BE438878A - - Google Patents

Description

       

    <Desc / Clms Page number 1>
 
 EMI1.1
 

  <Desc / Clms Page number 2>

 



    Improvements to telephone systems.



   The present invention relates to improvements relating to or made to devices intended for establishing communications in telephone systems, it relates more particularly to improved devices relating to communications which must be recorded for charging purposes. , that is to say, to. communications which fall outside those for which the charge can be determined by operating a meter, specific to a calling subscriber, one or more times, which makes it possible to charge such

  <Desc / Clms Page number 3>

 communications on the basis of / duration as well as distance.



   In general, local calls within an area comprising several central offices and having closed numbering are charged by operating the subscriber's meter and in addition, in neighboring networks charges are established from the base. same way although these networks are not part of the zone having the same numbering system as the zone from which the call originates.



   The main feature of the present invention resides in the fact that the recording of the call takes place in the office of the area where the path to be followed by the communication is determined, so that the number of the called subscriber in the closed numbering system associated with the destination office is transmitted in the entire area of origin directly to the destination area after establishing a connection with an office in the destination area, registration being made in the office of the area of origin from which the number was transmitted.



   The invention can be applied to a wide variety of cases, for example, the currently demarcated zones can be classified into two broad categories, in the first the closed numbering system has a decimal base and each of the subscribers of this zone has received a number of several digits, for example, 4,5 or 6 digits, each of them representing the setting of switches for the establishment of a connection having a direct numerical relation with the number considered;

   in the second, that the numbering system is based on the fact / the first digits represent the name of an office, the other digits representing the number of the subscriber connected to this office. '' Frequently, the numbers designating the office are replaced

  <Desc / Clms Page number 4>

 by letters, they are translated by recorder-translators into numbers determining the route to be followed to transfer the call from the office of origin to the office of destination, the setting of the switches for the routing of this call having no numerical relation with the proper value assigned to the digits designating the office in question.

   On the other hand, the numbers added to the letters control the positioning of the switches in the office of destination, this being required to establish communication to a given subscriber.



   In this specification, the areas of the first category of the numbering system will be called "networks without recorder-translators" and those of the second category "networks with recorder-translators".



   The invention applies to the establishment of communications between a network without recorder-translators and another network without recorder-translators, between a network with recorder-translators and a network without recorder-translators, between a network without recorders-translators. and a network with recorders-translators, between a network with recorders-translators and another network with recorders-translators and between a-network with recorders-translators and offices in its immediate vicinity which may be at such a distance that one wishes to be able to make use of the recording 'but which other than that can be regarded as part of the network with recorder-translators.



   It will be noted that generally speaking, networks with recorder-translators are of a much greater extent than networks without recorders-translators.



   At present in networks without

  <Desc / Clms Page number 5>

 recorders-translators where 5 or 6 digit numbers are used the counting is usually done on the basis of one unit per conversation, i.e. for local communications the counter only works only once, long-distance calls being routed through an operator, for example, after the digit "o" has been sent.



   In other cases a number of neighboring networks without recorders-translators are combined into a network of reasonable size, communications between the various networks being established by sending the desired number in the destination network preceded by one or more digits. designating this network. As each network without recorder-translators usually has its own closed numbering system and in order to keep the number of digits below a certain minimum, generally no more than 7, we use, in the case of 'a call from a network with recorder-translators to a combined network, a recorder-translator or channel discriminator associated with the outgoing junctions of each network, in order to direct the call to the desired network.



   Such networks can be designed to be operated based on the registration of several units per conversation. The number of times that a subscriber counter operates, after the establishment of a call, being determined by the channel discriminator in accordance with the particular number transmitted. For communications to the outside of combined networks, the connection with an operator is usually obtained by sending the number "o"
Third, in the case of sectors, recorder-translators will be used for all calls within it, whether the calling subscriber is

  <Desc / Clms Page number 6>

 connected to the urban office or not, in this case the counting by multiple of units can be applied directly.

   The number of times a subscriber's counter is to run for a particular call can, for example, be determined by the level at which the first or second selector switch set by the recorder stops. translator.



   For calls outside such areas, the letters of the codes "TOL" or "TRU" can be sent, which has the effect of connecting the caller to a manual table of a suburban office or a long distance office respectively. .



   Alternatively, the connection to an operator can be established by simply issuing the digit "O".



   One of the applications of the invention concerns the extension of networks in which use is made of call recording devices or automatic tariff devices on a scale such that the subscriber can still transmit directly up to distances. which until now required the intervention of an operator to establish the charge based on the distance separating the subscribers in conversation and the duration of the call.

   In this regard, it may be recalled that time-based taxation can be effected by repeatedly recording the basic unit charge, but in general it is considered preferable to limit the multiple charge to a value of l The order of four unit charges or even less, since higher charges, which cannot be controlled, should preferably not be recorded at the subscriber's meter.



   The invention also applies to the case of the constitution of a national telephone network which allows any subscriber to enter into communication automatically with any other subscriber in the same country, it being understood that in this case it is necessary. case to minimize

  <Desc / Clms Page number 7>

 modifications to be foreseen in the existing networks and in the groups of suburban and interurban junctions at the same time to ensure that the additional equipment will be reduced to a minimum as well.



   The invention can be applied particularly to existing telephony systems of the type which has been described, it is however not limited to this particular case but it can be adapted to any new telephony system.



   According to a complementary characteristic of the invention, the calls, sent in networks without recorder-translators and comprising main and satellite offices, to other offices or networks for which the recording of the call is required, , are directed under the control of the subscriber to a main office of the calling network where the appropriate means are provided to determine the route to be followed in order to route the call to the office or the remote network requested, automatic recording communication being done in this main office.



   The characteristic of the invention which has just been described above makes it possible to provide the means making it possible to determine the route to be followed and to record the call at the central office itself of a network, there may however be certain cases in which all the calls made in a network without recorder-translators and for which registration is required, can pass through a neighboring network with recorder-translators and according to another characteristic of the invention a single group of junctions is provided between the central office (which may be a main office) of a network without recorder-translators and a central or sub-central office of a network with recorder-translators;

   as a free junction among these is selected automatically under the control of the subscriber, it is not necessary to provide specific means to

  <Desc / Clms Page number 8>

 determine the way forward at the central office of the network without recorder-translators; in addition: according to this characteristic of the invention, the means suitable for determining the path to follow will be provided at the central or sub-central office of the network with recorder-translators, the automatic call recording devices being provided at the office. central office of the network without recorder-translators, the distinguishing digits of the requested office being transmitted, under the control of the subscriber, to the devices, determining the route to follow, from the central or sub-central office of the network with recorder-translators .



   According to another characteristic of the invention, in a telephony system or in a similar system comprising a network with recorder-translators having access to several other networks, which may be networks with recorder-translators or networks without recorders. -translators, or networks of both types, the recorder-translator is designed so that it can be put into service at the moment when an inter-network call is made so as to direct the call to a central or sub-central office of the network with recorder-translators, a second recorder-translator being designed in such a way that it is put into service in this central or sub-central office to direct the call to the desired network, the call recording apparatus being so designed,

   whether they are put into service at said central or sub-central office to record the call.



   According to another characteristic of the invention, which is particularly applicable in networks with recorder-translators, a recorder-translator is used to direct the call either to an opera position.

  <Desc / Clms Page number 9>

 or to a position for recording inter-network calls, depending on the value of the digit received, after the recorder-translator has been put into service.



   This characteristic of the invention makes it possible to use existing installations in which the calls intended for an operator are sent by the subscriber by sending the digit "o", in this case a call will be directed to an operator, either by sending the digits "00", or by sending the digit "0" and not sending any more digit afterwards, while if another digit followed the first, different from "o". the call will then be directed to a call recording position.



   According to another characteristic 'of the invention, it is possible to provide for the extension of a network with recorders-translators by adding central offices or networks, which implies the possibility of establishing communications between the subscribers of the extended network, these being charged by the recording of calls, finally, according to another characteristic of the invention a recorder-translator can be put into service at the office or at the satellite from which the call is made, a second recorder-translator being put into service at the central or sub-central office which gives access to the requested office, recording devices being put into service in a central or sub-central office to allow the recording of the communication.



   Another characteristic of the invention relates to the special arrangements which allow the establishment of communications in a very large territory or even in an entire country, according to this characteristic, the network covering the territory is divided into a number of zones, each of them having one or more central zone offices, each zone being divided into

  <Desc / Clms Page number 10>

 groups, the groups in turn each having one or more group center offices, each group being subdivided into a certain number of central offices or networks, each of these central offices or networks having its own closed numbering.

   According to this characteristic of the invention, in such a network, the means provided for designating the route to be followed and by which the digits which control the routing are determined for the establishment of a call coming from a group or one zone and intended for another group or another zone, as well as the means provided for recording particulars of the call in question, are located at the central office of the group or at the central office of the zone. 'where the call comes from.



   The following provisions correspond to secondary characteristics of the invention which, although they are protected by pending applications, constitute a particular application of the characteristics of the invention.



   For any recording of a call, it is necessary to identify the number of the calling line and according to a secondary characteristic of the invention the identity of the calling line is established and kept at the calling office when the call is sent. 'call on the trunk, the identification which has been retained as well as that of the calling office then being transmitted to the registration office at the end of the call.



   According to another secondary characteristic of the invention, mechanical pulse generators are provided for the conservation of the digits sent by a subscriber until the appropriate organs are brought into a position which makes them suitable for receiving them.



   According to another secondary characteristic of the invention, the information to be recorded is kept

  <Desc / Clms Page number 11>

 until the end of the communication, it is then transferred to a recording or printing device where other information is added to it, the whole being transferred in a rapid manner to the printer and the recorder so that only a small number of printers and recorders need to be provided for a large number of recording positions.



   Another feature of the invention, which is particularly advantageous for the rapid transfer of a number through the connection by means of a code and for its conservation in an economical manner until the information is required, relates to a pulse regenerator which operates under the action of two groups of pulses, the pulses of one group having a definite time relation to the pulses of the other group, and in which both Groups of pulses are retransmitted, in principle, in the same form as that in which they were received.

   For convenience, the pulse regenerator is constructed as described in patent 415894 and according to the invention a part is moved under the action of a receiving electromagnet to a position determined by a group of 'pulses, pins being moved during this movement by the action of a second group of pulses acting on a marking electromagnet, this second group of pulses having a definite time relation with respect to the first group , a pulse generator controlled by this action functioning, when it is released, and generating pulses corresponding in number to those of the first group and to the amplitude of the movement of the part in question,

   another pulse generator being provided which operates when each displaced pin is reached so as to generate corresponding pulses

  <Desc / Clms Page number 12>

 dant to the second group.



   This characteristic of the invention and others will be better understood from the following description of the application which is given by way of example and for which reference will be made to the accompanying drawings.



   Figure 1 shows the arrangement of two networks without recorder-translators which can be two networks taken from a number of identical networks in which, for inter-network calls, a simplified form of recorder-translator is used which will be referred to as the pathway discriminator and in which the distance and time charging will be carried out by means of automatic call recording devices.



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



   Figure 3 shows a variant of 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 an office. principal being obtained by issuing the digits "oo".



