DE936099C - Circuit and device for the identification of lines - Google Patents

Description

Circuit and Line Identification Circuitry and Apparatus This invention relates to telephone systems, and more particularly to those systems which utilize calling line identification means. In particular, the invention relates to a device for identifying lines which is suitable for use in a previously proposed telephone system with automatic billing, which uses the devices for identifying lines contained in U.S. Patent No. 387,897. This identifier works through a predetermined number of operations to determine the number of the calling line from N N originating a toll call requiring certain data to be recorded. While the previously proposed identification device generally works perfectly satisfactorily, it is somewhat slower than desired in identifying the lines, since it has to count the number of steps taken during each working cycle when searching for the line to be identified.

The invention relates to an improved line identifier for a telephone system of the type mentioned, which is almost instantaneously directional operated to identify a calling line number when on the calling line has a potential used for identification.

According to the invention, each subscriber line is a gas-filled discharge device assigned, which has two electrodes, the first of which is connected to this lead, Which means are controlled by which one arriving via this line Answer the call to conduct the gas-filled device between the electrodes to make, and whose second electrode is connected to control means that depend on of the Conductivity of this device operated to initially to operate a multi-digit memory so that it has a. Part of the digits of the saves the multi-digit name of this calling line, and then stores it. To operate the memory so that it contains the rest of the digits of the multi-digit designation this calling. Line saves.

According to a further embodiment of the invention, an identifier is provided, which has a gas-filled discharge device for each line of the telephone system that does not respond to ordinary potentials that occur during manufacture of the telephone connections are applied to them, and therefore misidentification a participant number prevented.

According to a further embodiment of the invention, the identifier is with equipped with gas-filled discharge devices of the 2-element type; such Devices are economical to manufacture, small in size, easy to house and represent normalized, easy-to-obtain items.

According to a further embodiment of the invention, the identifier is with a gas-filled discharge device of the 2-element type, which each Line of the telephone system is assigned, as well as with a plurality of adjustable Memories that depend on the conductivity of any of these devices and save a multi-digit name that corresponds to the number of the calling party.

According to a further embodiment of the invention are in an automatic Telephone system with company lines improved identification facilities the number of the calling subscriber of the calling company management provided, which by the calling devices of the various calling party members can be selectively controlled so that only those gas-filled discharge devices become effective, the company participants of the associated company management of the telephone system.

According to a further embodiment of the invention -is in an automatic Telephone system with company lines operating on a terminal-per-subscriber basis are arranged, an improved identifier with a gas-filled discharge device provided for each participant of each of the company managements of the system who in establishing a connection from a given subscriber to a given Company management is operated in such a way that 'only those gas-filled discharge devices take effect, the associated participants on all company lines are assigned to thereby only the given participant of the given company management as to identify the calling party.

According to a further embodiment of the invention, an identifier is included gas-filled discharge devices of the 2-element type for each participant one Company management of the telephone system and provided with a control device, those in accordance with a particular calling party of a multiple company line is actuated in a selective manner to an actuation potential. for the gas-filled To provide discharge device that the particular calling party of the Multiple company management corresponds to.

According to a further embodiment of the invention is in a telephone system with an identifier to identify the number of a calling party an improved line selector or final selector is provided, which is designed in such a way that that it indicates that a subscriber line is busy when the subscriber line is either marked as occupied by the known designation earth or if an identification potential is applied to this busy line that indicates the actuation of the identifier controls.

According to a further embodiment of the invention is in a line selector of the type mentioned provided a new type of busy circuit designed in this way is that the short-circuiting of an identification potential applied to a busy line prevented if a line selector tries to connect to this busy one, called line.

The invention provides specially designed and arranged switching elements of the system, which results in the additional circuit features described below be achieved.

The arrangement and operation of the invention is best illustrated by hand to understand the following description of an exemplary embodiment.

Figs. I A, i B and 2 through 5 inclusive illustrate an office a telephone system having the above features of the invention; Fig. 6 shows how the Fig. I A, z B and 2 to 5 are to be merged to form a uniform circuit result; Figure 7 shows one embodiment of the improved busy test circuit for a line voter or final voter of a known type; Fig. 8 shows another Embodiment of the improved busy test circuit for a line selector or final voters of a known type.

