so that while the slider passes over these contacts, the impulse springs are again short-circuited, resulting in an interval between sending two digits. The following code digits 1, 4 and 8 are generated in an identical manner, control of the F2 slider being transferred to the F6 slider when the F2 broom leaves its bench,) 'the call being directed to the tandem office via 'a group of relays starting from the home office, as will be described below.



  When the F6 wipers reach position 40, all the discriminator digits will have been sent and the SZ relay circuit closes via the F8 wiper in position 40;

   this relay is blocked at its contact se-1, it cuts the excitation circuit of the electromagnet Flll at the contact sr2, finally, at the contact sz8, it short-circuits the impinging springs IMP1 and introduces in the outgoing loop the impulse springs IMP3 of the generator.



  At this point in the establishment of communication, a group of interurban relays from the neighboring tandem office will have been put into operation, this group of relays has for mission to provide access to a recorder-translator of the common group who will direct the communication. 'call to the desired office outside the area.

    In order to defer the transmission of other digits until a recorder-translator has been put into service, an arrangement has been made so that the connections from the battery to the line in the trunk relay group are as follows. that relay D is inoperative.



       , When a free recorder-translator is found, the polarities of the battery are reversed, so that the rectifier MRA becomes conductive and the rectifier MR13 non-conductive; relay <I> D </I> works under these conditions. Relay D, when operating, energizes relay SS at contact d3, which closes the supply circuit of the emitting solenoid RM of the regenerator.



       It should be understood that the spindle of the regenerator which was moved to mark the end of the transmission of the previous call is pushed out of the path of the transmitter disc and that it returns to the normal position under the action of the reset pin designated by the letters RP, and switched on with relay P, but because the reset pin has an inclined plane head, the emitter disc is not released immediately and it remains blocked until the electromagnet <I> TM </I> be de-excited.



  At its tm contacts, the electromagnet <I> TM </I> cuts the circuit of relay P which, on contact p2, opens the supply circuit of the electromagnet, as has been described in detail in patent No. 194044; the sender disc is released; it rotates until the reset pin reaches the stop pin, which indicates the end of sending the first train of pulses.



  While sending the pulse train, it should be noted that since the reset BP pin does not connect to. no stop pin such as SP, relay P cannot be re-energized, while during this time the first digit received by the recorder-translator is returned in a regenerated form via the springs of IMPI pulses, controlled by the regenerator device, this figure being sent to the recorder-translator, channel discriminator, put into service at the tandem office.



       When relay P drops out, it can be seen that the circuit of relay IS, delayed on release, closes by means of contact p2; this relay is used to give the next interval before sending two digits.



  Before and during this action, other pulse trains may be received by the receiving disk and it will be understood that the operations of receiving certain digits and retransmitting previous digits may be performed simultaneously, but independently of one of the other.



  When the transmitting disk comes up against the stop pin, which marks the end of the sending of the first pulse train, the P relay operates again and the IS relay is de-energized. After the relaxation time of the IS relay which determines the pause time between sending two digits, the emitting electromagnet <I> TM </I> is energized again momentarily to release the sender disk once more and to generate a second train of pulses in the manner which has been described.



  When all the digits received have been transmitted again, the transmitting disc meshes with the receiving disc; therefore, the NI head contacts open and cause the relay to release <I> ON. </I> In addition, if the entire number has been transmitted and transmitted correctly, the channel discriminator will receive a complete group of digits to direct the call to the called subscriber, as a result the connections of the battery to the line wires are restored to normal, so that relay D drops out and energizes the CO relay in the following circuit: earth, contacts <I> dl, p3, </I> s82 and is2, wiper F3 or F7 of switch F, bench contacts, contact on3, negative.

    



  When the CO relay operates, it disconnects, at the neck contact, the marking negative of the incoming wire P, which de-energizes the switching relay of the selector wipers of the number A. This relay, returning to idle, causes the return to the normal position of the digit A selector and sending a signal to the primary code selector, so that the latter releases the connection to the recorder-translator and connects the calling subscriber to the tandem office neighbor, through to the starting relay group.

   When the switch relay of the number 21 selector drops, it also cuts the circuit of relay A of the recorder controller, which borrows the wire. <I> PU; </I> As a result, relays B, BB and other relays, including the SS relay, are released; the circuit for returning to the rest position of switch F closes via the earth, contact i82, wipers and banks F3 or F7, contact switches <i> f m </I> of the electromagnet, the switch F, the contact bb8, the electromagnet F and the negative.

   The wipers of switch F therefore rotate until they reach the rest position 1 where the circuit described above is cut by wiper 3 on contact 1.



  The recorder-translator and the switch of digit A are again available for other uses and the connection is established in a manner which will be described later.



  In the case where the first two digits sent by the calling subscriber are the digits "00", the relay SM is supplied at the end of the sending of the second digit, through the wiper and the bank F4. When this relay operates, on contact sm1, it energizes relay S; at contact sm4, it connects banks F1 and F5 to the impulse springs IMPI, so that, in the present example, it directs the call via discriminator digits, such as 3147, to a posi manual operation of the neighboring tandem office.

   It should also be noted that in this case, the circuit of the relay SZ is closed via the contact 39 of the bank F8, of the terminal 15 and of the closed contacts sm2 and ig5. In the case of a call to a manual position, it is not necessary for the regenerator to retransmit direct command digits;

   it follows that as soon as the relay SZ operates, the circuit of the CO relay is closed by the intermediary of the contacts sm3 and sz4, so as to cause the release of the recorder-translator and of the selector of figure A .

    In this case, therefore, when the CO relay operates, the number "0" will be kept in the regenerator, and when the relays <I> A, B </I> and BB fall, the relay <I> ON, </I> returning to the working position, keeps relay P energized;

   on contact bb6, the IS circuit will close through the earthed s4 contact and during the relay relaxation time <B> S S. </B> The relay IS, while functioning, keeps the circuit of the relay SS closed by means of the earth and the contacts is3, o24 and ssl.



  During the time which elapses between the release of relay B and the next operation of relay IS, the earth is brought through the contacts p2, b1 and isl, to excite the transmitting electromagnet <I> TM </I> of the regenerator. When the IS relay operates, this circuit is cut and the electromagnet TM being de-energized, causes the transmission of the number "0" kept by the regenerator.

    The transmission of this figure in the present case has no effect since from the start of transmission of the figure stored by the regenerator, relay P is at rest and bypasses the pulse springs IMP3 of the regenerator. When the complete train of pulses has been transmitted, the relay <I> ON </I> falls in turn;

   it releases the SS and IS relays, when these two relays are in the rest position, the earth is brought via the bbl, ss2 and is2 contacts, the wipers and the F3 or F7 banks to return the switch F; the recorder-translator is now available for other functions.



  Note that when the translator recorder is put into service, the thermostatic relay circuit <I> TH </I> is closed by the intermediary of contacts bbl and c2 and of the friction device F4 in position 1. This relay takes about four seconds to close its contacts; it follows that if the calling subscriber only transmits a single digit "0" and then waits four seconds or more, the relay <I> TH </I> will work; on its thl contact, it will trigger the excitation of the SM and SC relays, which directs the call to the operator of the tandem office.