   Figure 4 shows the layout of a network with recorder-translators made up of a number of tandem or sub-central offices where the call recording devices that are necessary for certain types of established communications will be placed. within the sector, either to offices or networks outside the sector in question.



   Figure 5 shows the junction diagram in the case of routing a call from an office in the area with recorders-translators and terminating

  <Desc / Clms Page number 13>

 to an office or network, located outside the area, via a sub-central office.



   Figure 6 shows the arrangements applied in local and sub-central offices with recorder-translators in which different categories of traffic, requiring the identification of the calling subscriber, are combined into a common group in a central office or in a central point.



   Figure 7 shows the arrangements for the automatic establishment and recording of calls in the case of a national network, it shows typical arrangements for the distribution of incoming calls in a central area office and also in a group office in the area.



   Figures 8 to 12 show how some new elements are combined in the junction diagrams discussed above.



   Among these figures, figures 8 and 9 arranged side by side show the circuits of a simplified level 0 recorder-translator. Figure 10 shows the circuits of a group of starting relays which makes it possible to keep the identification of the line. appellant; Figures 11 and 12 placed side by side show the circuit of a group of interurban relays.



   These parts of apparatus are used in districts with recorders-translators of the type shown in figures 4 and 5 but it can be assumed that the circuits of equivalent apparatus, intended for other networks, can be designed on an identical basis. .



   To carry out the identification of the calling subscriber, the identification devices and the type of call retention / described in the request can be used.

  <Desc / Clms Page number 14>

 patent 339869; for the application of the invention one can use the devices and circuits described in general in patent 434799.



   We will now refer to Figure 1 and taking into account what the intercommunications between the two networks shown and between any one of these networks and other networks which are not shown, should have been, until day, established through the manual positions of the main offices B and C, the arrangements made so that such communications can be established / 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; we will first deal with the establishment of calls taken by subscribers of offices A and B, for this description we will refer to the junction diagrams in figure 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 this moment, for example 8, followed by one or more prefix digits accompanying the call number in the requested network. The sending of the first digit 8 by the 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 interurban relays which activates translator devices. and recorded

  <Desc / Clms Page number 15>

 call trors; 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 high junctions. yield.



   When the subscriber picks up his receiver, he is connected, via the LF line finder, to an associated DSR discriminator repeater selector. to the latter, these switches are connected to an arrival selector ISR at the main office, via the us searcher and the ordinary junction 10, in the well known manner.



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

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

   

  <Desc / Clms Page number 16>

 figure
In the case where the first / issued is 0, the ordinary trunk 10 is released and the call is routed, through the high-performance trunk 11, to the manual table in the main office, a signal of discrimination. - proper tion being sent from the starting relay group
ORS from the satellite office to the DRS discrimination relay group in the main office to direct communication to jack 0 of the manual table in the main office,
In the event that the subscriber uses a prepaid station, a different signal is sent to the DRS relay group to direct the communication to a special CB 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 trunk 10 is released as before and a high-performance trunk 11 is put into service at level 8 of the DSR, a distinctive signal being transmitted from the ORS outgoing relay group to direct the communication, to the DRS relay group, to the TLRS interurban relay group.

   Subscribers using prepaid sets and sending this cipher, when they are not authorized to automatically obtain such communications, are prevented from carrying out such a maneuver, either by sending a suitable signal sent of the ORS relay group and which, through the DRS relay group, causes the communication to be transferred to the special OB jacks of the manual table in the main office, either by the fact that there is no possible access to the ORS relay group from level 8 of the special group of DSR switches provided for such pastes.



   When the TLRS relay group is put into service, it gives access to an OGS starting selector, the searcher HS

  <Desc / Clms Page number 17>

 connecting to a free RD channel discriminator. Before considering the question 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 discriminator digits, to the incoming switch of the desired network, by the intermediary of a group of trunk relays, the originating switch and subsequent switches.

   The interurban relay group will be provided with a device for storing and regenerating pulses, for example, of the electromechanical type described in patent no. 415894 this device will be used to store the rest of the digits emitted, during the transmission. - sion of the translated figures coming from the channel discriminator.



   When all the discriminating digits have been returned, the TLRS relay group pulse storage and regeneration apparatus returns the retained digits, in the form in which it received them, so as to complete the connection to the called subscriber. With regard to the question of recording such calls, we know that the minimum information required to enable them to be charged at the caller's expense consists of indicating the calling number and the number. called and, if the calls are charged for the duration, the time taken by the call as well as the time and date if necessary,
For the identification of the calling number, it should be noted that the establishment of an inter-network communication results in the association of the outgoing ORS relay group of office A,

   through the RSE finder to a conservation control SC relay group, which in turn connects / connects to a conservation control IC relay group.

  <Desc / Clms Page number 18>

 identification, this being done during the establishment of the connection or when the called subscriber answers or during the conversation or even at the end of the latter, depending on what is considered preferable. When the relay group IC operates it activates an identification switch SS which works in the manner described in patent application 339869, which causes the identification of the calling subscriber which is kept in the relay group. starting DRS, the conservation being carried out as described, for example, in patent application 339869.

   As regards the retention of the calling number at the office of origin, until it is necessary to transmit it to the office where the call recording devices are provided, it can be foreseen that if this operation is carried out by means of conservation relay and a rotary send switch, as described in patent application 338869, it will not be necessary to provide the SC relay group or the RSF seeker, since the calling number can be transmitted directly to the ORS relay group.

   However, an electromechanical device for conservation and regeneration can be made use of in the ORS relay group and in this case it may be preferable to use a common control group SC and an RSF finder as shown in figure 1, from such that the signals characteristic of the identity of the calling subscriber can be received first, either by relays or by a stepping switch, in the common relay group SC. These relays or this stepping switch convert the received signals into suitable markings for positioning the ORS relay group regenerator in such a way that the number can be transmitted later in code form to the remote office.

  <Desc / Clms Page number 19>

 



   With regard to the called number, the digits sent to the TLRS long distance relay group are kept, for example, by relays and, at the end of the conversation, the HP searcher who, it should be noted, has his bench divided so that it can have successive access to the channel discriminators and to the call recording devices, connects to a pcrs recording or / printing controller to which the number of the calling subscriber will be transmitted by the outgoing relay group of office A; junction 11 will be released, after which the number of the called subscriber will be transmitted to this device as well as the duration of the call that will have been recorded by suitable devices from the interurban relay group.

   The date and time will also be given by common equipment, such as DTU, and the controller will direct the information it has received to the ticket printer or punch P. The total charge for the call can be set manually. or by suitable calculating machines and it is proposed that if it is desirable to employ means determining the royalty these should be included in the control devices of the printer or registrar, the royalty being determined at the end of the conversation.



   The general arrangement of the printer or recording devices may, for convenience, be of the type described in patent application 334799 modified so that it meets the conditions described above, the recorder or the printer itself being such that it only comes into operation when the information is protected for immediate printing or recording.



   The described channel discriminator differs from normal recorder-translators, such as those which are

  <Desc / Clms Page number 20>

 used in areas with more than one office, in that it is only required to receive the first digits of the number sent and, under the action of these, to direct the call to the office or network required then that the recorder-translator is designed to receive a full number and under the action of the latter to direct the call directly to the requested subscriber.

   If, therefore, the channel discriminator 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 for storing the called number until this information is required for long distance registration and it will not be necessary to provide retention relays to perform this function in the long distance relay group.



   With regard to the calls made by subscribers of the main office, it can be seen that they have access to the first digital selector SR by, through a junction, such as 13, and that the establishment of communications which require a recording is made as it has already been described.



   Although in the arrangement described the calls to the manual table and the inter-network calls are routed through a trunk group and the calls to the subscribers of the closed numbering system are routed through a trunk group. For another group of trunks, only one group of trunks may be provided to the main office to serve calls of all categories, with discrimination signals being used to effect the routing of the call to the main office.



   Discriminator selectors at satellite offices could be replaced by private selectors.

  <Desc / Clms Page number 21>

 ordinary mayors who when put into service have access to common discrimination equipment, through a searcher, this discrimination equipment being used to determine whether the call should be counted or charged through an automatic call recording device and consequently causing the communication to be routed to the main office. Discrimination equipment can be of the type described in Patent No. 420914.



   The invention is not limited to the simple example which is shown, since each network having its own closed numbering system can be associated with a certain number of networks each having their own numbering system. If one considers that it is preferable to be able to print a ticket in the event of a call from an office, part of a closed numbering system, to a dependent network, this can be done immediately in the manner that has been described already and calls of this species will have a common prefix, such as the number 8.



   As an extended application of this system we can consider the case of a certain number of counting districts with repeated units comprising several networks, working on the basis of a multiplied unit charge in the case of inter-network calls, the whole can be connected automatically to the call recording base. In such a case, the recorded inter-network calls are routed through the central office of each zone, where the call recording devices are installed, and it may be that in special cases communications between offices in neighboring areas, but which are only separated from each other by a distance less than that for which the unit charge is provided for,

  <Desc / Clms Page number 22>

 will be taxed on the basis of the call recording.



  Subscribers using prepaid sets can only establish unit charge connections of this kind through a manual table.



   In the event that there is no first digit available to be used in the case of inter-network calls, it is possible to arrange for calls to the manual table in the main office to be obtained by sending the digits "00". , calls requiring recording requiring the sending of a group of two digits from 01 to 09.



   Figure 3 shows typical junction arrangements at satellite office% and main office B where level 0 is used to access long distance offices. It can be seen that the apparatuses of the office a have been established according to the principles already described in relation to FIG. 2, a discriminating repeater selector being provided in this office and having access to a high efficiency junction 11, through the intermediary of a group of ORS start relays.



   If the first digit is "0" we will have access to a group of DRS discrimination relays of office B and in the case of a call made by an ordinary subscriber if the latter neglects to send other figures, within a fixed period of time, 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 long distance relay group, through a finder and this relay group receives the second digit sent.

   If this figure is "0", which indicates that the manual table is requested, a signal will be sent by the TLRS relay group to the DRS relay group to direct communication to the manual table, but if the second

  <Desc / Clms Page number 23>

 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 figure 2. The recording of the call is, therefore, carried out. in the manner which has been described above.



   In the case of calls originating from subscribers of the main office, if the figure "0" is sent as the first figure, we will have access, via 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 recording of the call.



   Long distance calls originating from the manual table are established through jack 0 / G which gives access to the long distance relay group, through a searcher and in the usual way; 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 is not obliged to stop sending digits until a group of interurban relays is found, a device for preserving and regenerating pulses can be inserted in any intermediate stage. . Since only the first digits of a number are usually required by the lane discriminator, the retention and regeneration device may be arranged so that it immediately retransmits only those digits which are required by this discriminator. The remaining digits will be held until all of the discrimination digits have been returned by the channel discriminator after which they can be retransmitted to complete the call setup.

  <Desc / Clms Page number 24>

 



   In the case where the DSR of the satellite office is replaced by an ordinary selector having access to a common discrimination device, as was 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 storage and regeneration device.