In particular, FIGS. I A and i B show schematically the largest part of the facilities of the Office. Figures 2 through 5 show the details of the improved Identifier in the office. Figures 7 and 8 show the improved busy test circuit for a line voter or final voter of a known type, as used in the office got.

General arrangement of the telephone system As in the above mentioned, already proposed arrangement operates the automatic telephone system with billing production a large, densely populated metropolitan area and the surrounding suburbs; which are divided into a number of zones, each of which has one or more offices contains. For example, the operated by the telephone system Districts include zone 35, to which the offices Florida i, Florida 2 and Florida 3 belong. Each office of each zone is designed for ten thousand participants, though it can initially serve a smaller number of participants. With everyone Incoming lines are both single subscriber lines and corporate subscriber lines. The company affiliate leads are on the basis of a special terminal arranged for each participant, so that each participant of a society management has its own port number.

The various offices of each zone are represented by appropriate groups of (not shown in the drawing) main connection lines connected to one another, and at least one of these offices is held by suitable groups of connecting, chargeable lines with one or more of the offices of the other zones tied together. Both the local calls and the toll calls will be with the help of the facilities of the subscriber, which the usual dial include, manufactured. To facilitate the establishment of the connections A universally valid numbering scheme is used, which makes each participant of each Office in each of the zones is dialed as its number is recorded in the telephone book is. The subscriber's number to be dialed therefore contains a code part that consists of consists of three digits, the first two of which the name of the office and the third the Represents the number of the office (e.g. F-L-3 for Florida 3), and a numerical part, which consists of the four digits that identify the terminal of the relevant participant. It should be mentioned here that the numbers of the company participants do not have any additional Require number, since each participant in the company management also only needs one four-digit number that identifies its terminal.

It should also be noted here that the devices shown in Fig. I A and i B represent the Florida office 3, but that the device shown in FIGS. 2 to 5 for identifying the calling line, in addition to the Florida office 3, also includes the Florida offices and Florida 2, provided that these three offices are located in the same building. Establishment of the Florida 3 Office The establishment of the Florida 3 Office is essentially identical to the arrangement already proposed. As shown in Fig. i A, i B and z to 5, automatic dialing devices serving a maximum of ten thousand terminals. The line of the individual participant TR-3 is connected to one of these terminals, and the four company participants TS 1-3, TS2-3, TS3-3 and TS4-3 are connected to four of these terminals via a common line. The apparatus includes a number of line circuits for each subscriber line of the office Florida 3. For example, forming the connection lines 402 X and 403 X of the individual subscriber TR-3 in the line circuit 405 X and the connection lines 12o and 121 of said parallel-connected society participants four in the line circuit 1o2 . It should also be noted here that the individual subscriber TR-3 and the community subscribers TSi-3, TS2-3, TS3-3 and T.54-3 can make both toll-free local calls as well as toll calls to all offices of the metropolitan area outside the zone of the Florida 3 Office; for the latter, fee slips are automatically produced.

The Florida office 3 also includes a group of call seekers, including call seeker 440 X, which has access to line circuits 4o5 X and 1o2 under control of common switch 442 X and caller selector 441 X. Each of call seekers 440 X becomes automatically left on when a call arrives on a subscriber line under control of the dispatcher and associated caller dialer. each call finder 44o X is assigned a first group dialer, e.g. B. the first group selector 5ooX, and each of the first group voters in turn has a finder 450X for a label, access to a group of labels, e.g. B. 300 X has.

Each Florida Office 3 identifier includes a controller 60o X, a code dialer i ioo X, a call memory 1500X and a converter i8oo X. It should be noted here that the identifier may, under certain circumstances, initiate a transmission the stored code digits of a called office needed to transfer the call appropriate ways to direct the called office, and that the transmission of the code of a called office represent a different number of digits with different values can be called code digits of the called office. To carry out this transfer in connection with any call, the exchange has a transmitter 130o X, the is common to all identification devices of the Office and by means of the distributor ioooX can be used by a labeling device can. The transmitter is only used if the identification device is detected has that a transfer is required and it is released again and stands for other marking devices available as soon as the transmitter has the has stored transmitted digits in the marking device.