  In the case of an automatic long distance call, if the calling subscriber takes a longer time than a determined period to complete the transmission of the called number, the TP and M relays operate as follows: the common wires S and Z , connected to these relays, extend towards a late group comprising the S and Z pulse cams arranged to give earth pulses on these wires with a well-defined time relation.

   When relay B has operated in the recorder-translator, an S impulse activates the TP relay which is blocked by the action of its lower winding. On receipt of a Z pulse which can, for example, be given 30 seconds after the S pulse, the M relay operates under the action of its upper winding and is blocked under the action of its winding lower, via the earth and the m3 and bb2 contacts. On contact ml, the SS relay circuit closes;

   at contact m2, the outgoing loop is cut to free the selection train which has been put into service by the recorder-translator. At contact m4, relay A is disconnected from the wire <B> PU </B> and it returns to idle, causing relays B, BB and SS to be released. The earth is also extended towards the forced release wire FB, via the contacts <I> b2, </I> is4 and ss6 while releasing SS relay,

      it will be understood that this causes the forced release of the selector of the digit A and the sending of a so-called "number inaccessible" tone to the calling subscriber, by the primary code selector. The registrar-translator is. also returned to the normal position where it became available for other uses.



  It will be appreciated that the recorder-translator can be adapted to emit different groups of channel discriminating digits when it receives different groups of digits from 01 to 09 and, in the case described in la, present description, the call will be directed directly from the office of origin to the tandem office, outside the. zone, after sending one of the groups of digits from 01 to 09;

       the recorder-translator must obviously be adapted to be able to emit two or more different groups of discriminating digits. In order to be able to apply this possibility, additional devices are necessary in the recorder-translator which, if the number of discriminating digit groups is sufficiently large, will be conceived approximately as the normal type of recorder-translator described in the British Patent No 4G91.81.



  Consideration will now be given to the operation of the circuits of the outgoing relay group at the originating office and of the long distance relay group at the neighboring tandem office.



  The starting relay group, which is re presented to the fib. 10, causes, when put into service, the activation of the calling line identification device by which it receives the indication of the identity of the calling number in the form of a code which is stored, in a pulse conservation and regeneration device, until the remote trunk relay group signals that it wishes to obtain this information.



  When the starting relay group is put into service, the earth is brought, through the P wire, to energize the relay 7t1; this relay supplies the relay 7B via its contact ja3; at the ja4 and jas contacts, it connects the incoming positive and negative wires at the outgoing junction to the neighboring tandem office. A loop allows both the repetition of the pulses is :. therefore established from the primary code selector.

    directly through the starting relay group, to the arrival selector of the neighboring tandem office; the remaining channel discriminator digits, transmitted by the recorder-translator, are used to direct the call to a group! the tandem office trunk relay, which is represented at fibs. 11 and 12.



  Returning to. operating mode of the outgoing relay group, it is assumed that immediately after it has been put into service, the identification device of the calling line will be activated to communicate the details of the identification of the number calling to the starting relay group, or it will be kept.

   On contact jlA, the relay JT, while operating, extends the earth via contact rb3. to energize relay r11, assuming that the connections between terminals 17 and 18 have been cut. In other circumstances, when it is assumed that the outgoing junctions to the tandem office are to serve registered traffic and counted traffic in an ordinary manner. pins 17 and 18 will be joined in such a way:

   due to relay 13: 1 cannot function due if a discriminator signal, in alternating current (indicating due call must be recorded), has been emitted on the primary wire P. to operate the IP relay and a common ordinary relay DC connected in a circuit rectifying the two halfwaves and comprising the rectifiers JIRC and JIRF, connected to the incoming wires P via the capacitor <B> QI). </B>



       When the RA relay operates, on contact raG, it closes the excitation circuit of the marking electromagnet. <i> 1 </I> JIJI of the regenerator, through contacts jb5, lpl and) -a6;

      to the contacts of ral 3r. îa5, it connects the starting relay group to the common wires leading to the calling line identification device.



  With regard to the calling line identifi cation apparatus, it must be taken as this is of the ordinary type, as already mentioned, in which the private wire associated with each line in a office is marked with a code which is the code for that particular line.

   The marking passes through the wire P of the connection established by the calling subscriber, it is received by the outgoing group of relays where this information is required.



  As to the code, this will preferably be of the well-known type with five units, in which each digit which is to be transmitted or stored consists of five parts, emitting signals in one or more of these parts, the different numbers will be translated. The parts without signals are called spacing pulses and those with a signal are tag pulses.

   In the five-unit code, each digit consists of two marking pulses and three spacing pulses, the marking signals being transmitted by the private wire to the starting relay group, the spacing or signaling pulses being data independently of the conversation wires, through common wires coming from the identification device and ending in the group of outgoing relays.

   Suppose, for example, that the five parts of the code are denoted by <I> V, W, X, </I> Y, Z respectively, the digit 1 will be transmitted by emitting a marking pulse in parts V, W, the code for the various digits being shown in the table below:

           VI_ 1 VX -2 WX-5 VY-3 WY-6 XY-3 VZ <i> -4 </I> WZ-7 XZ-9 YZ-0. Therefore, for a four-digit number, a total of four groups of five pulses each will be transmitted and may be stored in the pulse storage and regeneration device of the starting relay group as a five-code. units, as it was received.

   Each group of five consecutive pins in the regenerator forms a number, and the pins of each of these groups of five are moved in accordance with the received marking pulses.



  Returning to the operating mode of the starting relay group circuit, it can be seen that when the relay <I> BA </I> is working and that if the subscriber identification device or the line marking device, as it may alternatively be called, is not already in operation and does not perform an identification cycle, an earth will be connected on the common wire S, which will make the relay BB operate under the action of its right winding, this relay is blocked via the contacts brl and jb5 under l action of his left winding.

   At contact rb2, the 1BJI receiver electromagnet of the regenerator is connected to the pulse sending wire <B> PU, </B> ready to receive spacing pulses; on contact rb3, the initial relay excitation circuit <I> BA </I> is open and this circuit is kept working through the common wire Z which is connected to earth in the line marking device and which remains connected to earth until shortly before the end of the '' a complete identification cycle,

    that is, until the moment the earth is momentarily disconnected from this wire to signal the end of a cycle to all calls that have received full identification. On contact rb5, the earth is extended from the contact <I> ras </I> to the common ST start wire in order to initiate the start of a row marking cycle.

   During the identifica tion or cycle of line marking, each step causes sending on the wire <B> PU </B> With a positive spacer pulse, the IBM receiver electromagnet of the regenerator advances the receiver disc and scoring arm along the circular row of pins.



  Whenever an AC tagging pulse is received through the private wire, the IP relay operates; on its ip1 contact, it cuts the circuit of the 1MM marking electromagnet. When this electromagnet returns to rest, it releases the marking lever carried by the receiver disc and a pin which is in front of it is pushed back on the path of the transmitter disc,

   at the same time the hnin contacts controlled by the marking electromagnet close after they have been opened while the electromagnet was energized. As a result, the circuit of relay 11,11R is established through its left winding.