   Districts to which the invention can be applied may include networks having dependent networks and / or offices which are attached and it is often normal, in the case of calls made by dependent offices, to issue a single digit. - prefix to reach the main office. In such a case, if a communication requiring registration is requested, the number of digits sent must include the prefix that allows the main office to be reached, the digits required to direct the communication through the channel discriminator as well as the number of the subscriber called in the office to which he is connected.

   With the intention of reducing the number of digits to be transmitted, certain equipment may be provided in the various dependent offices, this equipment, in the event that one or more digits are sent indicating that registration is necessary, carry out a specific translation. to direct the call to common devices, channel discriminators and / or call recorders, at the main office, after which several or all of the digits originally sent are transmitted together with the remainder of the digits in the form in which they were received.



   The arrangement described in relation to fig. 2 assumes that the TLRS interurban relay group has access to the track discriminating devices as well as to the devices.

  <Desc / Clms Page number 25>

 call recorders, in the same way as that shown in figure 2, but in the case of communications intended for a network with recorder-translators or passing through it these communications may in fact be the only ones for which recording should be provided, a simple group of direct trunks can link a main office, such as B, to a central or sub-central office which is in a particular situation which allows it to receive calls from a network without recorders- translators.



  In such a case it is not necessary to provide the central office of the recorder-translator network with special means determining the path to be followed, this being already determined when a junction of the species is selected, it is therefore not necessary provide that the equipment giving access to the recording devices, so that the equipment provided for in figure 2 can be simplified to such a point that, in the central or sub-central office of the network with recorder-translators , the commissioning of a trunk in the network with recorder-translators triggers the commissioning of the equipment by which the digits representing the office or the zone and the number of the requested subscriber can be translated. .

   with a view to extending the multiple office areas of the type with recorder-translators so that they include networks or offices located outside their boundaries while allowing for the charging of communications established between,, or on the basis a recording of calls, or on the basis of the counting of the multiple of a unit charge by the counter in accordance with each particular case, two methods can be considered which can be applied

  <Desc / Clms Page number 26>

 quées in the case of the extension of existing networks in preference to others.



   According to one of these methods, the codes which cannot be used in the numbering system of a sector with recorder-translators are used for the establishment of communications to the districts located outside the limits of the sector in question.



  It should be understood that most of these codes cannot be combined to represent the first letters of the name of an office but they can be used either as numerical prefixes or, alternatively, on the basis of a combination of numbers and letters if proven to be preferable from the subscriber's point of view.



   In another method, account is taken of the fact that currently the emission of the digit "o" in a district with recorder-translators causes the commissioning of a recorder-translator which is also commissioned when another digit or d 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 "o" is emitted. 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 "o" followed by 'another additional digit as required and the full number of the subscriber called in the requested office.



   If the first digit transmitted is "0" and it is not followed by another * digit within a short space of time, for example three seconds, the call will be directed to a manual table by the intermediary of

  <Desc / Clms Page number 27>

 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 emission of these two digits being the new method to be used for call an operator.



   If two of the digits 01 to 09 are sent as the first digits, we 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 sent to him via the first group selector which will be put into operation.



   Each office will therefore be provided with a single group of recorder-translators for level 0 which provide access to the means for directing long-distance traffic, whether it is handled on a fully automatic basis or through the intermediary of 'a manual table. These recorder-translators in turn will be arranged so as to provide access to call recording devices and / or recorder-translators grouped together in a central office in the area.



   A description of the first system will be given first, for this one will refer to FIG. 4 giving the plan of a district with recorders-translators. Four of the offices, represented by the letters A through D, in the existing area as defined by the dotted line, are assumed to act as sub-central offices. Calls intended for networks or offices outside this zone, such as offices E, will be routed through one or more sub-central offices, where there will be

  <Desc / Clms Page number 28>

 planned call recording devices in addition to recorders-translators.



   It should be understood that some offices in the area with recorders-translators, located on the edge of it, can be operated on the basis of a single or multiple count for relations with certain offices located outside this area, so that calls coming from other offices within the zone and destined for the same office outside this zone will be handled on the basis of the recording, In addition it may be desirable to apply the recording for certain communications established within the area, for example, when such communications are to be established from one end of the area to the other.



   If we now consider the case of a call sent to office F to a subscriber connected to office E, we can assume, by way of example, that the number of the requested subscriber is 746.9762, the number 746 being a code / previously used in the area with recorder-translators.



   We will now refer to the junction diagram of fig. 5. When a calling subscriber picks up his receiver he is connected, through the .US selector, to his local office ICS primary code selector which connects in the well known manner and through the LADH finder to a LADS switch free, called digit switch. Due to the transmission of the first digit, 7, one of the local recorder-translators
LRT of level 7 group is activated and receives the other digits sent. The second and third digits emitted, i.e. 46 are then translated, for example into
985, so as to direct the call, via offices such as D and G, to the sub-central office or tandem office B

  <Desc / Clms Page number 29>

 which has access to office E located outside the limits of the zone.

   The digits discriminating the route to be followed are then followed by the number sent in full i.e. 746.9762 which is required at office B in order to be able to direct the call to the desired network or office and also for the needs of the call recording. The transmission of digits 985 determining the route to follow will give access, via the TISR arrival selector of this exchange, to a group of interurban relays, such as TLRS, which connects to a free TADS switch, called the digit A switch, through the THS researcher, the banks of the latter being divided so as to give access successively to the switches of the figure. and call recording devices as required.



   During the search by the THS switch a signal will be sent to keep the local office recorder-translator in service and when a free TADS switch has been found the local LRT recorder-translator will start to retransmit the full number. that was issued.



   Recorder-translators, such as TRT, put into service at the tandem office can be taken from a special group performing translations that allow calls to be directed to offices outside the zone boundaries and / or to networks served by the tandem office, these networks may include one or more networks with recorder-translators. As before the digit 7 will be received by the switch of digit A and the following digits will be received by the group of level 7 of TRT recorders-translators.

   On reception of the two digits 4 and 6, a translation will be carried out to direct the call, via the TSR selector, to the office or the requested network, after which the numeric selection digits 9762

  <Desc / Clms Page number 30>

 will be transmitted to obtain communication with the called subscriber of this office or network. The complete number of the called subscriber is stored in a long distance relay group; at the end of the conversation, the call is recorded in the manner which has already been described in relation to figures 2 and 3, the identification of the calling line being carried out at the calling office at the most opportune while establishing the commu. nication and identity being kept by this office.



   It may be that communications intended for office E can be established on the basis of a single count, or a multiple of the charging unit because the calling and called offices happen to be very close together, in such a case the calls to office E will be disposed of on the basis of an ordinary single or multiple count when they are made by subscribers of office B and probably by those located near this office, while calls to office E coming from other offices in the area with recorders-translators will be sold on the basis of the recording of calls.

   Under these conditions, the same group of recorder-translators at tandem office B will be used for all categories of calls since the existing recorder-translators will have already been provided to direct calls to the office located outside the limits of the zone. .



   In the case of calls made from office H, for example, to office E, it may be that the six translations normally available in the recorders-translators of office H are sufficient to allow the communication to be routed to the office. E and also to repeat the 3-digit code to tandem office B. In this case there will therefore be no need to

  <Desc / Clms Page number 31>

 activating a recorder-translator at the tandem office and the long distance relay group of this office, if the recording of the call is required, will simply keep the called number until the end of the conversation.



   It should be noted that where existing recorder-translators cannot receive more than four digits of numeric selection in addition to the letters and / or code digits it may be desirable to modify existing components so that five digits of digital selection or more.



   We will now consider the second method which has been proposed and for which a special group of recorder-translators must be provided at the originating office for the establishment of communications requiring the recording of the call, whether these recordings are carried out 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 the cipher switches these devices may be of simpler construction.

   As has been described in connection with 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 caller. requested office, after which the entire number is repeated to it; In order to store and retransmit the requested number, the special group of level 0 recorders-translators may be provided with electro-mechanical devices for the preservation and regeneration of pulses of the type already mentioned.

  <Desc / Clms Page number 32>

 



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



   The advantage of this arrangement is that the translators of level "0" 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 group of relays of this office which gives access firstly to a recorder-translator or pathway discriminator which carries out the routing of the call to the requested office and secondly to the recording devices of the 'call. This method makes it possible to reduce to a minimum the translators of level "0". Such a "0" level translator recorder will be described later with reference to Figures 8 and 9.

   As regards the flow of recorded calls, it is further proposed, according to the invention, to combine in a common group towards a central point all the categories of traffic requiring the identification of the calling subscriber and to allow certain subscribers, for example those using a prepaid station, to obtain a restricted service, we will arrange so that we can have access to this group of two different levels of switches, one of these being prohibited for selectors serving special service subscribers

  <Desc / Clms Page number 33>

 restricted. Means will be provided at the central point in question to separate the various categories of traffic.



   Referring now to Figure 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 local LRT recorders-translators, the other devices being the same as those described in relation to figure 5. The normal and special primary code selectors have access, via a level such as level 8, at 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 sub-central office.

   In accordance with the number / discrimination received by the TLSR 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 for recording telegrams via the jacks marked TRU-TOL-TEL.



  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. 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 outgoing ORS relays, in accordance with the particular type of primary code selector which caused its setting. service.

   In the case of a call made by an ordinary subscriber, it can be arranged that as soon as the operator

  <Desc / Clms Page number 34>

 failure has plugged into the jack the identification devices are switched on by the ORS start relay group of the local office, after which the calling number is transmitted to the central point or so that the start of the identification devices is set under the control of the operator.



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



   It should be noted that level 1 of the TISR input selector is intended to make the connection to the SRI and SH2 output selectors, via the TLRS long distance 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 is brought up to a certain level, such as level 7, so that if the calling subscriber is an ordinary subscriber re the communication can be established in the manner which has been described in relation to figure 5, while 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 outgoing junctions via level 7. A tone known as "unreachable number tone" is, in this case,

   returned to the calling subscriber and the activated recorder-translator is released.

  <Desc / Clms Page number 35>

 



   With regard to the flow of incoming calls coming from offices located outside the area and intended for a network of several offices with recorder-translators, direct connections between the calling office or the main office of the network will be provided. calling party and one of the central or sub-central offices of the network with recorder-translators. The inbound trunks preferably end in 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 usual way.



   With regard to the charging of communications of this kind, the discrimination equipment will be provided at the office of origin, it will be responsible for determining whether the charging should be effected by ordinary counting or by recording the call. .



   These discriminators will be provided with devices for the conservation and regeneration of the pulses, so as to allow several or all the digits transmitted to be repeated to the sub-central office in order to establish communication via the recorders-translators of the system. sub-central office. In the event that a call requires recording the discriminator, at the originating office, will be designed such that it transmits a signal to the sub-central office to activate the call recording devices. The recording device will retain the characteristics of the number of the called subscriber throughout 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

  <Desc / Clms Page number 36>

 conversation a print or recording controller will be put into service 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 Figures 1 to 6, which have just been described, the circuits of most of the apparatuses shown therein are known to those skilled in the art of automatic telephony, in some cases the patent numbers which relate to it were recalled.