The Florida office 3 also has a local voter chain that includes the second group dialer 315 X, the third group dialer 320 X and the groups of line voters to which the line selector i io for individual subscribers, the line voter iii for the first social subscriber, the line voter 112 for belongs to the second company participant, line selector 113 for the third company participant, and line selector 114 for the fourth company participant. The group of line voters for individual subscribers, to which the line voter iio belongs, has access to the individual subscribers via their associated bank contacts, including the individual subscriber TR-3 of the Florida office 3. The group of line voters for a first company subscriber to which the line voter iii heard, has access to the associated bank contacts - the 4-participant lines of the office FLörida 3. The 4-participant lines are connected several times to the bank contacts of the 4-participant line selector iii to 114, so that one line selector in each group has access to the subscriber lines of its associated contact bank. The four line selectors for company lines are designed in such a way - that they transmit a ringing current of different frequency via the company line, so that the coordinated ringing of each participant of the company line can be activated selectively according to the frequency of the ringing current. More precisely, the line selector iiz for the first company subscriber transmits a ringing current of sixteen periods and actuates the alarm clock of the first company subscriber TS 1-3 - The line selector 112 for the second company subscriber transmits a 'ringing current' of thirty-three periods and actuates the alarm clock of the second company subscriber TS a-3: The line selectors i 1 3 and 1 14 - the third bz *. ' fourth party subscribers transmit a ringing stream of fifty and sixty-six periods respectively to set the alarm clock of the third and fourth party TS3-3 and TS4-3, respectively.

The four line selectors or final selectors of the system are well known Construction and arrangement and may, for example, so formed and arranged as shown in Fig. 18 of the book, Telephone Theory and Practice - Automatic Switching andAuxilary Equipment «by Kempster B. M i 11 e r, published by McGraw-Hill Böok Company Inc., New York, 1933, except that the test circuit is connected to the C-switch arm of the line selector either according to FIG. 7 or according to FIG. 8 of the present Invention- is modified.

Florida Office 3 also has a facility for manufacturing of fee slips. This contains a number of groups of slip repeaters; one of these groups contains the slip repeater 23ooX, an identifier igoo, a number of tabs, such as the 28oo X tab, a customer strip punch 2968X, an Official Strip Punch 2967X, and a Device For Detecting Date and time 2953 X. For assigning one of the tabs to a calling slip repeater voters 28oi X and 286o X are provided.

The Florida Office 3 also includes a call recorder, such as the Call recorder 2ooo X, which individually identifies each of the system's identifiers assigned. Various modifications are shown schematically in the block diagram in FIG of the call recorder 2ooo X is shown to illustrate how the call recorder controls the identifier igoo shown in FIGS. 2 to 5. The call recorder 2ooo X also contains schematically illustrated storage devices for storage one digit of the Florida office code 3 and the numeric digits of the number of the calling party. The way back identifiers igoo and the Call recorder 2ooo X work together, is explained in more detail below.

The identifier igoo shown in Fig. 2 'to 5 is with each the line voter bank terminals of each subscriber line included in the Office Florida 3 ends; he is common to each of the call recorders, e.g. B. the call recorder 20,000 of the Florida 3 Office.

Each participant has the usual set, consisting of a telephone, an alarm clock and a call facility or dial. The individual participants, z. B. the participant TR-3, and the first participant of each company management, z. B. the first participant TS i-3, set up devices are from known construction and arrangement. Those of the second, third and fourth party members of every company management, z. B. with the participants TS 2-3, TS 3-3 and TS 4-3, installed call facilities are of the special construction and arrangement, that is described in U.S. Patent 2,410,520. The in this patent In addition to the impulse springs, the special number disks described contain special ones button-controlled springs, which are used to keep the calling subscriber on the subscriber line to mark; thereby is from the calling second company participant Earth impulse transmitted, two earth impulses and from the third member of society from the fourth member of society three earth impulses, as detailed below explained.