   The MJIR relay <I> to </I> its minr5 contact cuts the circuit of the IP relay which drops out and again energizes the 1MM marking electromagnet; on contact mmrl, it is blocked by means of its right winding and the impulse wire <I> PU </I> earthed, until sending the pulse is complete.



  At the end of the sending of the pulse, the M1'11 relay drops out and reconnects the 1P relay to the private wire, so that it is ready to receive a subsequent marking pulse. Assuming the subscriber's number is 1359, twenty code signals will be received by the regenerator; of these, pulses 1 and 2, 6 and 9, 12 and 13, 18 and 20 are marking pulses, the others being spacer pulses. Corresponding pins are moved in the row of twenty consecutive pins of the regenerator; in this way, the subscriber number can be stored as a code by means of the pins which have been moved.



  If the calling subscriber from an office with recorder-translators has a three-letter, four-digit number, the first part of the number will be the same for all subscribers connected to that office and can be received directly from the line marking equipment without having been transmitted through the speech circuit.



  The code signals characteristic of the first digits of the number are received from the line marking equipment through the common EC code wire which connects to the P wire and to the 1P relay through a nonlinear NLR resistor housing which, when a suitable alternating current is applied to the EC wire, its resistance decreases sufficiently for the IP relay to operate in series with it.

   The five-unit code is used to coin the first digits of the number to the pulse regenerator; when this is done, the digital part of the number is transmitted over the P wire in the manner which has already been described. When the identification cycle is complete, the earth is momentarily removed from the common wire Z and the relay A drops.

   The circuit then remains in this condition until the end (the communication when the calling subscriber hangs up his receiver, but before considering what is happening in this occurrence we will first study the conditions under which long distance communication via a long distance relay group from the neighboring tandem office.



  During the identification cycle that begins when the outgoing relay group is put into service, trains of discriminating pulses are sent through that group to direct the call to a group (the trunk relay of the neighboring tandem office, such as the one shown in Figs. 11 and 12.



  As has already been said in the description of the various junction diagrams, the function of this group of relays is, in the first place, to provide access for the intermediary of a rotary switch. <I> ILS at 25 </I> points to the translation and discrimination devices serving the switching train and then giving access to the call recording devices.

   It is also provided for keeping the called number in a device for storing and regenerating pulses, the duration of the communication which is also required for recording the call being determined in this device by means of two 10-point TS and US rotary switches, working in conjunction with the 25-point HS switch which is actuated by a given earth pulse every six seconds during conversation.



  Other details that are required for the purpose of recording the call, such as the identity of the calling subscriber and the time the call was requested, can be obtained from the outgoing relay group in the office. of origin as already described and of a common device, giving the date and time, to which the recording device has access when this information is required.



  When the trunk relay group is put into service, a loop circuit extends from relay D and a pulse spring of the home office recorder-translator of figs. 8 and 9, through the train of code selectors, the starting relay group, the junction to the tandem office and the train. arrival selection of this office to operate relay R of the long distance relay group of the same office.

   The polarities connected to the line through this relay are such that relay D does not work in the recorder-translator, so that it suspends the sending of the trains of pulses stored in the device. regenerator until access is given, via the searcher HS, to the equipment of a discriminator recorder-translator which serves the trunk switching train.



       When the relay R operates, at its contact r1, it causes the excitation of relay 1B which, in turn, operates the relay. <I> BA. </I> The BA relay, when operating, closes on contact <i> prom </I> its own blocking circuit; if contact beats, it extends a blocking earth to the wire P; in touch with <I> down, </I> it closes the excitation circuit of the KR relay; finally, on contact ba6, it closes the supply circuit of the MD relay.



  When the KR relay operates, at contact kr6, it closes the own control circuit of the HSM solenoid of the HS switch through the hsm switch contacts.



  It will be recalled that the HS researcher has access to recorder-translators or to printers, and we have arranged for the search to be carried out in the first place in the bank contacts connected to recorder-translators. This result has been obtained by arranging so that the circuit of the switch relay K of the wipers can only be closed through the bank contacts of the switch HS which are connected to recorders-translators when the wipers of this switch are in position on such contacts,

   a ground is connected to the test wiper H8 of the switch HS via the contact kr7, the bank and the wiper H89, the contacts lb4, k2 and krl, the resistor YC, the contact kr2 and the windings of the relay K in series.



  If the pin on which the HS switch wipers are located is occupied, relay K will not operate and the switch will advance the wipers to the next group of contacts. This action will continue until a free recorder-translator is found, that is, when the HSS slider encounters a negative; at this time, relay K will operate.

    While operating, it cuts the circuit of the electromagnet at contact k3, to stop the rotational movement of the switch; in touch with <I> k2, </I> it causes the KA relay to be excited; at contact k1, it connects a guard polarity to the HSS test brushes, through its low resistance lower winding.



  When the gA relay operates, at its contact 7ca1, it cuts the relay circuit <I> KR, </I> delayed on release, and energizes the KB relay; to contacts k3 and k4, the incoming negative and positive wires are connected to the searcher's wipers HS2 and HS3, the blocking circuit of relay R being maintained by means of resistance YF and contact ka5;

      finally, on contact 1ca6, it closes the excitation circuit of relay 1BB.



  The relay K, while operating, cuts, at contact k 2, a part of its initial excitation circuit, the supply of the upper winding of this relay is then given in the opposite direction to that of the lower winding. laughing, this circuit comprising: the earth, the contact k1, the upper winding, the contact kr2, the resistors YC and YD, the negative;

    this is done to give a suitable release of this relay in the case where two relays K of two groups of inter-office relays are switched in principle simultaneously on the same recorder-translator.



  In the case of a double connection, the two relays K operate under the action of the same marking negative, but the blocking flux produced in each of them under the action of the current flowing in the lower windings of the low resistance will be halved, with the opposite flux produced by the upper windings remaining equal to itself. Under these conditions, the two K relays drop out and their respective researchers continue to rotate.



  * Due to the difference in speed which always exists between any two switches, after a few steps one of them will reach a free spindle before the other. Therefore, the relay K which is associated with it will function to keep this pin and to cut the circuit of the control electromagnet.



  The supply of the upper winding of relay K in the opposite direction to that of the lower winding is maintained until the relay is released. <I> KR, </I> after which the upper winding circuit is cut and relay K remains blocked under the action of its lower winding alone.

    
EMI0024.0014
  
    When <SEP> the <SEP> relay <SEP> KB <SEP> and <SEP> 1BB <SEP> function, <SEP> the <SEP> contacts <SEP> <I> lebl </I> <SEP> and <SEP> <I> kb2, </I> <SEP> lbb5 <SEP> and <SEP> <i> lbb6 </I>
 <tb> <U> @ nn @ n @ fn <SEP> f <SEP> iÏe <SEP> nnei + ifni-nn @ i @ <SEP> çnt'd @ n1- <SEP> @ </U> nected through the trunk relay group to the train of the tandem office outgoing trunk switches.