   However, we will study the mode of operation of the circuits put into service for establishing communications through a level "0" recorder-translator located in an office, such as F, in the area with recorders. translators of fig. 4, it being understood that such recorder-translators can, when the digit "0" or the digits "00" is sent, direct the call to a manual table of the neighboring tandem office D and, when sends any group of 2 digits from 01 to 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 establishing communication.



   A group of long distance relays is put into service at office D and firstly gives access to a recorder-translator who has the option of directing the call to any of the offices located outside the area, either directly or by through 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 Figures 8 and 9

  <Desc / Clms Page number 37>

 it can be seen that the recorder-translator represented therein has a step-by-step rotary 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 relay group. long distance, 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 and regeneration device. pulses of the type which has already been 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 of digit A activates the level 0 recorder-translator of figures 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 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 the relay BB operates, at contact bb3, it supplies the relay P; to contact bb5,11 connects the earth to the common wire Il !, for starting the motor, to put the equipment into service

  <Desc / Clms Page number 38>

 generating the pulses S and Z associated with the TD and M relays and to start the motor which controls the springs IMPL and IMP2 which provide the pulses required by the recorder-translator for the transmission of the translated code. on 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 PU remains connected to earth at the contact of the impulse relay of the code selector primary.



   The emitted digit, received by the translator recorder, will be any / digits between 1 and 0, the impulses will be received by relay 4 which, by operating / repeating at contact a2, towards the FM electromagnet which makes step 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 YB 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; resistor YB is used to prevent premature operation of the solenoid RM during operation of relay A.



   During the sending of the pulse train, relay B is intermittently short-circuited to contact al, however it remains in the working position due to the release delay given by this. short circuit; however, relay C operates the first time relay A drops out, therefore it remains in the working position for

  <Desc / Clms Page number 39>

 the entire duration of the transmission of the pulse train, on contact with it, it supplies the regenerator marking electromagnet MM.



   If we briefly consider the operation of the device for preserving and regenerating pulses, it will be noticed 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 each 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 de-energized at the end of the sending each train of pulses, this lever then pushes a pin, corresponding to the emitted number, through the plate carrying these pins and places it on the path of the emitter disc.

   For each digit received a corresponding pin is pushed through the plate, these pins are used to adjust the movement of the transmitter disc which controls the generation of pulses by the LMP3 springs of the generator.



   Returning to the conservation of the first digit by the regenerator, it can be seen that, when the electromagnet RM operates and begins to rotate the receiving disk step by step, the first displacement of this disk mechanically operates the head springs of the regé. - generator which prepares the power supply circuit of the ON relay via the Nl contacts.



   At the end of the transmission of the pulse train, relay A remains constantly in the working position and when relay C drops out, after the delay period due to the short-circuit of the winding, the electro- magnet

  <Desc / Clms Page number 40>

 
MM opens and this electromagnet falls back 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 mm contact, controlled by the marking electromagnet, closes after being opened during the energization of the electromagnet, thereby establishing the circuit of the ON relay which operates and is blocked during any the duration of the positioning, by means of its onl contact, of the head contacts Nl and of the earth.,
RM
Since the electromagnet / regenerator is supplied through contact a1 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 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 falls at the end of the flight, of the pulse train, one and earth is connected, by the intermediary of the slider / of 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 manual table.

   Contacts 2 to 10 of bank F4, corresponding to a second digit between 1 and 9, which is emitted when long distance communication is to be established, are connected to a terminal 13 so that it is the relay SC which operates in that case; on contact sc2 it closes

  <Desc / Clms Page number 41>

 its own blocking circuit.



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



   Two IMP2 impulse springs are connected in parallel on this relay, these springs work in conjunction with the outgoing impulse impulse springs in such a way that when the IMPL springs are closed, the imp2 springs are open and vice versa.



   The motor which controls these impulse springs: has been started beforehand and when the impulse springs IMP2 open their contact for the first time, after the operation of the relay SC the relay IG operates.



  On contact igl, the impulse springs IMP2 are connected to the electromagnet FM of switch F; on contact ig2, the short-circuit placed on the impulse springs impl is eliminated. At contacts ig3 and ig4 the circuits of the relays SC and SM are disconnected from bank F4 of switch F and bank F8 is connected, via contacts ig5, to the
SZ relay / so that it can now be used for the purpose of controlling the total number of pulse trains which are to be emitted by the recorder-translator.



  At contact ig6, the earth connected to wipers 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 scents without effect on this portion of the circuit.



   The relation which exists between the impulse springs IMPL and IMP2, as it has just been described, is such

  <Desc / Clms Page number 42>

 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 impulse springs IMPL; at the start, however, the impulse springs IMP1 are short-circuited via the contact sm4 at rest, to 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 3148, these discriminator digits will therefore be transmitted after the transmission of any 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 IMP1 are inoperative until the wiper F2 has reached the twelfth position which cuts the short 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 wiper passes over these contacts the pulse 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 wiper F2 being transferred to the wiper F6; the broom F2 leaves its bench, the call is directed to the tandem office via a group of relays leaving the originating office, as will be described below.

  <Desc / Clms Page number 43>

 



   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 szl, it cuts the excitation circuit of the electromagnet FM at the contact sz2, finally at the contact sz3, it short-circuits the impulse springs IMP1 and introduces the springs into the outgoing loop pulses IMP3 from the regenerator.



   At this point in the establishment of the communication, a group of interurban relays from the neighboring tandem office will have been put into service, this group of relays has for mission to give access to a recorder-translator of the common group which will direct the call. to the neighboring tandem office located 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 MRB non-conductive; relay D operates under these conditions. Relay D, while operating, energizes relay SS at contact d3, which closes the supply circuit of the emitting electromagnet RM of the regenerator.



   It should be understood that the regenerator pin 'which was / placed 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 the relay P, but because the reset pin has an inclined plane head

  <Desc / Clms Page number 44>

 the sender disc is not released immediately and it remains blocked until the solenoid TM is de-energized.



     At its contacts tm the electromagnet TM cuts the circuit of the relay P which, at the contact p2 opens the supply circuit of the electromagnet; as it was described in detail in the patent n "415894 the transmitter disc is released, it turns 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 to any 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 by means of the springs, impulses IMP1, controlled by the regenerating device, this figure being sent to the recorder-translator, channel discriminator, set tandem office service.



   When relay P drops out, we can see that the relay IS circuit, delayed on 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 retransmission of previous digits may be carried out simultaneously, but independently of each other. .



   When the emitter disc 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

  <Desc / Clms Page number 45>

 IS relay which determines the time between sending two digits the transmitting solenoid TM is energized again momentarily to release the transmitter disc once more and to generate a second train of pulses in the manner which been described.



   When all the digits received have been retransmitted, the transmitting disk meshes with the receiving disk, therefore the head contacts Nl open and cause the release of the ON relay. In addition, if the entire number has been transmitted and transmitted correctly the channel discriminator will receive a complete set of digits to direct the call to the called party, as a result the battery connections to the line wires are restored to normal so that relay D drops out and energizes relay 00 in the following circuit: earth, contacts dl, p3, ss2 and is2, wiper F3 or F8 of switch F, bank contacts, contact on3, 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 A. This relay, returning to rest, causes a return. in the normal position of the digit A selector and sending a signal to the primary code selector so that the latter releases the connecion to the recorder-translator and connects the calling subscriber to the tandem office neighbor, through the starting relay group. When the digit A selector switch relay drops out it also cuts off the recorder controller relay A circuit, which borrows the PU wire, resulting in relays B, BB and other relays including the SS relays, are released;

   the circuit for returning to the rest position of switch F closes via the earth,

  <Desc / Clms Page number 46>

 contacts bb2, ss2, is2, of the wipers and banks F3 or F7, of the switch contacts fm of the electromagnet of the switch F, of the contact bb8, of the electromagnet FM and of the negative.



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



   The recorder-translator and the switch of digit A are again available for other uses and the establishment of communication continues 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, by means of the wiper and of the bank F4. When this relay operates, on contact sml, it energizes relay S, on contact sm4, it connects banks Fl and F5 to the impulse springs
IMP1 such that, in the present example, it directs the call through discriminator digits, such as 3147, to a manual position 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 SZ relay operates the circuit of the 00 relay is closed by the intermediary of contacts sm3 and sz4 so as to cause the release of the recorder-translator and of the digit A selector. In this case, therefore, when the relay co operates, the digit "0" will be kept in the regenerator and when the relays A, B and BB drop the relay ON by returning to the working position

  <Desc / Clms Page number 47>

 keeps relay P energized;

   on contact bb5, the IS circuit will close through the earthed s4 contact and during the relaxation time of the SS relay. The IS relay, while operating, keeps the SS relay circuit closed by means of the earth and the is3, on4 and ssl contacts.



   During the time that elapses between the release of relay B and the next operation of relay IS, the voltage is brought through the contacts P2, bl and isl, to excite the emission electromagnet TM 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 the transmission of the figure stored by the regenerator, the relay P is at rest and short-circuits the pulse springs IMP3 of the regenerator. When the complete train of pulses has been emitted, the ON relay drops out in its turn, it releases the SS and IS relays, when these two relays are in the rest position, the earth is brought in via the bbl, ss2 contacts. and is2, wipers and benches F3 or F7 to return the switch F to the rest position; the recorder-translator is now available for other functions.



   It should be noted that when the recorder-translator is put into service, the thermootatic relay circuit TH is closed by means of contacts bbl, and c2 and of the wiper F4 in position 1. This relay requires about four seconds to close its contacts, the result is that if the calling subscriber sends only one digit 0 and then waits four seconds or more, the relay TH will operate; 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,

  <Desc / Clms Page number 48>

 
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 requested number, the TP and M relays operate as follows:

   the common S and Z wires, connected to these relays, extend to a delay group comprising the S and Z pulse cams arranged to give earth pulses on these wires with a well defined time relationship. When the relay B has operated in the recorder-translator, an S pulse activates the relay TP 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, relay M operates under the action of its upper winding and is blocked by the action of its winding. lower, via the earth and the m3 and bb2 contacts.

   On contact ml, the SS relay circuit closes; on contact m2, the outgoing loop is cut to release the selection train which has been put into service by the recorder-translator. At contact m4, relay a is disconnected from the wire
PU and it returns to idle, which causes the release of relays B, BB and SS. The earth is also extended towards the forced release wire FR, via the contacts b2, is4 and ss6 during the release of the SS relay, it will be understood that this causes the forced release of the selector of the number a and the sending of a so-called "unreachable number" tone to the called subscriber, by the primary code selector.

   The recorder-translator is also returned to the normal position where it becomes available for other uses. than
It will be appreciated that this / 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 which is described

  <Desc / Clms Page number 49>

 in the 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. To be able to apply this possibility, additional devices are needed in the recorder-translator which, if the number of groups of expensive discriminators is sufficiently large, will be designed approximately like the normal type of recorder-translator described in the British patent. N 469,184
We will now consider 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 first of these, which is shown in FIG. 10, causes, when it is put into service, the switching on of the calling line identification apparatus, it receives the indication of the call line. The identity of the calling number in the form of a code which is stored in a device for preserving and regenerating the pulses 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, via the p wire, to energize the relay JA, this relay supplies the relay JB via its contact ja3; to contacts ja4 and ja5, it connects the incoming positive and negative wires to the outgoing junction to the neighboring tandem office. A loop allowing the repetition of the pulses is therefore established from the primary code selector directly through the group of outgoing relays, to the arrival selector of the neighboring tandem office; Incoming channel discriminator digits transmitted by the recorder-translator are used to direct the call to a long distance relay group of 1.