The Florida Office 3 identifier_igoo has access to 100,000 terminals of the line voter banks of the local voter chain and, as partially shown in Figures 2 through 5, contains a hundred group relays such as the Raio relay, a hundred group designation relays such as the R2i5 relay, and a hundred common group connection relays such as the relay R225. each of the group relays is jointly connected to a hundred gas-filled discharge devices via a hundred resistors. The hundred discharge devices are individually connected to a hundred identification conductors, which in turn are connected to a hundred contacts of the line voter bank into which a particular group of a hundred subscriber lines terminate. The hundred group relays such as the R2io relay, the hundred group designation relays such as R2i5, and the hundred common group connection relays such as R225 are divided into ten groups each containing ten group relays, ten group designation relays and ten common group connection relays. Since each group relay, e.g. B. R2io, is common to a hundred identifying conductors, each group of ten similar relays is connected to a thousand identifying conductors. Each of the ten groups can therefore be identified by the hundreds of line voter bank contacts to which the identifier conductors are connected. The group relay R2io, for example, is jointly connected to the hundred resistors R ii oo to R i igg and the hundred gas-filled discharge devices G i ioo to G i igg, in which the hundred identification conductors C i ioo to C i igg end individually with the line selector bank contacts of the hundred participants are connected whose numbers are iioo to i igg. This group can therefore be referred to as the Eleven Hundred Group. The group relay R25o is common to the hundred identification conductors C i2oo through C i299 and therefore can be referred to as the twelve hundred group. The group relay R410 is common to the hundred identifier conductors C 13oo through C 1399 and therefore can be referred to as the thirteen hundred group. The group relay R450 is common to the hundred identifier conductors C 140o through C 1499 and therefore can be referred to as the fourteen hundred group. The remaining six groups of relays not shown in the drawing are each connected to one of the six groups of one hundred identification conductors and can therefore be called the fifteen hundred group, the sixteen hundred group, the seventeen hundred group, the eighteen hundred group, the nineteen hundred group and the ten hundred group. The group relays R23o, R270, R430 and R470 are connected together with the hundred identification conductors C2ioo to C2i99, C22oo to C2299, C23oo to C2399 and C: 240o to C2499 and therefore as the twenty-one group, the twenty-two group, the twenty-three hundred Group and the twenty-four hundred group. The remaining six relay groups, not shown in the drawing, are collectively connected to the associated identification conductors in substantially the same manner and are referred to as the twenty-five hundred group through twenty-nine hundred group and the twenty hundred group. The remaining eighty group relays, not shown, are each commonly connected to a hundred identification conductors and are designated by the hundred group number which corresponds to the number of the hundreds group of line voter bank contacts into which the identification conductors end. Each of the hundred groups of identification conductors is identified by the group relay connected together with the digit of the thousands and hundreds, which identifies the hundreds of lines connected to it.

The identifier igoo also contains a hundred tens-and-units designation relays, which are provided with the reference symbols Roo to Rgg; they are connected to the hundred contacts of each of the hundred common group connection relays, e.g. B. the relays R225, R: 245, R265 etc. connected. In particular, the hundred tens-and-units designation relays Roo to Rgg are connected, for example, to the hundred contacts oo to 9g of the common group connection relay R225 of the eleven hundred group and to the corresponding contacts of each of the remaining ninety-nine common group connection relays of the identifier igoo. One of the tens and ones designation relays is actuated when connected to the identifier conductors through the contacts of a common group connection relay to designate the tens and ones of the number of a calling party.

The identifier igoo also contains a group of common relays; these include the identification complete relay R310 which is operated in series with one of the tens-and-units designation relays, a common group test relay R320 which is operated in series with any of the operated group designation relays, an identifier test relay R330 and a starting relay R370. The relays R330 and R37o work together to record the identifier igoo of a call e.g. B. the call recorder 2ooo X to be assigned. The identifier igoo also has three slowly falling timing relays R340, R350 and R 36o, which are generally in the attracted position and which drop out in sequence as soon as the identifier igoo is assigned to a call recorder. If the three above-mentioned time relays return to their normal position before the number of a calling party has been determined, the call recorder is given a non-identified signal and the identifier igoo is switched off by the associated call recorder so that it can be used to record the Identify the number of another calling line.

The identifier igoo also has a call recorder finder 598; this is a fifty-contact rotatable level selector to which fifty call recorders are connected. The call recorder finder 598 is used to find a call recorder that requires an identifier igoo and to link the identifier to the call recorder.