  Note that the polarities connected to the negative and positive wires entering the tandem recorder-translator are the reverse of those given by relay P, so that relay D of the local recorder-translator will still operate. and causes the sent number to be sent which was stored in the pulse regenerator.



  This information is received in the register-translator of the tandem office which carries out the necessary translation to establish the communication with the requested subscriber, at the same time the information is communicated to the device for storing and regenerating the pulses of the inter-relay group 7 as will be described below.



  When the KB and 1BB relays operate, it should be noted that the electromagnets 21i'Y el; 2:

  11111 reception and marking are connected via the FIS4 and HS5 frotors to the recorder-translator put into service, and it should be noted that the marking electromagnet 2L1141 is energized immediately so that the lever is activated. releases the pins and to keep it ready for reception of the impulses by the 2PJI electromagnet.



  It should be understood that the decimal pulse trains received by are also translated into codes.
EMI0024.0068
  
    of <SEP> five <SEP> units, <SEP> like <SEP> he <SEP> a <SEP> summer <SEP> described <SEP> in <SEP> relation <SEP> with <SEP> the teammeulï <SEP> of <SEP> marking <SEP> of <SEP> line,
 <tb> these <SEP> trains <SEP> are <SEP> transmitted <SEP> by <SEP> the intermediary
 <tb> <U> rlnc # <SEP> 1 ", <SEP>., + <SEP> A <i> - </I> <SEP> <B> TTCyi </B> <SEP> "f- </U>
EMI0024.0069
  
    Batch <SEP> name <B> ................................... </B> <SEP>:

    <SEP> S450015EPP
 <tb> Country ......................................: <SEP> CH
 <tb> Patent <SEP> publication <SEP> number <B> .................... </B> <SEP>: <SEP> 0000000000238079
 <tb> Patent <SEP> type ..................................: <SEP> A
 <tb> <B> First <SEP> entry <SEP> operation </B>
 <tb> Post ....................: <SEP> 1
 <tb> Date ....................: <SEP> 05/16/89
 <tb> <B> Operator ................ <SEP>:

    <SEP> DEBBIE </B>
 <tb> <B> Patents <SEP> checking <SEP> operation </B>
 <tb> <B> Post </B>
EMI0024.0070
           certain pins in accordance with the particular numbers issued as has been described in connection with the storage of the calling number in the form of a code in the regenerator of the starting relay group.



  When the tan request recorder-translator finishes sending the discrimination digits to direct the call to the requested subscriber, its function is terminated, it therefore removes the contact marking negative on which the HS8 slider is found, which causes the. release of relay g from the trunk relay group.

   Relay K, on falling, in turn releases relays KA and KB and further, since the original office recorder-translator will have been removed from the circuit at this time, the conversation circuit will be established by the intermediary of the rest contacts ka3 and ka4,

      capacitors QA and QB and break contacts kbl and lcb2. Relay KB, when released, also closes, on contact kb3, the return circuit to the rest position of switch H'S, as follows:

   wire 21 earthed via the delayed alarm equipment which operates if the switch does not return to standby, kr7 contact, H89 wiper and bank, kr3 and kr5 con tacts depending on the position taken by the HS9 wiper on the bench , db5 contacts, <i> k 3 </I> and kb3, hsm switch contacts, HSM electromagnet, negative;

   the wipers of the HS switch therefore turn until they are in the rest position.



  At the end of the establishment of the call, the called subscriber is rung via the final selector of the remote office in the usual manner; when it responds, the battery polarities are reversed on the conversation wires, so that the MRL rectifier connected in series with the 1D relay of the trunk relay group becomes conductive and the MRK rectifier non-conductor.

   The 1D relay cannot therefore now operate in series with the delay impedance I; at contact 1d1, it cuts the circuit of the MD relay which has been kept working since the moment when the interurban relay group was put into service. At the same contact, the DD relay circuit closes; this relay, at contacts dof and dd2, repeats the inversion of the pola rities of the battery towards the primary code selector of the office of origin to give the necessary supervision.

   When the relay <I> MD </I> falls with a certain delay, the duration of which serves to prevent charging which could be due to the momentary operation of the 1D relay as a result of line faults, the circuit of the DB relay closes via the HS10 wiper in position 1.



  When the DB relay operates, it only locks at contact db1, and at contact db4, it connects pulse wire 23, giving earth every six seconds to the HSM electromagnet.



  A ground pulse is given to wire 23 every six seconds and, as a result, the HSM electromagnet advances the wipers of the HS switch step by step.

    We have arranged in this circuit so that charges are not carried out until the switch HS has advanced two steps, that is to say until a period of six to twelve seconds have elapsed; during this period, the calling subscriber has time to release the established connection if he has obtained a false number. This feature can be applied or waived at will.



  At the end of the period considered, the relay <B> PU </B> works by means of the HS10 brush in position 3; in touch with <I> pua, </I> the electromagnet ÜSM of the switch <I> US </I> giving the indication of the units of minutes, is connected to wire 23, so that the next pulse, given after six seconds, excites the electromagnet ÜSM; at the end of the pulse, the electromagnet falls back to advance the wipers ÜS1 and ÛS2 from the rest position to position 2, which indicates the beginning of the first minute.

   Relay <B> PU </B> then falls back until the HS switch has reached the position <B> 13; </B> when it works again, it takes the minute mechanism forwards by one step. reaches position 3, which indicates the start of the second minute. After a further advance of the switch HS by ten steps, that is to say after another minute, the switch US advances to position 4, which indicates the beginning of the third minute.



  When the HS10 brush reaches contact 25, the DP relay operates and is blocked via the dpl, db2, ba6 and earth contacts.

   The DP relay, while operating, prepares a new power circuit for the relay <I> PU </I> through the sixth contact of the HS10 bank, so that this relay operates again twelve seconds before the three minutes elapse, which occurs when the wiper <I> HS10 </I> reached contact <I> B. </I> When the relay <I> PU </I> works this time, it no longer closes the circuit of the electromagnet U811, because it is cut on contact dp4, but, on the other hand, a circuit is established, via the con dp5 tacts <I> and </I> pu4,

      to connect a tone transformer, connected to common wire 24, to the central winding of relay B from where a warning tone will be sent by induction on the line wire to let the subscriber know that the first tax period has ended. When the HS10 broom reaches the next 9 contact, an earth is born, through the contacts <I> put </I> and dp2, to bypass and release the DB relay; therefore, on contact db5, the return circuit in the rest position of the switch HS closes.

   The DP relay drops out when the DB relay is released, but the relay <I> PU </I> remains blocked, via the pul contacts and <B> M </B> and contact ba6 earthed, until the DB relay is re-energized when the search finder HS reaches its rest position.



  The HS switch then begins another cycle and three more minutes are recorded by the US switch. If the conversation continues, at the end of the ninth minute the wipers of the US switch will be moved from position 9 to position 1.0, in which the contacts u10 close mechanically and establish the excitation circuit of the electro-magnet TSll of the switch says tens of minutes.