  <Desc / Clms Page number 50>

 tandem desk, which is shown in Figures 11 and 12.



   Returning to the operating mode of the outgoing relay group, it is assumed that immediately after it has been put into service, the calling line identification device will be activated to communicate the details of the identification of the calling number to the starting relay group, where it will be kept. on contact ib5, the relay JB while operating, extends the earth, via contact rb3, to energize the relay RA, 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 and counted traffic in an ordinary manner, pins 17 and 18 will be joined so that the RA rail cannot operate only if a discriminating AC signal (indicating that the call should be recorded) has been issued on the private wire P, to operate the IP relay and an ordinary DC relay connected in a rectifying circuit the two halfwaves and comprising the rectifiers MRC and MRF, connected to the incoming wires P via the capacitor QD.



   When the RA relay operates, at contact ra6, it closes the energizing circuit of the regenerator IMM marking electromagnet, via contacts jb5. lpl and ra6; to the contacts from ral to ra5, it connects the starting relay group to the common wires leading to the calling line identification device.



   With regard to the calling line identification apparatus, it should be understood that this is of the ordinary type, as already mentioned, in which the private wire associated with each line in an office is marked with 'a code which is the callsign of that particular line.

  <Desc / Clms Page number 51>

 



  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 regards 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, transmitting signals in one or more of these parts the different ones. figures will be translated. The parts without signals are called spacing pulses and those accompanied by a signal are marking 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 given. independently of the conservation wires, through common wires coming from the identification device and ending in the starting relay group. Assuming, for example, that the five parts of the code are denoted by VWXYZ respectively, the digit 1 will be transmitted emitting a marking pulse in parts V, W, the code for the various digits being shown in the table below. : VW-1 VX - 2 Wx -5 VY - 3 WY-6 XY - 8 VZ - 4 WZ - 7 XZ - 9 YZ - 0.



   So for a four-digit number a total for four groups of five pulses / each will be transmitted and can be stored in the pulse storage and regeneration device of the starting relay group as a five-unit code like it has been received. Each group of five consecutive pins in the regenerator forms a number and the pins of each of the

  <Desc / Clms Page number 52>

 groups of five are moved in accordance with the received marking pulses.



   Returning to the operating mode of the outgoing relay group circuit it can be seen that when the RA relay operates and if the subscriber identification device, or line marking device as it can be called in variant, is not already in function and does not complete an identification cycle, an earth will be connected to the common wire S which will make the relay RB operate under the action of its right winding, this relay is blocked via contacts brl and jb5 under the action of its left winding.



   At contact rb2, the MRI receiver electromagnet of the regenerator is connected to the pulse sending wire PU, ready to receive the spacing pulses; at contact rb3, the initial excitation circuit of relay RA is open and this circuit is kept working by means of 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 a complete identification cycle, that is to say until the moment when the earth is momentarily disconnected from this wire to signal the end of a cycle to all calls which have been fully identified. At contact rb5, the earth is extended from contact ra5 to the common starting wire RST in order to trigger the start of a line marking cycle.

   During the identification or cycle of line marking, each step causes the sending on the PU wire of a positive spacing pulse, the receiving electromagnet
Regenerator MRI advances the receiving disc and scoring arm along the circular row of pins.



  Whenever a marking pulse of

  <Desc / Clms Page number 53>

 alternating current is received through the private wire, the IP relay works; on its ipl contact, it cuts off the circuit of the IMM 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 onto the path of the emitter disc, at the same time the lmm contacts controlled by the electro - Marking magnet close after they have been opened while the electromagnet was energized. Therefore, the circuit of the MMR relay is established by means of its winding of: left, The MMR relay at its contact mmr5 cuts the circuit of the IP relay which drops out and again energizes the IMM marking electromagnet; on contact mmrl it is blocked by means of its right winding and the PU impulse wire grounded, until the sending of the impulse is finished.



   At the end of sending the pulse the MMR relay drops and reconnects the IP relay to the private wire so that it is ready to receive a next marquege pulse.



   Assuming that the subscriber number is 1359, twenty code signals will be received by the regenerator, of which pulses number 1 and 2,6 and 9, 12 and 13, 18 and 20 are pulses. marking, the others being spacer pulses. Corresponding pins are moved in the row of twenty consecutive regenerator pins, in this way the subscriber number can be stored as a code by means of the pins that have been moved.



   If the subscriber calling from an office with recorder-translators has a number of three letters and four digits, the first part of the number

  <Desc / Clms Page number 54>

 will be the same for all the subscribers connected to this office and it 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 the relay.
IP through a nonlinear NLR resistor which, when a suitable AC current is applied to the EC wire, sees its resistance decrease enough for the IP relay to operate in series with it.



   The five unit code is used to communicate 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 already described. When the identification cycle is finished, the earth is momentarily removed from the common wire Z and relay A drops out. The circuit then remains in this condition until the end of 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 this occurs. establishes a long distance call through a trunk relay group of the neighboring tandem office.



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

  <Desc / Clms Page number 55>

 



   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, via a 25-point HS rotary switch, to the translation and discrimination devices serving the switching train and then providing access to the call recording devices. it is also intended to store the called number in a pulse storage and regeneration device, 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 an earth pulse given every six seconds during conversation.



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

     When the trunk relay group is put into service, a loop circuit is extended, from relay D and an impulse spring of the home office recorder-translator in Figures 8 and 9, through the train code selectors, the outgoing relay group, the junction to the tandem office and the arrival selection train from this office to operate relay R of the inter- relay group.

  <Desc / Clms Page number 56>

 urban from 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 regenerator. until access is given, through the ES searcher, to the equipment of a discriminating recorder-translator which serves the intercity switching train.



   When relay R operates, at its contact rl, it causes the energization of relay 1B which in turn causes relay BA to operate. When the BA relay operates, it closes its own blocking circuit on its contact bal; on contact ba2, it extends a blocking earth to wire P; on contact ba5, it closes the excitation circuit of the KR relay; finally, on contact ba6, it closes the supply circuit of the MD relay.



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



   It will be remembered that the HS researcher has access to recorder-translators or to printers, and we have arranged for the research to be carried out primarily in the bench contacts connected to recorder-translators. This result was obtained by arranging so that the circuit of the switching relay K of the frotters can only be closed by the intermediary of the bank contacts of the switch ES 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 contact kr7, bench and wiper HS9, contacts lb4, k2 and krl, resistance YC,

  <Desc / Clms Page number 57>

 of contact kr2 and of the windings of 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, ie when the RS8 slider encounters a negative, at which time the K relay will operate. While operating, it cuts the circuit of the electromagnet at contact k3, to stop the rotational movement of the switch; on contact k2, it causes the excitation of relay KA; at contact kl, it connects a guard polarity to the HS8 test brushes, through its low resistance lower winding.



   When the KA relay operates, at its kal contact, it cuts the circuit of the KR relay, 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 ka6, it closes the excitation circuit of relay 1BB.



   The relay K by operating, cuts, at the contact k2, 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, this circuit comprising : earth, contact kl, upper winding, contact kr2, resistors YC and YD, negative;

   is designed to give a suitable release of this relay in the event that two relays K from two groups of inter-city relays are switched in principle simultaneously on the

  <Desc / Clms Page number 58>

 same recorder-translator, in the case of a double connection, the two K relays 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 low resistance windings 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 satisfactorily and their respective researchers continue to rotate.



   As a result of the speed difference, 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 associated with it will operate 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 after which the circuit of the upper winding is cut off and the relay K remains blocked under the action of its lower winding alone.



   When relays KB and 1BB operate, contacts kbl and kb2, lbb5 and lbb6 connect the outgoing positive and negative wires, to the right of the circuit, to the negative and positive pulse wires of the recorder-translator; at contact kb3, the control electromagnet circuit is cut once more. Relay 1BB, while operating, locks at its contact lbbl regardless of the state of relay KA.



   The original office recorder-translator is now connected through the group

  <Desc / Clms Page number 59>

 from long distance relay to the recorder-translator which in turn is connected through the long distance relay group to the train of outgoing interurban switches of the tandem office.



   It should be noted that the polarities connected to the negative and positive wires entering the recorder-translator of the tandem are the opposite of those given by the relay R, so that the relay D of the recorder- local translator now works and causes the sending of the emitted number which was stored in the pulse regenerator.



   This information is received in the recorder-translator of the tandem office which carries out the translation necessary to establish the communication to the requested subscriber, at the same time the information is communicated to the storage and regeneration device. pulses of the trunk relay group as will be described below.



   When the KB and 1BB relays are operating, it should be noted that the 2RM and 2MM reception and marking electromagnets are connected via the wipers HS4 and HS5 to the recorder-translator put into service, and we must notice that the 2MM marking electromagnet energizes immediately to release the lever from the pins and to hold it ready to receive pulses by the 2RM electromagnet. it should be understood that the decimal pulse trains received by the recorder-translator are also changed into codes of five units as has been described in relation to the line marking equipment, these trains are transmitted by the '' intermediary of HS4 and HS5 benches and wipers towards 2RM and 2MM electromagnets

  <Desc / Clms Page number 60>

 reception and marking of the regenerator.

   For each digit received, the 2RM electromagnet receives five pulses and a marking pulse is transmitted via the banks and HS5 wipers for two pulses of each group of five pulses, each marking pulse causes the switch to cut off. the connection to the earth of the HS5 bench and releases the 2MM marking electromagnet so as to move certain pins in accordance with the particular numbers transmitted as has been described in connection with the keeping of the calling number in the form of a code in the regenerator of the starting relay group.



   When the recorder-translator of the tandem finishes sending the discrimination digits to direct the call to the requested subscriber, its function is terminated, it therefore removes the negative marking of the contact on which the HS8 wiper is located, which pro - refers to the release of relay K from the interurban relay group. Relay K on falling in turn releases the relays KA and KB and more, since the recorder-translator of the original office will have been removed from the circuit at this time, the conversation circuit will be established through the closed contacts k3 and k4, capacitors QA and QB and closed contacts kl and k2.

   The relay KB, when released, also closes, at contact kb3, the return circuit of the HS switch in the rest position, as follows: wire 21 grounded via the delayed alarm equipment which operates if the switch does not come back. not at rest, contact kr7, wiper and, HS9 bank, contacts kr3 and kr5 depending on the position taken by the wiper HS9 on the bench, contacts db5, k3 and kb3, hsm switch contacts, HSM electromagnet, negative; switch wipers

  <Desc / Clms Page number 61>

 HS therefore rotate to the rest position.