Finally, the identifier igoo has four company relays R 56o, R570, R 58o and R 59o, which are optionally activated depending on the position of the calling subscriber on the company line. The relay R 56o for individual subscribers or first party subscribers is also actuated when the call is made on the line of an individual subscriber, since the call facility of all individual subscribers and all first party subscribers is of known design and arrangement. Each of the four relays selectively controls four company control relays R5io, R520, R 53o and R540 in series with a group control relay R550. A group control terminal block TB 5o2 is connected to the contacts of the company control relays R 5 1o to R 54o, which are equipped with multiple contacts. The terminal block TB 5oi of the hundreds group is connected to the hundred conductors, each with one of the hundred group relays, e.g. B. the relay R2ro connected. The various contacts of the single subscriber and corporate subscriber control relay R5io, which is equipped with multiple contacts, are connected to the various group relays, e.g. B. the group relay R2io connected, which contain identification conductors; which correspond to both the individual participants and the first society participants. The contacts of the control relay R 52o equipped with multiple contacts for a second company participant are connected to the group relays, e.g. B. the relay R25o connected, are connected to the identification conductor, which correspond to the second company participant of the individual company lines. The contacts of the control relay R530 equipped with multiple contacts for a third company participant are connected to the group relays, e.g. B. the group relay R410, are connected to the identification conductors that correspond to the third company participant of the individual company lines. Finally, the contacts of the R540 control relay, which is equipped with multiple contacts, are connected to the group relays, e.g. B. the group relay R450, are connected to the identification conductors, which correspond to the fourth company participant of the individual company lines.

If we look again at the group designation relay R2i5 of the eleven hundred group; So you can see that this relay has the WXYZ designation conductor 125, the WXYZ designation conductor i26 and the WXYZ marking ladder i27. These designation conductors are connected to the WXYZ i-code memory, the WXYZ 2 thousand memory and the WXYZ 3-hundreds memory, as shown schematically in the call recorder 2oooX. In addition, the WXYZ marking conductors i25, 126 and 127 are multiple with the corresponding terminals of the terminal blocks connected individually to all of the ninety-nine other group designation relays of the identifier igoo are connected. the WXYZ designation conductors 128 and 129 are connected to the WXYZ4 decimal memory and the WXYZ5 ones memory of the call recorder 2ooo X and are in code form designated to match the tens and ones of the calling party's number to be stored with the actuated tens and units designation relays Roo to R99. It should be noted that only tens-and-units designation relays R oo and R 99 are shown in full. The remaining ninety-eight tens-and-units designation relays are only schematically represented by the two-digit numerical designations oi to 98 indicated, which are to the left of the designation conductors WXYZ 128 for the tens and to the left of the WXYZ 129 designation ladders for the units. Will this Relay actuated, so they control the associated contacts to the label conductor WXYZ z28 and WXYZ reg in accordance with the associated relay designation mark.

Each of the five memories WXYZ i to WXYZ 5 of the call recorder 2ooo X has four relays, which are designated with W, X, Y and Z and which are operated to store digits according to the following code: Earthed Actuated Saved WXYZ-Be WXYZ-relay digit drawing manager of the store WX WX e.g. WY WY 2 WZ WZ 3 XY XY q. XZ XZ g YZ YZ 6 WW 7 XX 8 Y y 9 ZZ o General mode of operation of the telephone system When considering the general mode of operation, it should be noted that when establishing a chargeable connection from one of the individual subscribers or one of the company members of the FLorida 3 office to a called office in another zone, the ticket manufacturer of the FLorida 3 office has a customer strip punch and an official line punch in Action places that create punched strips with the various dates of the conversation. The data of the customer strip contain the call number of the calling subscriber, the first three digits of which denote the name and number of the office, and the last four digits denote the connection terminal of the subscriber; In addition, the customer strip contains the number of the called subscriber, the charge class of the call, the duration of the call, the month and day of the call and, if applicable, the time of the connection. In addition to these data, the official strip also contains information relating to the identity of the various details that were involved in establishing the conversation. The perforated strips can be used at the end of each accounting period to control a printing machine that prints the customer invoices with the data contained on the customer strip, and which then automatically calculates the cost of the call and puts it on the bill. The printing machine operated by the official strip prints a compilation in tabular form which contains the data of all chargeable calls that have gone through the billing apparatus and the designation of the details involved in the establishment of the calls. The identification of the connection number or the number of the line selector bank terminals of the calling individual or company subscriber of the office FLorida 3 takes place in the manner described below by the identifier igoo.