   At the start of the tenth minute, the two electromagnets USII1 and TSM will receive an excitation pulse and they will bring the rubbers US1 and U82 to position 1 and the rubbers T ' <B> IF </B> and TS2 from position 1 to. position 2.

   The progress of the US and TS switches continues until the end of the conversation when the calling subscriber hangs up his receiver, and if it is assumed that a period of twenty minutes has been recorded, the units switch will have its wipers. returned to rest position 1, while the wipers of switch TS will be placed on contact 3. By using the two switches US and TS, a conversation lasting ninety-nine minutes can be recorded and the alert tones given to the subscriber at the start of each new three-minute period.



  When the calling subscriber hangs up, relays B, IB and 1BB in turn drop, relay B: 4 remains at work to control the group of long distance relays through its contact bat and to switch this relay group to the call recording device.



       The call is then recorded as described below. If you want to record only actual calls only, terminals 21 and 22, in the relay 10 circuit:

  V, will be linked together in such a way that if the DB relay did not work because the called subscriber did not answer the relay <I> ION </I> will work when releasing relay 1B to cut the excitation circuit of relay BA, to, its contact loic2, and to bring about the release of the trunk relay group without it having had access to the call recorder equipment.



  If the DB relay <I> a </I> has worked and has blocked or if the connections between terminals 21 and 22 have not been made, when the IVB relay operates again through the contacts <I> down, </I> kal and Ibb4, when the IBB relay is released it will, at contact kr6, cause the IIS researcher to advance outside the part of his bench giving access to the registrars-translators,

      and this device will undertake a search in the part of its bench giving access to the printer controllers, the test circuit is as follows: earth (kr7, alarm wire 21), wipers of the first part of bench H9, normally closed contacts 1b4 and K2, krl contact and YC resistor in parallel with YE resistor, kr2 contact, K relay windings in series, H88 test wipers.



  When a free printer controller, marked with a negative through a resistor, as in the case of a free translator recorder, is found, relay K operates to stop the forward movement, to operate the relays. <I> IDA </I> and KB and release the relay <I> KR. </I> When the relay <I> KA </I> works, at contacts kaâ and ka4, it switches the incoming positive and negative wires to the printer controller which is ready for reception of the code signals representing the calling number;

   the relay KB, while operating, prepares at its contacts kb5 and kb6 the circuit transmitting the duration of the conversation to the printer controller by means of the banks of the switches US and TS.



  The first information which must be received by the printer controller is the identity of the called subscriber, so that the junction between the originating office and the tandem office can be released as soon as possible, the transmission of this information is caused by the transmission of a 50 cycle alternating current pulse by the printer controller. If we look again at the circuit of the starting relay group of fig. 10, it can be seen that, when the calling subscriber hangs up his receiver, the earth which was brought from the primary code selector via the wire P is cut; the result is that the JA relay drops out.



  If the call requires, as just described, a recording, separate from a single or multiple unit count, during the search for a free printer controller at the tandem office, a negative will be brought from the winding of relay R of the group of interurban relays up to the positive wire of the junction, the relay DD having operated under the action of its right winding when the relay IB was de-energized. This negative is extended through the positive wire and operates the JR relay of the starting relay group @.

   When the JA relay of this group drops out, the JB relay remains blocked, through its jbl contact and the negative taken through a resistor, an earth is then brought through the ja2, jb2 contacts <I> and </I> sr7 up to wire P. The momentary disconnection of this wire from the earth during the time of the release of the JA relay provides the cut-off period necessary for the release of the intermediate switches and devices of the selection train. between the primary code selector and the starting relay group.

    



  When the trunk relay group finds an available controller, the negative is removed from the positive wire at contact ka4 of the trunk relay group and the JR relay drops out, it bypasses and releases the JB relay.



  A 50 cycle alternating current pulse is transmitted from the relay group of the printer controller put into service to the starting relay group, this pulse operates the S relay through to the capacitor <I> QC </I> and the windings of the transformer TR. When the relay S operates, at contact s2, it energizes the relay SR by means of the head springs, earthed, 1N1 of the regenerator, and it provides an auxiliary earth for its own power supply, at contact s1. When the SR relay operates, on contact sr1 it activates the relay again. <I> JR,

   </I> so that the short-circuit placed at the terminals of the relay JB is cut before this relay has had time to drop. At contact sr2, the circuit of relay S is made dependent on contact s1; on sri contact, the blocking circuit of the SR relay is established; on contact sr6, the MMR relay is energized under the action of its left-hand winding by means of the switch springs IMP4 of the regenerator, which are earthed.

   The MMR relay is blocked under the action of its right-hand winding via the earth, the mmrl and sr4 contacts, the switch contacts <I> l </I> tm of the regenerator emission electromagnet; finally, at contact sr7, an earth is kept connected to wire P regardless of the state of relays JA and JB.



  At the end of the sending of the signal in alternating current by the group of interurban relays, the relay S drops; therefore, the earth is brought via the head con- tacts 1N1 of the regenerator and the contacts s2, mmr2 and sa2 to energize the electromagnet Mil of the regenerator, the SA relay having operated when the MMR relay <I> a </I> been excited. The 1TM electromagnet, when functioning, opens the blocking circuit of the 11IMR relay at the ltm contact; when the MMR relay drops out, it opens the electromagnet excitation circuit at the mmr2 contact.



  When the electromagnet 1TM is de-energized, the emitter disc is released in the usual way and begins to rotate under the action of the energy accumulated in the spring of the regenerator.



  The transmitting disc, while rotating, transmits the number of the calling subscriber in the form of a code: i five units, as described previously, the distinction between the marking and spacing pulses being made by the transmitting a 50 period pulse for each space pulse and by transmitting a 50 period pulse as well as a 150 period pulse for each marking pulse.



  If it is assumed that a four digit number is to be transmitted, then a total of 20 pulses should be transmitted on the line and the 50 period frequency that is transmitted during each pulse operates a relay tuned to that frequency in the group of printer controller relay, which advances a step switch through twenty positions.

   When a marking pulse comprising 50 and 150 period pulses is transmitted, another relay operates and connects a ground to a contactor of the switch in question, which energizes a particular conservation relay in accordance with the position of the friction. - tor. Four groups of holding relays are provided in the printer controller relay group, each group comprising V, W, X, Y and Z relays by means of which the codes of five units can be translated into computer numeric numbers. naires.



  In order to return the required spacing and marking pulses constituting the., Ode, the regulator of the starting relay group is provided with two sets of impulse springs IMP4 and IMP5, the first being closed when the second is open and vice versa.



  When the emitter disc is released and begins to rotate, it closes the impulse springs IMP5; therefore the IJIP4 impulse springs open and release the SA relay which is ready to operate the MMR relay again. The MMR relay being in the rest position, a current source at the frequency of 50 and 150 periods combined and connected to the common wire 20 is connected, via the impulse springs IibIP5 to the transformer TR and the frequencies of 50 and 150 periods can elapse on the line to the tandem office printer controller relay group.