   At the end of the establishment of the communication the called subscriber is rung through the final selector of the remote office in the usual way, when he answers the battery polarities are reversed on the conversation wires of such. so that the rectifier MRL connected in series with the relay 10 of the trunk relay group becomes conductive and the rectifier MRK non-conductive. Relay 1D therefore cannot now operate in series with delay impedance 1; on Idl contact 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 the ddl and dd2 contacts, repeats the battery polarity reversal towards the primary code selector at the original office to provide the necessary supervision. When the MD relay drops out with a certain delay, the duration of which serves to prevent charging which could be due to the momentary operation of the IO relay as a result of on-line faults, the circuit of the KB relay closes via the wiper. HS10 in position 1.



   When the DB relay operates, it locks at the dbl contact and, at the db4 contact, it connects the impulse wire 23, giving earth every six seconds to the HSM electromagnet. an earth pulse is given on wire 23 every six seconds and consequently the HSM electromagnet moves the wipers of the HS switch step by step. We have arranged in this circuit so that the charges do not take place not until the HS switch has advanced two steps, that is, until a

  <Desc / Clms Page number 62>

 period of six to twelve seconds has elapsed, during this period the calling subscriber has time to release the connection established 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 PU operates by means of the HS10 brush in position 3, at the contact pu3, the USM electromagnet of the US switch giving the indication of the units of minutes is connected to wire 23, from such that the next pulse, given after six seconds, excites the USM electromagnet; at the end of the impulse the electromagnet drops to move the wipers
US1 and US2 from the rest position to position 2 which indicates the start of the first minute. The relay PU then drops again until the switch HS has reached position 13; when it works again, it advances the minute mechanism by one step, which reaches position 3, which indicates the start of the second minute.

   After another ten paces of the switch
HS, ie after another minute, the US switch advances to position 4 which indicates the start of the third minute.



   When the ES10 brush reaches contact 25, the DP relay operates and is blocked by means of the dpl, db2, ba6 and earth contacts. The DP relay while functioning prepares a new supply circuit for the PU 'relay via the sixth contact of the bank
HS10, so that this relay operates again twelve seconds before the elapse of three minutes, which occurs when the hs10 slider reaches contact B.

   When the PU relay operates this time it no longer closes the circuit of the USM electromagnet because it is cut on contact dp4, but on the other hand a circuit is established, by

  <Desc / Clms Page number 63>

 through contacts dp5 and pu4, to connect a tone transformer, connected to common wire 24, to the central winding of relay R from where a warning tone will be sent by induction on the line wire for let the subscriber know that the first charging period has ended. When the HS10 brush reaches the next 9 contact, an earth is brought, via the contacts pu2 and dp2, to short-circuit and release the relay DE, therefore, at the contact db5, the return circuit in position of HS switch rest closes.

   The DP relay drops out when the DB relay is released, but the PU relay remains blocked, through the pul and db2 contacts and the ba6 grounded contact, until the DB relay is re-energized when the finder HS reaches its resting position.



   The HS switch then begins another cycle and three more minutes are registered by the US switch. If the conversation continues, at the end of the ninth minute, the wipers at the US switch will be brought from position 9 to position 10 in which the ulO contacts close mechanically and establish the electro excitation circuit. -switch TSM magnet says tens of minutes. At the start of the tenth minute the two electromagnets USM and TSM will receive an excitation pulse and they will bring the wipers US1 and US2 to position 1 and the wipers TSL 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 registered the units switch will have its wipers returned to the off position. reposll, while the wipers of switch TS will be placed on contact 3. Using the two switches US and TS one

  <Desc / Clms Page number 64>

 A conversation lasting ninety-nine minutes may be recorded and warning tones given to the subscriber at the start of each new three-minute period.



   When the calling subscriber hangs up, the relays
R, 1B and 1BB drop in their turn, the relay BA remains at work to control the group of long distance relays through its contact ba2 and to switch this group of relays to the call recording device.



   The recording of the call is then carried out as described below.If it is desired to record only the actual calls only, terminals 21 and 22, in the circuit of the ION relay, will be interconnected in such a way. so that if the DB relay did not work because the called subscriber did not answer, the ION relay will work when releasing relay 1B to cut off the excitation circuit of relay BA, at its contact lon2 , and to bring about the release of the long distance relay group without having had access to the call recording equipment.



   If relay DB has operated and has blocked - 'or if connections between terminals 21 and 22 have not been made, when relay KR operates again through contacts ba5, kal and lbb4, when releasing relay 1BB it will, on contact kr6, cause the searcher HS to advance outside of the sound part. bench giving access to recorders-translators, and this device will undertake a search in the part of its bench giving access to printer controllers, the test circuit is as follows:

   (kr7, alarm wire 21), wipers of the first part of bank H9, rest contacts lb4 and, k2, contact krl and resistance YC in parallel with resistance YE, contact kr2, windings of relay K in

  <Desc / Clms Page number 65>

 series, HS8 test wipers.



   When a free printer controller, marked with a negative across a resistor, as in the case of a free recorder-translator, is found, the K relay operates to stop the advancing movement, to operate the KA relays. and KB and release the relay KR.



  When the relay KA operates, at contacts ka3 and ka4, it switches the incoming positive and negative wires to the printer controller which is ready to receive the code signals representing the calling number; the relay KB, while functioning 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. 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 outgoing relay group circuit 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 through wire P is cut off. ; the result is that the JA relay drops out.



   If the call requires, as described above, a separate recording of a single or multiple unit count, during the search for a free printer controller at the tandem office a negative will be brought from there. winding of relay R of the interurban relay group 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 by the informed person.

  <Desc / Clms Page number 66>

 from 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, a ground is then brought through the ja2, jb2 and sr7 contacts to wire P. The momentary disconnection of the earth of this wire during the time of the release of the relay JA provides the cut-off period necessary for the release of the intermediate switches and the 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 commissioned printer controller to the starting relay group, this pulse operates the S relay through the QC capacitor and the windings. of the TR transformer. When the relay S operates, on contact s2 it energizes the relay SR. Via the head springs, earthed, lNl of the regenerator, and it provides an auxiliary earth for its own power supply, to the contact sl. When the SR relay operates, on contact srl it again activates the JR relay so that the short-circuit placed at the terminals of the JB relay is cut before this relay has had time to drop.

   At contact sr2, the circuit of relay S is made dependent on contact sl; on contact sr3, the blocking circuit of the SR relay is established; on contact sr6, the MMR relay is energized by the action of its left winding by means of the switch springs IMP4

  <Desc / Clms Page number 67>

 of the grounded regenerator. The MMR relay is blocked by the action of its right-hand winding via and earth, the mmrl and sr4 contacts / switch contacts ltm of the emission electromagnet of the regenerator; 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 signal sending in alternating current by the group of trunk relays, the relay S drops, so the earth is brought through the head contacts 1N1 of the regenerator and the contacts s2. , mmr2 and sa2 to energize the ITM electromagnet of the regenerator, the SA relay having operated when the MMR relay was energized.



  The ITM electromagnet, while working, opens the blocking circuit of the MMR relay at contact ltm, when the MMR relay drops out, it opens the excitation circuit of the electromagnet at the mmr2 contact.



   When the ITM electromagnet 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 by rotating transmits the number of the calling subscriber in the form of a five-unit code as described above, the distinction between the marking and spacing pulses being effected by the transmission of a 50 period pulse for each spacing pulse and by emitting a 50 period pulse and 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 frequency of 50 periods that is transmitted during each pulse, operates a relay.

  <Desc / Clms Page number 68>

 tuned to this frequency in the printer controller relay group, which steps a switch stepping through twenty positions. When a marking pulse comprising 50 and 150 period pulses is transmitted, another relay operates and connects a ground to a wiper of the switch in question which energizes a particular holding relay in accordance with the position of the wiper.

   Four groups of custody relays are provided in the printer controller relay group, each group comprising V.W.X.Y, and Z relays by which the codes of five units can be translated into ordinary numerical numbers.



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



   When the sender disc is released and begins to rotate it closes the impulse springs IMP5, thereby the impulse springs IMP4 open and release the Sa relay which is ready to operate the MMR relay again. The MMR relay being in rest position a current source at the frequency of 50 and 150 periods combined and connected, to the common wire 20 is connected, through the impulse springs IMP5 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 advances from position 1 to position 2 and is connected to the conservation relay V of the first group ready to receive the number of the calling subscriber, it being understood that the reception of these two frequencies in this initial point of operations has no effect on the relays.

  <Desc / Clms Page number 69>

 number retention.



   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 1RP reset pin in the transmission disc has not arrived at this time against a displaced stop pin, such as the 1SP pin representing the first marking pulse retained by the regenerator, the relay MMR, while working, blocks under the action of its right-hand winding and through the ltm switch contacts, earthed, of the electromagnet, When the IMP5 springs close for the second time and the MMR relay is in the working position, a 50 period alternating current source, grounded, is connected to the common wire 19 and connected through the transformer TR and the junction to the relay group of the printer controller,

   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 meets 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 by means of the impulse springs IMP4 which are closed and the sal contact. The MITM electromagnet energizes again and on contact ltm causes the release of the MMR relay which, in turn, cuts off the power supply circuit of the ITM electromagnet.



  With the MMR 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 conservation relay

  <Desc / Clms Page number 70>

 corresponding in the relay group of the printer controller,
If the next pin is not moved, then when the 1MP4 pulse springs 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 period of time. 'opening of the IMP4 springs when the IMP5 springs are 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 emitter disc S engages with the receiver disc R, therefore the head contacts 1N1 open and release the relay SR which removes the guard polarity placed on the P.



   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 further calls, arrangements will be made for the blocking negative to be extended, for example. through the positive wire, up to the starting relay group, so as to maintain the JR and JB relays in the working position and to maintain the protective earth on the P wire, when the SS relay drops.



   As soon as a junction becomes free for other calls, the blocking is removed on it at the tandem office and the relay JR, returning to idle, shunts the relay JB to release the junction.



   In the event that communication is not established or recorded and that, consequently, the information relating to this is not required, the JR relay will not remain powered in the working position by

  <Desc / Clms Page number 71>

 through the positive wire when the relay JA drops, when the calling subscriber hangs up his receiver, so that the relay JB will be short-circuited and released. By dropping relay JB, on contact jb6, energizes the SR relay 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 the transformer TR is switched off on ignition jb3.



   Now returning again to the examination of the functions of the trunk relay group of Figures 11 to 12, it can be seen that when all the details of the calling number have been received by the relay group of the printer controller, a ground is given via the bench and the HS1 wiper to energize the ION relay. When the ION relay operates, it is blocked by means of its lonl contact and the 2N1 head contacts of the regenerator which are earthed and at the lon2 contact it cuts the circuit of the BA relay. During the relaxation period of the relay BA, 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 standby, 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 ION relay, at contact lon3, reconnects the guard polarity to the incoming wire P through the rest contact bal; contact lon4 closes the RR relay excitation circuit. when the RR relay operates, it is blocked via its rrl contact and it closes the 2P relay excitation circuit. When operating, the 2P relay,

  <Desc / Clms Page number 72>

 closes, on contact 2p2, the excitation circuit of the emitting electromagnet 2TM of the regenerator; on contact 2pl, it makes the operation of the relay RR dependent on the switch contacts 2tm of the emitting electromagnet so that when these contacts open the relay RR drops out. and cuts off the power supply circuit of the electromagnet.