Assume that a chargeable call originates from the single subscriber TR-3, whose terminals are numbered 2i99, and that the call is to a subscriber in a different zone. The call is initiated when the subscriber picks up the handset. This creates a loop through the line conductor 402 X and 403 X closed, the calling party operates whereupon the line circuit 405 X in a known manner to the distributor 442 X and to cause the rotary selector 441 X, to search for a free call viewfinder 44o X. The busy call finder operates in a known manner to find the terminals connected to the calling party's line circuit. At this time, the first group selector 50o X associated with the call finder 44o X causes the identifier finder 45o X to select a vacant identifier, e.g. B. the identification device 3ooX, occupied and assigned to the calling subscriber. The identifier 300X now sends a dial tone back to the calling individual subscriber TR-3 to indicate that he can dial the number to be called. The code part of the number of the called subscriber who is dialed by the calling subscriber is stored in the call register i5ooX of the identifier 300X; this means that it is a chargeable call that requires the assistance of the transmitter 1300X to obtain the directional digits required to connect the call to the called party.

As soon as the third digit of the dialed number is stored in the identifier 300X, the transmitter allocator ioooX is used, which connects the individual transmitter 1300X with the identifier 300X. This has the effect that the transmitter is operated in accordance with the three code digits of the called office and stores the directional numbers in the code part i8ooX of the identification device 300X which are necessary for the establishment of the connection. Furthermore, the identification device 300 X is controlled in such a way that it then transmits certain of the stored digits of the number of the called subscriber, which he has saved, and thereby switches the call through to the called subscriber. Furthermore, the identification device 300 X is controlled in such a way that the call recorder 2ooo X assigned to it individually stores the number of the calling subscriber. The transmitter 1300 X is now released by the identification device 300X so that it is available for other identification devices.

The marking device 300X is now working, and transfers the data stored in it by the transmitter direction numerals, and thereafter, the different in the call storage part i 50o X of the marking device 300 X stored digits on the identification setup viewfinder 450 X first to the array selector 500X. The first group selector 500 is responsive to the first X of the marking apparatus 300X digit received, and selects a corresponding set of principal links and then a free trunk link of the selected group. For example, the first group selector 500 X selects the main trunk with the conductors C 2305 X and C 2307 X that goes to the slip repeater 2300X. The next digit transmitted by the identifier 300 X controls the slip repeater selector (not shown) associated with slip repeater 230o X; the slip repeater selector in turn seeks a free trunk that extends in the direction of the desired called office. The remaining digits are from. the identification device 300 X transmitted via the route described to the main connection line, which goes to the next office, whereby the dialers of the busy main connection line of the next office are operated in a known manner in order to establish the connection to the desired subscriber of the called office.

As mentioned, storing code digits of a called office causes the identifier 300 X to use the transmitter 1300 X to control the call recorder 2ooo X so that operations are initiated by which the number of the calling party is identified and in the An. rufaufzeichner will save overall 2000 X. During the time that the identifier 300X is transmitting the various directional digits and the digits of the called party's number in order to establish the connection, the call recorder 2oooX operates to control the identifier igoo. During the time in which the calling subscriber dials the digits of the called subscriber number, the identifier 300 X is also operated in such a way that it causes a storage in the call recorder 2000 X, from which it can be seen whether the calling subscriber is an individual subscriber with his own line or is a company participant in a company management, in the latter case the number (position) of the participant is also stored on the company management.

The 2ooo X call recorder shows that three company relays are provided, which are labeled R 2020 X, R 2030 X and R: 2040 X. These relays are operated in a selective manner depending on the type of calling party. More precisely, if the calling subscriber is an individual subscriber or a first social subscriber, the three relays R 202o X, R 2030 X and R2040 X remain in the de-energized position. If the calling subscriber is a second, third or fourth subscriber on a company line, one of the three relays R2o2oX, R2o3oX or RZOq.oX is activated and held in the attracted position. The selection of these three relays is effected by the special, cam-controlled contacts of the second, third and fourth participant of a company management. In the present example it is assumed that all three relays R 202o X, R 203 o X and R 20q.0 X are in the dropped position, since the call originated from the individual subscriber TR-3. is gone.

If the call recorder 2ooo X is controlled by the transmitter 1300X in the manner described in such a way that the identifier igoo is activated, a direct earth potential, which is normally applied to the conductor C igo2X, is disconnected from this and replaced by resistance earth, and via the winding of the identification test relay R2iioX. At the same time a direct earth potential is applied to the. Conductor C1903 X laid. These conductors go to the identifier igoo, and the ground potential applied to conductor C 1903 X operates the starting relay R370. The application of the resistance earth instead of the direct earth potential to the conductor C igo2X designates a contact in the bank of the call recorder finder 598 and indicates that the call recorder 2oooX needs an identifier igoo.