    The reception switch in this office moves from position 1 to position 2 and is connected to the conservation relay Y of the first group ready to receive the number of the calling subscriber, it being understood that the reception of these two frequencies at this initial point of operations has no effect on the number retention relays.



  At the end of the sending of the pulse, the springs IMP5 open and the springs IMP4 close to energize the MMR relay. If the reset pin 1RP in the transmission disc has not yet reached against a displaced stop pin; such as pin 1SP representative of the first marking pulse retained by the regenerator, the relay 3131R, when operating, is blocked under the action of a right-hand rolling sound and via the switch contacts <i> 1 </I> tm, grounded, of the electromagnet.

   When the IMP5 springs close for the second time and the 31MR relay is in the working position, a 50-period alternating current source, grounded, is connected to common wire 19 and connected through the transformer TR and the junction to the printer controller relay group, this spacing pulse advances the receive switch to position 2.



  The transmission of pulses at the frequency of 50 periods continues until the idle pin of the sender disc encounters a displaced stop pin. At this time, the SA relay circuit closes as follows:

   IRP rest pin, ground, and stop pin such as ISP, mmr6 contact, SA relay winding, sr5 contact; when the SA relay operates, it is blocked via the impulse springs IMP4 which are closed and the contact sa1. The ITM electromagnet is energized again and on contact <i> 1 </I> tm provo that the release of the MUR relay which, in turn, cuts off the power supply circuit of the ITM electromagnet. With the IMR relay in the normal position,

   the next code pulse to be sent on the line will be a marking pulse at the frequency of 50 and 150 periods; it causes the operation of a corresponding conservation relay in the relays group of the printer controller.



  If the next pin is not moved, then when the impulse springs IMP4 close at the end of the 50 and 150 cycle pulse, the MMR relay will have operated; the SA relay having been released during the opening period of the springs IMP4 when the springs IMP5 were closed; in this way, the information stored in code form in the regenerator of the outgoing relay group is sent in the same code to the printer controller of the tandem office.

      When all the signals stored in the regenerator have been retransmitted, the transmitter disc S engages with the receiver disc R; therefore, the 1N1 head contacts open and release the SR relay which overrides the guard polarity placed on the P wire.



  To ensure that the junction will not be put back into service before the organs of the tandem office are ready to be used for other calls, arrangements will be made for the blocking negative to be extended, by the '' intermediary of the positive wire, to the starting relay group, so as to maintain the relays <I> JR </I> and JB in working position and to maintain a protective earth on the P wire, when the SS relay drops out.



  As soon as a trunk becomes available for other calls, the blocking is removed on it at the tandem office and the relay <I> JR, </I> returning to idle, bypass relay JB to free the junction.



  In the event that communication is not established or recorded and that, consequently, information relating to it is not required, the JR relay does not remain powered in the working position via the wire. positive when relay JA drops, when the calling subscriber hangs up his receiver, so that relay JB will be short-circuited and released.

   On falling, the relay JB, on contact jb6, energizes the relay SR which, when it operates, causes the sending of the information stored in the regenerator, but these pulses are inoperative in this case, since the secondary of transformer TB is cut on contact jb3.



  Now returning again to the consideration of the functions of the trunk relay group of Figs. 11 and 12, it can be seen that when all the details of the calling number have been received by the printer controller relay group, a ground is given through the bank and the HSi wiper to energize the relay. <I> 10N. </I> When the relay <I> 10N </I> works, it is blocked by means of its lonl contact and the 2N1 head contacts of the regenerator which are earthed and at the lo-ra2 contact,

      it cuts the relay circuit <I> BA. </I> During the relay relaxation period <I> BA, </I> a cut was given in the guard of the incoming wire P, so as to allow the release of the first part of the switching train in the tandem office. This equipment, on returning to idle, removes the blocking given to the group of outgoing relays from the office of origin, so as to release the latter and make it available for other uses, as has already been described. .



  When operating, the relay <I> ION, </I> at con tact lon3, reconnect the guard polarity to the incoming wire P via the rest contact <I> prom; </I> on contact lora4, it closes the BR relay excitation circuit.



  When the BR relay operates, it is blocked by the intermediary of its 2-r1 contact and it closes the excitation circuit of the 2P relay. While operating, the 2P relay closes, on contact 2p2, the excitation circuit of the emitting electromagnet 2T111 of the regenerator; in touch with <I> 2p1, </I> it makes the operation of the relay BR dependent on the 2tm switch contacts of the transmitting electromagnet, so that when these contacts open, the relay BR drops out and cuts the supply circuit of the 'electro magnet.



  The 2T11 electromagnet, returning to idle, releases the emitting disc from the regenerator in the usual way and the latter, by rotating, controls two groups of impulse springs IMP6 and ITIP7 arranged in the same way as those of the starting release group.

   At the same time, the receiving equipment of the printer controller relay group has been made capable of receiving the code pulses representing the called number, these being emitted by the springs IMP6; we arrange for the spacing pulses to be transmitted by the wire <I> IN </I> to the printer controller and through contacts ka4 and rr3 and the same so that the marking pulses are transmitted on the negative wire <I> IN </I> through contacts ka3 and rr3. The first impulse will always be transmitted by the

  regenerator when the relay BR is in normal position, therefore, it will be sent from the impulse springs IJIP6 through the contacts r7-3 and ka3, from the negative wire <I> IN, </I> of the IIS2 slider and bench.



       While this impulse is being sent, the ZJIP7 springs open and release the 2P relay, so that when they close again at the end (sending, the BR relay operates.

   If no displaced pin, such as 2SP, is encountered by the sender disc reset pin 2RP, the next pulse will be sent to the positive wire. <I> IN, </I> while the relay <I> RB </I> is in the working position.

       Until a displaced spindle is encountered, spacing pulses will be sent to the print controller, through the positive IN wire, the wiper and the HS3 bank, as soon as a displaced spindle is encountered, the transmission is stopped by the reset pin 2RP which has butted against the stop pin? SP; the 2P relay excitation circuit closes as follows:

   contact 1U) 14, reset pin 2.RP, special pin such as 2SP, contact ri-2. The 2P relay, when operating, closes the excitation circuit of the 2T electromagnet: 11, which in turn cuts the circuit of the RR relay; the latter cuts the supply circuit of the 2TJ1 electromagnet.



  The emitter disc is released again and because the BR relay is in the normal position, the first pulse emitted will be a marking pulse consisting of a ground connected to the negative wire <I> IN. </I>



  While sending this pulse, the cut-off springs <i> 1 </I> MP7, on opening, causes: the release of the 2P relay, as before; at the end of sending the pulse, when these springs close again, the RB relay operates and spacing pulses consisting of a ground connected to the positive wire continue to be issued until Another misplaced pin is encountered, which pin indicates the presence of a marking pulse.



  In this way, the called number is transmitted from the trunk relay group to the printer controller.



  When the printer controller has received the called number, it prepares to receive the indication of the duration of the call, this being given by the trunk relay group.