   The electromagnet 2TM, returning to rest, releases the emitter disc from the regenerator in the usual way and the latter, by turning, controls two groups of impulse springs IMP6 and Il @? arranged in the same way as those of the starting relay group. At the same time the receiving equipment of the printer controller relay group has been made suitable for receiving the code pulses representing the called number, these being emitted by the springs IMP6; we arrange for the spacing pulses to be transmitted through the IN wire to the printer controller and through the contacts ka4 and rr3 and likewise so that the marking pulses are transmitted on the negative wire IN via contacts ka3 and rr3.



   The first impulse will always be transmitted by the regenerator when the RR relay is in the normal position, therefore it will be sent from the impulse springs IMP6 through the contacts rr3 st. ka3, the negative wire IN, the wiper and the HS2 bench.



   During the sending of this pulse, the springs IMP7 open and release the 2P relay so that when they close again at the end of the sending, the RR relay operates. If no displaced pin, such as 2SP, is encountered by the sender disk reset pin 2RP, the next pulse will be. sent on the positive wire il% while the RR relay is in the working position.

   Until

  <Desc / Clms Page number 73>

 until a displaced pin is encountered, spacing pulses will be sent to the printer controller, via the positive wire IN, the wiper and the HS3 bank, as soon as a displaced pin is encountered the emission is stopped by the 2RP reset spindle which has butted against the 2SP stop spindle; the 2P relay excitation circuit closes as follows: contact lon4, reset pin 2RP, particular pin such as 2SP, contact rr2. The 2P relay, when operating, closes the 2TM electromagnet excitation circuit, which in turn cuts the RR relay circuit; last cuts the 2TM solenoid supply circuit.



   The emitting disk is released again and because the RR relay is in the normal position the first pulse emitted will be a marking pulse consisting of a ground connected to the negative wire IN.



   While this pulse is being sent, the cut-off springs IMP7, when opening, cause the release of the 2P relay as before; at the end of the sending of the impulse, when these springs close again; RR relay operates and spacing pulses consisting of a ground connected to the positive wire continue to be output until a displaced pin is encountered, that pin indicating the presence of a marking pulse,
In this way the called number is transmitted from the long distance 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 communication, this being given by the long distance relay group.



   It should be noted that the banks TS1 and TS2, US1 and US2 of the switches TS and US, are connected to five frot

  <Desc / Clms Page number 74>

 teurs marked HS1, 2, 3, 6 and 7, the banks being interconnected in such a way that, in accordance with the positioning of the wipers, a group of five conservation relays V, W, X , Y, Z of the printer controller, connected respectively to the trotters banks HS1,2,3,6 and 7 can receive the information concerning the duration of the communication 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 HS5 wiper bank, so that this earth can be given through the contacts kb6 and lbb7 to the wipers TSL and TS2 of the tens switch TS.



   If we suppose, for example, that the duration of the communication is twenty seconds, the wipers TS1 and TS2 will be in position 3. The wipers HSL and HS3 will be connected to earth, which will operate the relays V and X of the printer controller 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 reception of the tens indication, a second group of conservation relays is connected to banks HS1, 2, 3, 6 and 7 and an earth is brought by. and through the bench / wiper HS4 and contacts kb5 and ba4, up to wipers USL and US2.



   These wipers will be in position on the rest contact if the duration of the communication is twenty seconds; as a result, earth is fed through the wipers HS6 and HS7 to operate the Y and Z unit hold relays which give "0" as the units digit in the printer controller.

  <Desc / Clms Page number 75>

 



   The printer controller now has all the required information from the interurban relay group for call recording, so it removes the negative through a resistor given by the HS test bench.



  Relay K drops and in turn releases relays KA and KB.



  Relay R 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 release is released, the return circuit for the HS seeker in rest position closes. At the same time the return circuits to the rest position of the US and TS switches close, the first circuit borrowing the earth, the contacts ba6 and kb4, the usnl head contacts of the USNl switch the usm switch contacts of the electro -USM magnet and negative. When this switch reaches the rest position, its return circuit is cut at the usnl contacts which, returning to rest, close the return circuit of the TSM switch.

   In this way the trunk relay group is available for all future uses.



   We will now consider 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 subdivided 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 can be called a "central group office", for all communications being established from one group to another, a central zone office being provided in each zone each of these centers having direct links with most

  <Desc / Clms Page number 76>

 other zone centers and, if possible, with group centers in other zones, when there is a sufficiently large community of interest between them.



   Under these 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 the office in this group. The following digits will direct the call to the requested subscriber.



   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 office, these digits being comprised from 011 to 099 and giving eighty - ten different selections
In the case of a specific 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 so that a smaller number of digits are required, to effect an intercommunication between subscribers from these regions,

   that in the case of Liverpool and interest
Newcastle, the community / between these two cities is not that big. In the case of the London region which has recorder-translators and which has a large community of interest with the Home Counties, communications will be established between these two regions on the basis of

  <Desc / Clms Page number 77>

 call recording, for this purpose forty prefixes, ie 011 to 040, will be reserved in the indicator. The remaining five codes, that is to say 051 to 090, will be used to direct the call to the various zone centers in the country, each of the seventeen zones requiring one, two or three prefixes or codes according to the circumstances.

   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 digits. digital in a district with recorder-translators, the whole being preceded by one or more code digits according to the community of interest existing between the calling and called offices.



   For example, in the case of a call from a London office subscriber with recorder-translators to a Birmingham network subscriber 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 recorder-translator transmits discriminating digits to make the connection to a central or sub-central office in the London area, which ends with the junction to the office center of the Birmingham area which functions as a tandem center.

   The number sent in full including the prefix 081 or, as a variant, the complete number received in the local recorder-translator is then repeated to the tandem center where the call recorder device is located and where the digits 81 will be translated, by the recorder-translator of the tandem, (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.

  <Desc / Clms Page number 78>

 



  The other digits constituting the transmitted number are then transmitted to the center of the Birmingham area, it being understood that for the transmission of the pulses on the junctions a suitable circuit of transmission of the long-distance pulses by direct current or by frequency current will be used. vocal.



   A typical layout of the incoming junctions which can be applied to the center of the Birmingham area is shown in Figure 7, referring to this it can be seen that the ZIS arrival selector, when set to service under the conditions described above, will receive a pulse train which will raise its wipers to a level such as level 0. This level gives access to a primary code selector ICS so that when the called number of seven digits is transmitted from the originating tandem center it is received by the recorder-translator RT to establish the connection in the known manner to the called subscriber of the Birmingham 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 Birmingham zone, in which case arrangements can be made for the London subscriber to have to transmit. four prefix digits, instead of three as stated 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 degree Student.



   In this type of communication, the initial digits sent can be for example 082 or 083, in each case they will be followed by a fourth digit which can be any of the digits from 1 to 8 by means of which the center

  <Desc / Clms Page number 79>

 of the desired group can be selected on a decimal basis.



   When sending the initial digits 082 the communication is directed to the incoming zone selector ZIS 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. 'will arrange so that the fourth digit can be any one of the digits 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 Figure 7.



   When issuing the initial digits 083 it is possible to arrange for the ZIS selector to be activated from the tandem center and so that it rises vertically under the action of a complementary discriminator digit up to a level such as' 9 which makes the connection with secondary ZS2 selectors, Any of the digits 1 to 0 can be sent as the fourth digit in the case considered, this digit will allow the ZS2 selector to select any of the ten groups of junctions resulting in different group centers.



   With the arrangements which have just been described, the selection of any one of the eighteen group centers can be made and it will be noted that these arrangements can be modified on the spot to take account of a greater or lesser number of 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 via a GRTH finder. The first digit or digits of the number are received at the center of the group and are directed to the group translator who trans-

  <Desc / Clms Page number 80>

 puts the necessary discriminator digits via selectors such as GS1 and GS2, to establish the connection to the tandem office.

   The last digit or digits of the number which are not required by the translator of the group to carry out the translation are kept in the GRS relay 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 group center office where there are recorder-translator devices, or channel, which will receive the remaining digits sent and which will direct the call to the requested remote office as described above. These group center offices will also be equipped with call recording equipment.



   It may be found advantageous to terminate calls entering a group center and coming from other group centers in the same zone or from the neighboring network at a GIS arrival selector. 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 such that in the case of a communication passing through the center of the group and intended for offices located outside either the closed numbering system, the translator GRT / placed in service.

   In the case of communications established in the closed numbering system of the group center, where the community of interest between the calling and called offices appears to be

  <Desc / Clms Page number 81>

 be high, fewer different digits will have to be sent than in the case of calls to offices outside the closed numbering system of the group center where the community of interest is less.



   Instead of dividing the country into zones, it can alternatively be divided into regions which will generally 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 is possible to arrange such that a subscriber must first send certain initial digits indicative of the requested region which will connect him to the local regional center where the search for a regional recorder-translator will be carried out. free nal. 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 will then make the connection either directly or through the telephone. intermediary of other recorder-translators in the remote region.

   In this case it may be deemed desirable for the purpose of uniformity 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 concerned.


    

Claims (1)