As a result of the actuation of the starter relay R370, the call recorder finder 598 finds the call recorder 2ooo X, which is indicated by the application of resistance earth to the conductor C 19o2 X in place of the direct earth. The identification test relay R 21 io X of the call recorder 2ooo X operates as soon as the call recorder searcher 598 has been assigned, and causes the identification connection relay RigioX to be actuated. The last-mentioned relay connects all the conductors that go to the identifier igoo via the various relays and stores them in the call recorder 2ooo X. By actuating the last-mentioned relay, a ground potential is applied to the conductor C 19o6 X and thus the relay R 56o for Individual participant or first company participant of the identifier igoo operated. The assignment of the call recorder 2ooo X to the identifier igoo also has the effect that the identification designation relay R 12o of the call recorder 2ooo X is actuated and a positive voltage of a 6o-volt auxiliary battery 124 is applied to the line of the calling subscriber and therefore to the associated identification conductor, e.g. . B. the conductor C2igg, is placed to control the identifier igoo. The identifier igoö is controlled directly depending on the connection of the 6o-volt additional battery 124 in order to designate the five groups of WXYZ designation conductors i25 to 12.9 according to the official number of the calling office and the thousands, hundreds, tens and ones, which correspond to the terminal number of the calling subscriber on the group selector bank. These digits correspond to the subscriber number of the calling subscriber. The 2ooo X call recorder stores the five digits that identify the office number and the terminal number of the calling subscriber, and the igoo identifier is automatically switched off by the 2ooo X call recorder. The call recorder 2ooo X in connection with the identification device 30o X transmits the identification of the calling subscriber, together with other data in code form, via the identification device searcherq.50 X and the first group selector 50o X to the slip repeater; the Kodemitteilung contains certain office data relating to the present discussion and that are stored in the list repeater 2300 X. It should be noted here that the identification device is locked in such a way that it does not transmit the last numerical digit and thus does not establish the connection to the called subscriber before the identifier igoo determines the identity of the called subscriber and the identifier 300 X all data of the code message to the slip repeater: 230X, who then saves it.

Assuming that the identifier igoo has stored the identity of the calling subscriber in the call recorder 2ooo X and that the identifier 300X has transmitted all the mentioned code messages to the note repeater 230o X, the identifier 300X then transmits the last numerical digit of the called number to the desired Establish connection. The identifier igoo is then automatically switched off by the call recorder 2ooo X after a predetermined time interval has elapsed since these units were assigned. As soon as the last numerical digit of the called number has been transmitted, the identification device 300 X and the assigned call recorder 2ooo X are automatically switched off by the first group selector 5ooX. The various office data relating to the connection are now stored in the slip repeater 230o X in code form; when the called party answers the call, the slip repeater begins timing to determine the duration of the conversation.

When the subscribers of the established connection later hang up their receivers, the dialer devices involved in the connection are returned to their idle position in a known manner. The slip repeater 23ooX and the associated slip repeater searcher (not shown) are not enabled, however, since it is necessary that all data stored in the slip repeater 230o X, including the recorded time, be transferred to a tab which controls the customer slip hole and the official slip hole. As soon as the connection is released in the specified manner, the tabulator arbiter 28o1 X is therefore actuated in order to create a free tabulator, e.g. B. to cause the tabulator 280o X to connect itself via the slip repeater finder 286o X with the relevant slip repeater: 2300X. The call data are then transferred from the slip repeater 2300 X to the tab 28oo X connected to it, and the slip repeater 230o X is released. The tabulator 28oo X then actuates the device for determining the date and time U2953 X and the office and customer note holes, whereby the office note holes 2967X and the customer note holes 2968 X are operated to produce punched strips that represent the various data of the office information or the Contains data for the customer invoice for the call in question. As soon as the data stored in the tabulator, as well as the date and time, have been transferred to the strips through the corresponding perforators, the various units involved in the perforation are returned to their rest position and are thus available for further discussions.