  It should be noted that the TS1 and <I> T82, </I> U81. and U82 of the TS switches and <I> US, </I> are connected to five wipers marked HSI, 2, 3, 6 and 7, the benches being connected together in such a way, that in accordance with the positioning of the wipers, a group of five relays of conservation V, <I> W, X, Y, Z </I> of the printer controller, connected respectively to the HS1 wiper benches, <I> 2, 3, </I> 6 and 7 can receive the information concerning the duration of the call in the form of a code of five units.



  The tens indication is transmitted first through these five wires to a group of holding relays forming part of the printer controller; this is done by connecting in the printer controller an earth to the FIS5 wiper bank, so that this earth can be given through the contacts kb6 and 1bb7 to the wipers TSl and TS2 of the switch of the tens TS.



  If we assume, for example, that the duration of the communication is twenty seconds, the wipers TS1 and T82 will be in position 3. The wipers HS1 and HS3 will be connected to earth, which will operate the relays V and X of the controller. printer which correspond to the number 2, as has already been said in relation to the first description of sending a code of five units.



  After receiving the tens indication, a second group of conservation relays is connected to banks HS1, 2, 3, 6 and 7 and an earth is brought through the bank of the wiper HS4 and contacts kb5 and ba4 up to wipers US1 and US2. These wipers will be in position on the rest contact if the duration of the communication is twenty seconds;

   it follows that an earth is brought by the intermediary of the rubbers <I> H86 </I> and HS7 to operate the Y and Z units keep relays which give "0" as the units digit in the printer controller. The printer controller now has all the information required from the trunk relay group for the recording of the call, so it removes the negative through a resistance given by the test bench H8.

   Relay K drops and, in turn, releases the relays <I> KA </I> and KB. Relay B returns to standby when relay K is released and causes relay 1B and the other relays controlled by it to return to standby; when the KB relay is released, the search finder HS return circuit to the rest position closes.

   At the same time, the return circuits of the switches <I> US </I> and TS close, the first circuit borrowing the earth, the contacts ba6 and kb4, the. usnl head contacts of the USNI switch, the usm switch contacts of the USM solenoid and the negative.

   When this switch reaches the rest position, its return circuit is cut at the usnI contacts which, returning to rest, close the return circuit of the TSM switch. In this way, the trunk relay group is available for all further use.



  Consideration will now be given to the arrangements made for the automatic establishment of communications in a national network. To achieve this goal, a country can be divided into a number of zones, these preferably being divided taking into account the existing network of junctions. A subdivision is then made into groups, each group being in turn divided into a number of offices and / or networks.

   Each group can be made dependent on what may be called a "group center office", for all communications being established from one group to another, a zone center office being provided in each zone, each of these. centers having direct links with most other zone centers and, if possible, with group centers in other zones, when there is a sufficiently large community of interest between them.



  Under certain conditions, the automatic establishment of a communication between two subscribers of the national network can be carried out by sending digits which cause the selection of the required zone, of the group in this zone, and of the network or office in this group. . The following digits will direct the call to the called party.



  If we consider the case of the British telephone network, we know that the country is divided into 17 zones, each of them being subdivided into groups.



  For the purpose of establishing automatic communications in the national network, all recorded calls will have at least three prefix digits in addition to the ordinary number in the requested network, these digits being included from <B> 011 </B> to 099 and giving ninety different selections.

   In the case of a given calling office, it is not proposed that the number of digits sent be the same, whatever the situation of the calling office, but rather that the total number of digits to be sent is desired to be inversely proportional to the community of interest existing between the calling and called offices: for example, there is a large community of interest between Liverpool and Manchester and arrangements will be made for a smaller number of digits to be required to perform an intercommunication between subscribers in these regions than in the case of Liverpool and Newcastle, the community of interest between these two cities not being as great.

   In the case of the London region which has e1 recorder-translators; which has a large community of interest with the Home Counties, communications will be established between these two regions on the basis of call recording; For this purpose, forty prefixes, or 011 to 010, will be reserved in the indicator.



  The fifty remaining codes, that is to say 051 to 090, will be used to direct the call to the various zone centers of the country, each of the seventeen zones requiring one, two or three prefixes or codes, depending on the district. tances. The number of the subscriber called in the local office may be an ordinary number of four to seven digits in the case of districts without recorder-translators, or a seven-digit number consisting of the three digits or code letters and the four Numerical digits in a district with recorder-translators, the whole being preceded by one or more code digits, depending on the community of interest existing between the calling and called offices.



  For example, in the case of a call made by a subscriber in the London office with recorder-translators to a subscriber in the Birmingham network with recorder-translators, the digits 081 followed by the seven-digit number in the Birmingham network must be issued. When the digits 081 are sent to the office to which the calling subscriber is connected, the local translator recorder transmits discriminating digits to make the connection to a central or sub-central office in the London region where the connection ends. towards the central office of the Bir mingham area which functions as a tandem center.

   The number sent in full including the prefix 081 or, as a variant, the full number received in the local recorder-translator is then repeated to the tandem center where the call recorder is located and where the digits 81 will be translated, by the recorder-translator of the tan dem (the digit 0 having been received by the switch of the digit A), to direct the call to the requested zone center, in this case Birmingham.

   The other digits constituting the transmitted number are then transmitted to the center of the Birming ham zone, it being understood that for the transmission of the pulses on the junctions. a suitable circuit for transmitting the pulses at long distances by direct current or by voice frequency current will be used.



  A typical layout of the end junctions which can be applied to the center of the Birmingham area is shown in fig. 7; by referring to this, it can be seen that the ZIS arrival selector, when it is put into service under the conditions described above, will receive a train of pulses which will raise its wipers up to a level such as level 0.

   This level provides access to an ICS primary code selector, so that when the called seven digit number is transmitted from the originating tandem center, it is received by the RT recorder-translator to establish the connection as required. naked to the requested subscriber of the Bir mingham area with recorders-translators.



  As Birmingham is a zone center, it may be desirable to have access from London to an office of any of the other groups in the Birming ham zone; in this case, we can arrange for the London subscriber to have to send four prefix digits, instead of three, as said in the previous case of a call to the Birmingham office, since, in this example , the community of interest between the calling and called offices is not of such a high degree.



  In this type of communication, the initial numbers sent can be, for example, 082 or 033; in each case, they will be followed by a fourth digit which may be any one of the digits 1 to 8 by means of which the center of the desired group may be selected on a decimal basis.



       When issuing the initial digits 082, communication is directed to the incoming ZIS zone selector. The fourth digit and the following digits will be transmitted to the recorder-translator of the remote tandem office in the form of translated digits, in the particular case considered we will arrange for the fourth digit to be any of the digits from 1 to 8, so that one can have access from levels 1 to 8 of the ZIS selector to eight groups of junctions leading to different group centers, one of these being shown at the bottom of FIG. 7.



  When issuing the initial digits 083, it can be arranged that the ZIS selector is switched on from the tandem center and so that it rises vertically under the action of an additional discriminator digit up to at a level such as 9 which makes the connection with ZS2 secondary selectors. Any of the digits from 1 to 0 can be sent as the fourth digit in this case, this digit will allow the Z82 selector to select any one of the ten groups of junctions leading to centers of different groups.