CLAIMS. --------------------------- 1.a telephone system or similar system comprising a number of networks or zones, each zone having its own closed numbering system, in which means, discriminating the path to follow and determining the discriminating digits which control the establishment of the communication between the calling and called zones, and means for recording the information characteristic of a communication, are installed in a central or sub-central office, selected in the calling zone and which can be a main office . 2. A telephone system or similar system having a network without recorder-translators, as claimed in claim 1, wherein, for communications between satellite offices and a main office where the recording means are located and path discrimination, separate junctions have been provided for local communications to the network without recorders-translators and for inter-zone communications, the junctions provided for inter-zone communications being put into service when a the distinctive signal of such communications is given by the calling subscriber. 3. A telephony system or similar system as claimed in claim 2, wherein the trunk lines provided for inter-area communications are also used for calls to an operator when a distinctive signal for such calls is given. by a calling subscriber and in which means of discrimination <Desc / Clms Page number 83> located at the main office function to direct said calls in accordance with the distinctive signal given by the calling subscriber. 4. A telephony system or a similar system as claimed in claim 2 or 3 wherein said junctions are used for calls, made by a prepaid set, which require the intervention of an operator and in which means of discrimination located at the main office operate to signal to the operator that the call has been made by a prepaid set. 5. A telephony system or a similar system as claimed in claim 1, 2, 3 or 4 in which the communications requested by subscribers connected to the main office by sending a signal distinctive from ordinary calls requiring the intervention of an attendant are directed to lines specially reserved for this service and separate from the lines reserved for calls from prepaid sets requiring the intervention of an attendant. 6. A telephone system or a similar system as claimed in claim 2, 3 or 4 in which the inter-zone communications requested by subscribers connected to the main office and the communications requested by prepaid stations are carried. , by sending the same distinctive signal, to a discrimination device to direct the calls coming from the prepaid stations to an operator position and the calls coming from the stations connected to a central office to a position having access to the devices of recording. 7. A telephone system or a semi- <Desc / Clms Page number 84> Applicable as claimed in any preceding claim, in which the identity of the calling line is established and maintained at the originating office which may be a main office or a satellite. 8. A telephony system or a similar system as claimed in claim 1, 2, 3, 45, 6 or 7 in which the identity of the calling line connected to a satellite office is established and maintained by associated bodies. at the junction line connecting the satellite and the main office, the identity of the calling line connected to the main office being established and maintained by bodies used to provide access to the discrimination and recording devices. 9. A telephony system or similar system as claimed in claim 2, 3 or 4 in which the same distinctive signal is used for all calls originating from a satellite office and which require the activation of a satellite office. special trunk lines to the main office and in which discrimination means, located at the main office, control the routing of the call to the equipment used to provide access to the discrimination and recording devices or to a position of operator. 10. a telephony system or a similar system as claimed in claim 9 in which the same distinguishing digit is used for all calls originating from a set connected to the main office and requiring the intervention of an operator or the service. inter-zone so as to implement discrimination devices which direct the call to an operator position or to said devices. <Desc / Clms Page number 85> 11. A telephony system or a similar system as claimed in claim 9, or 10 in which the discriminating means comprises means controlled by sending a digit and in which the call will be directed to said apparatus. only if the said means controlled by sending a digit work in conjunction with the sending of a digit reserved for the inter-zone service. 12. A telephone system or a similar system as claimed in claim 9, 10 or 11 in which the distinguishing digit, when sent by prepaid stations, causes the communication to be routed to the telephone devices. discrimination that direct the call to a special operator position. 13. A telephone system comprising a network without recorder-translators and a network with recorder-translators in which direct connections are provided between a central office of the network. Without recorder-translators and a central or sub-central office of the network with recorder-translators, the said junctions at their entry into the network with recorder-translators having access, when they are put into service, to devices which translate the discriminating digits, transmitted on this junction and characteristics of the requested office, and which direct the call to the requested office. 14. A telephone system or a similar system comprising a network with recorder-translators having access to several networks either with recorder-translators or without recorder-translators in which a recorder-translator is put into service at the time of letting. '' sending an inter-zone call, to direct the call to a central or sub-central office of the network with translators-recorders <Desc / Clms Page number 86> operators and in which a recorder-translator is put into service at said central or sub-central office to direct the call to the desired network, call recording devices also being put into service at said central or sub-central office to record the call. or 15. A telephony system / similar system comprising a network with recorder-translators having access to several networks either with recorder-translators or without recorder-translators as claimed in claim 14 wherein the first recorder-translator set. in service, in the case of inter-zone calls, is separate and distinct from the recorder-translators used for establishing communications to other network subscribers with recorder-translators. 16. A telephony system or a similar system as claimed in claim 14 or 15 in which the same recorder-translator is used for establishing inter-zone communications and for directing the call to an operator. 17. A recorder-translator for use in telephone systems or similar systems is designed to direct the call to an operator position or to a call recording position in the case of inter-communication. -zones, depending on the value of a digit received after the recorder-translator has been put into service. '18. a recorder-translator as claimed in claim 17 designed to be put into service when sending a digit such as 0, which is normally reserved for an operator, and to operate upon repetition of said digit or in the case of a delay in <Desc / Clms Page number 87> transmission of a second digit so as to direct the call to an operator. 19. A telephony system or similar system as claimed in claim 17 or 18 in which a step switch is provided to operate when sending a transmitted digit after the translator has been turned on. service and determine the route through which communication should be established. 20. A telephone system or a similar system as claimed in claim 17, 18 or 19 in which the determination of the discriminator digits is permanently established by appropriate connections made to the contacts of the switch bank, the wipers. different from this switch being selected in accordance with the discrimination digit. 21. A telephony system or a similar system comprising a network with recorder-translators whose offices have such a relationship with each other that at least certain communications must be charged per record, in which, for communications which must be charged per recording, a recorder-translator is put into service at the office from which the call originates or to which the satellite from which the call originates is connected, another recorder-translator being put into service at the central or sub-central office which gives access to the requested office, the recording devices also being put into service in a central or sub-central office to allow the recording of the call. 22. A telephone system or a similar system as claimed in claim 21 in which the second recorder-translator and the recorders of the communications are put into operation successively. <Desc / Clms Page number 88> by the same means of selection. 23, A telephony system or a similar system as claimed in claim 21 or 22 in which the same trunks are used for calls which are to be charged by the operation of the subscriber's own meter. calling or for communications which must be charged by recording the calls, means being provided which, depending on the nature of the call, determine whether the call should be recorded or not. 24. A telephony system or a similar system as claimed in claim 21 wherein the second recorder-translator is installed in the sub-central office to which the calling office is connected and in which the call recording apparatuses. are also installed in the said office. 25. A telephone system or similar system as claimed in claim 21 wherein the second recorder-translator is installed in the. sub-central office closest to the office or network where the recording of the call is to be made, the devices for recording such communication also being installed in this office. 26. A telephony system or similar system comprising several networks or zones, each zone having its own closed numbering system, in which calls requested by prepaid stations are automatically directed to an operator if the signal sent from such a station indicates that inter-zone communication is required which, in the case of an ordinary subscriber, would have been charged by the recording of the call. 27. a telephone system or a semi- <Desc / Clms Page number 89> Blable as claimed in claim 14 wherein the subscribers employing prepaid stations have access to one group of selectors and ordinary subscribers to another group of selectors, the first group not having access to the outgoing trunks terminating at the office recording when a signal is emitted indicating that the call should be recorded. 28. A telephony system or a similar system as claimed in claim 14 wherein said trunk lines are activated by the selectors of the two groups for calls to the operators or when they are not activated. is not the establishment of communications for which registration is required. 39 ... A telephony system or the like comprising a number of zones, each zone having one or more zone office centers and each zone being divided into groups, these groups each having one or more central offices group and each group being subdivided into a number of offices or networks having .. each its own closed numbering system, in which means discriminating the path to follow and determining the digits? discriminators which control the establishment of communication between the calling zone or group and the called zone or group and means for recording the characteristic information of a communication are installed in a central group office or a central office zone of the calling group or zone. 30. A telephone system or the like as claimed in claim 29 in which the number of digits controlling the operation of the path discriminator means is small when it comes to <Desc / Clms Page number 90> to establish communications between groups or areas with a large communities of interest and greater when it comes to establishing communications between groups or areas with a lower communities of interest. 31. A telephony system or a similar system as claimed in claim 29 or 30 in which a zone office-center can also serve as the center-office of a network with recorder-translators and can have access to one or more several group counter offices, incoming calls to said offices having access, when sending a determined signal, to recording and translating devices for the purpose of establishing communication, in the network with recorder-translators and when sending a different signal or different signals having access to one or more group office-centers from where the call is directed to the requested office or network, by an installed recorder-translator at this point. 32. A telephony system or a similar system as claimed in claim 29, 30 or 31 in which the path-discriminating apparatuses are installed in a group office-center to serve subscribers forming part of networks. without recorder-translators and to direct calls intended for such offices to the requested office via one or more group or zone office-centers depending on the route to be taken and the community of interest existing between the two networks in question. 33. A telephone system or a similar system comprising a number of regional networks each having one or more regional centers where the recording devices and the devices are installed. <Desc / Clms Page number 91> the way forward for establishing communications between the region in question and distant regional centers, in which the devices determining the way forward operate under the control of the subscriber to establish communication with the remote regional center and in which d Other discriminating devices installed in such a regional center operate under the control of the subscriber to establish communication with the called office, a signal being transmitted to said subscriber when the remote regional center is reached. 34. A telephone system or a similar system as claimed in any preceding claim in which the pulses which are to be transmitted over long trunk lines are converted into pulses of a special character such as current pulses. at voice frequencies which are more apt to be transmitted efficiently on such lines. 35. A telephone system or the like as claimed in any preceding claim in which the identity of the calling line is. established and maintained at the calling office when a call is made on a trunk intended for the establishment of calls which are to be recorded. 36. A telephony system or a similar system as claimed in any preceding claim in which the transmission of the identity of the calling subscriber number to the registration position takes place at the end of the communication. . 37. A telephone system or the like as claimed in a. ' any / preceding claims wherein the number of the called subscriber is kept at the registrar where the duration of the conver- / -Il- <Desc / Clms Page number 92> This is also recorded, with all other information that needs to be recorded being collected from other sources at the end of the call. 38. A telephony system or a similar system as claimed in any one of the preceding claims in which the same selector has access to the devices determining the route to be followed and to the devices recording the call. 39. A telephony system or similar system as claimed in any preceding claim in which the route determining devices are turned on when the call is made, the recording devices being turned on when the call is made. the end of the communication. 40. A telephony system or similar system as claimed in any preceding mechanical claim in which regenerators / pulses are provided to hold the digits until suitable apparatus is made suitable for them. to receive. 41. A telephony system or the like as claimed in any preceding claim in which pulse regenerators are provided to hold the digits while the route determining digits are being transmitted. 42. a telephone system or the like as claimed in any of the claims! in which mechanical pulse regenerators are provided to hold the digits in one office until the route-determining ciphers generated in a subsequent office have been transmitted. 43. A telephone system or the like as claimed in any of the claims <Desc / Clms Page number 93> in which pulse regenerators are provided to store digits as a code and to retransmit them as a code as well. 44. a device for preserving and regenerating pulses having its own means of operating under the action of two groups of pulses, the pulses of one group having a well-defined time relation with respect to to the pulses of the other group and in which means, pulse generators, are controlled by said first-means to retransmit two groups of pulses corresponding to those received and having the same time relationship between them. 45. A mechanical pulse preservation and regeneration device as claimed in claim 44 in which the retransmission is controlled by external means so that the pulses can be held until required. 46. A mechanical device for preserving and regenerating pulses having separate means operating under the action of two groups of pulses, the pulses of one group having a well-defined time relation with the pulses of the other group and retransmission means controlled by one of said first means for retransmitting pulses in accordance with said second group and at defined time intervals during this retransmission for transmitting pulses in accordance with said first group. 47. A mechanical device for preserving and regenerating pulses having a receiving electromagnet, which moves a part by a certain quantity determined by a group of pulses, and pins which are repelled during said displacement under the action of a second group of pulses having a time relation well defined by <Desc / Clms Page number 94> relative to said first group, a pulse generator being arranged such that when it is started it operates and generates pulses corresponding in number to the number of pulses of said first group as measured by the quantity of which has occurred. said workpiece moved and a second pulse generator being arranged to generate a pulse for each spindle moved, in accordance with said second group of pulses. 48. A pulse preservation and regeneration device as claimed in claims 44, 45, 46 or 47 which operates under the action of a constant number of pulses for each digit which is to be retained and which operates under l the action of a certain number of pulses less than said constant number simultaneously with pulses selected from among said first pulses, this selection depending on the value of the figure to be kept. 49. A telephone system or a similar system as claimed in claim 45, 46, 47 or 48 in which the number of said other pulses is constant also so that the loss of one pulse can be detected immediately. 50. Telephone systems or similar systems in principle as described with reference to the attached drawings. 51. A pulse regenerator constructed and arranged to function as described with reference to figs. ' 11 and 12 of the attached plans, 52. A recorder-translator in principle as described with reference to figs. 8 and 9 of the attached plans.