  With the arrangements just described, the selection of any one of the eighteen group centers can be made and it will be appreciated that these arrangements can be changed on the spot to accommodate a larger number. or fewer group centers in a given area.



       When the selection of the desired group center is made, a group of GRS relays is put into service at this point and connected to a GRT group translator through a GRTH finder. The first digit or digits of the number are received at the center of the group and are routed to the group translator who transmits the necessary discriminator digits through selectors, such as GS1 and GS2, to establish the connection to the tandem office.

    The last digit or the last digits of the number which are not required by the group translator to carry out the translation are kept in the GRS relays group by a conservation and regeneration device; after the discrimination digits have been retransmitted, these retained digits are sent to complete the call setup.



  In the case of long-distance calls made by subscribers connected to networks without recorder-translators, one or more suitable prefix digits will be sent to give access to a central office of the group where there are recorder-translator devices, or channel discriminators, which will receive the digits remaining transmitted and which will direct the call to the so-called requested office, in the manner which has already been described. These group center offices will also be equipped with call recording equipment.



  We may find it interesting to lead to an arrival selector <I> GIS </I> communications entering a group center and coming from other group centers in the same area or from the neighboring network. Levels 2 to 0 of this selector can make connections in the closed numbering system of the group center, with level 1 terminating at the GRS relay group, so that in the case of a communication passing through the center of the group and intended for offices outside the closed numbering system, the GRT translator is put into service.

    In the case of calls established in the closed numbering system of the group center, where the community of interest between the calling and called offices seems likely to be high, fewer different digits should be sent than in the case of calls intended for at offices outside the closed numbering system of the group center where the community of interest is less.



  Instead of dividing the country into zones, one can alternatively divide it into regions which will in general be larger than the zones and which will each have one or more regional centers, depending on the size of the region and the telephone density of that region. -this. These tandem or regional centers will be equipped with call recording devices and regional recorder-translators, they will have access to other regional centers through which all long-distance calls will be routed.



  In the case of such communications, it can be arranged so that a subscriber must first send certain initial digits indicative of the requested region which will connect him to the local regional center where to be carried out,) the search for a recorder- free regional translator.

   When this device is found, the subscriber will receive a second invitation tone to be transmitted and he will then have to continue sending the rest of the number to the regional recorder-translator who, from then on, will make the connection either directly or by through other recorder-translators in the remote region.

    In this case, it may be deemed desirable, for information purposes, to keep the number of initial digits constant, and particularly if the various junctions can be given distinctive designations corresponding to the first three letters of the name of the region considered.

 

Claims (1)

REVE-NDICATION Telephone installation comprising a plurality of networks or zones, each network or zone having its own closed numbering system and having a distinctive designation, # @ araeterized by the arrangement, in a selected central or sub-central office ( R) of the calling area, route determination means <I> (RD) </I> which receive the designation characteristic of the, called area and in response to this characteristic determine the route by which communication is to be established, and call-related information storage (TLRS) tnovens which also receive the naming characteristic of the called area, as well as other particularities of the communication and which, after the end of the communication established by the key determining means, the path to follow, cause the stored information to be transmitted to a recorder (.P). SUB-CLAIMS: 1. Telephone installation according to claim, in which one of the networks is a network without recorder-translator, characterized by separate junction lines (10 and 11) between a satellite office (A) and a central or sub-central office (B) of the network without a recorder-translator, one of the junction lines (10) being put into service for local communications of the network without a recorder-translator and having no access to the means of determining the path forward <I> (BD), </I> while the other line (11 ) is put into service for communications outside the network without a translator-recorder to other zones, with access to the means of determining the path to follow <B> (BD), </B> and by means of Discrimi nation (DSR) at the satellite office and who, in response to a command exerted by a calling subscriber before the transmission of the designation characteristic of the called area, cause the selection of a trunk line which has access to the means for determining the route to follow <B> (BD ). </B> 2. Telephone installation according to sub-claim 1, in which the trunk lines used for inter-zone communications can also be used for calls to an operator, characterized by discrimination means (DRS) arranged at the central or sub-central office (B ) and which are actuated by the discrimination means (DRS) placed at the satellite office (A) to determine whether the communication should be directed to the lane determining means <B> (BD) </B> or to an operator position (0). 3. Telephone installation according to sub-claim 1, wherein the junction lines used for inter-zone communications are also used for prepaid stations requiring the intervention of an operator, characterized in that discrimination means (DSR) located at the central or sub-central office (B), in response to a command exerted by the discrimination means (DSR) at the satellite office (A), are arranged to effect the transmission of a signal to an operator position to inform the latter that the call has been made by a prepaid station. 4. Telephone installation according to the claim, comprising a network with translator-recorders having access to a plurality of networks both with translators-recorders and without translators-recorders, characterized by selection means <I> (F2 , F6) </I> of a recording position arranged in a translator-recorder (LRT, fig. 8 and 9) of the office of origin, these means, in response to predefined digits sent by the calling subscriber, causing the establishment of the communication to the central or sub-central office where the registration position (TLRS) is located, which gives access (by HS) to the translator = recorder (TRT) located at this position, this translator-recorder receiving the called number of the translator-recorder at the originating office and directing the call to the remote network. 5. Telephone installation according to sub-claim 4, characterized in that the translator-recorder (fig. 8 and 9) of the office of origin is seized by a connector responding to the first digit transmitted <I> (LADS, </ I > fig. 5 and 6), in response to the transmission of a predetermined digit by the calling subscriber, and in that this translator-recorder is separate and distinct from the other translator-recorders (LRT) entered by the connector responding to the first digit sent <I> (LADS) </I> in response to other digits sent by the calling subscriber for the purpose of establishing communications in the same translator network- recorders as the calling subscriber. 6. Telephone installation according to sub-claim 4, characterized in that the translator-recorder (fig. 8 and 9) of the home office is provided with means for selecting an operator position (FI, F5), a selector (F4) also being provided which deter mine, according to a figure transmitted by the calling subscriber, which selection means must be actuated. 7. Telephone installation according to subclaim 4, characterized in that the translator-recorder (fig. 8 and 9) of the original office is provided with a device for storing pulses (RN) by which all the digits necessary to direct the call to the called subscriber are stored until the call has been established with the registration position (TLRS, <I> fi-. </I> 11 and 12). 8. Telephone installation according to sub-claim 4, characterized in that the translator-recorder associated with the recording position of the call is provided with a pulse reserve device (2RM) by which all the necessary digits to direct the call to the called subscriber are put on hold until the call has been established to a central or sub-central office in the remote area. 9. Telephone installation according to claim, characterized in that a zone arrival selector (ZIS) provides access to a translator-recorder (RT) to establish communications in the zone in which it is located and to a translator-recorder (GRT) located at the central office of a group of offices or networks each of which has its own closed numbering system through which communications are established to the desired office or network, and whereby the connectors in the desired office or network are actuated according to the local number of the called subscriber.