In the foregoing, the operation of the device used in the telephone system has been described, assuming that a call from individual subscriber TR-3 of Florida 3 office is made to a subscriber at an office in a different zone, producing a punched office strip and a punched customer strip by means of which a customer invoice and a compilation intended for the office with the various data relating to the call can be produced. It goes without saying that this device operates in a substantially identical manner when a chargeable call originates from any other calling party, and that the corresponding data are recorded in the same way. For example, the call can originate from one of the company subscribers TS 1-3, TS2-3, TS3-3 or TS4-3 who are connected to the company line with conductors 12o and 121; the call can apply to any subscriber to a connected exchange in another zone, and perforated strips are also produced in the process, from which an invoice and an exchange can be made. In this context it should be pointed out that when one of the company subscribers TSI-3, TS2-3, TS3-3 or TS4-3 calls, the identification device 30o X and the associated call recorder 200o X are selectively controlled by the calling device of the calling subscriber to determine the position of the calling company subscriber on the company line and to transfer this identification to the identification device 300 X and the call recorder 2ooo X. The call recorder 2000 X then works in a selective manner in order to apply ground potential to one of the designation conductors C igo6 X, C 1907 X, C igo8 X or C igog X, depending on the calling company subscriber of subscribers TS i-3, TS2-3, TS3-3 or TS4-3 is.

The application of earth potential to one of the conductors C igo6 X to C igog X controls the operation of the identifier igoo in such a way that the call number of the calling company participant TS i-3, TS2-3, TS3-3 or TS4-3 as 1199, 1299 , 1399 and 1499, respectively. The identifier igoo then designates the four digits of the numeric part of the calling party number on the groups of WXYZ designation conductors 126, 127, 128 and 129, and also the groups of WXYZ designation conductors 125 corresponding to the identifying digit of the calling office, as above described.

Operation of the identifier igoo in detail As explained above in the description of the general operation of the system on the occasion of the establishment of a connection from the calling individual subscriber TR-3 of the Florida office 3 to an office in another zone, the call recorder 2ooo X applies a ground potential to the starter conductor C. 1903 X, and a resistance earth potential instead of a direct earth potential on the holding conductor Cigo2X. The application of earth potential to the starter conductor C 1903 X closes a circuit to feed the winding of the starter relay R370 of the identifier igoo, so that it begins its work. The application of resistance earth instead of direct earth to the holding conductor C igo2X, which goes to the identifier igoo, identifies the call recorder 2ooo X, which is assigned to the identifier 300 X, as a calling call recorder in the bank contacts of the call recorder finder 598.

When responding, the starter relay R370 closes a circuit with contact 372 to feed the seeker magnet M595. The current flow for actuating the magnet M 595 depends on whether the associated switching arm 597 is on a contact that is connected to a holding conductor of a call recorder which does not require an identifier igoo. If, for example, the conductor C igo2 X has direct ground potential and the switching arm 597 is on the contact of the conductor C igo2 X, a circuit is closed via the contacts 372 and 596 and the winding of the magnet M 595 to the battery. The magnet M 595 is fed via this circuit and therefore interrupts its actuation circuit with contact 596, whereupon the magnet is de-energized and its switching arm 597 advances one step clockwise to the next bank contact. This is repeated every time the switching arm 597 meets a contact of its contact bank to which a holding conductor is connected which has direct ground potential. The starting relay R370 also connects to contact 371 the grounded winding of the identification device test relay R330 via contact 372 with the switching arm 597. As long as the switching arm 597 touches a grounded contact, the identification device test relay R330 is short-circuited and cannot respond. However, as soon as the switching arm 597 hits the holding conductor C igo2 X and is connected to the resistance earth, the seeker magnet M595 does not respond, due to the resistance of the identification device test relay R 2i io X of the call recorder 2ooo X. The relay R2iioX, on the other hand, speaks in series with the magnet M595, and the identification device test relay R330 responds in parallel with the relay R211oX and in series with the magnet M 595.

As soon as the test relay R 33o responds, it closes with contact 334 an interlocking circuit for relay R330 and relay R2iioX that run in parallel to contact 596 of magnet 111595. The relay breaks with contact 332 R 33o a point in the normally closed circuit for relay R 36o the group of time relays; this relay starts because it is dropout delayed, slowly falling off now. It should be noted here that the timing relays R 36o, R350 and R340 are generally in the tightened position and are indicated in this way that they fall one after the other within a predetermined time interval. That : last time relay R340 closes a circuit with contact 341 when it drops out, by which storage is effected in the associated call recorder which shows that the identifier igoo is the identity of a calling number has not been able to determine if the identification is not within the predetermined Time interval has been completed.

Let us now consider the call recorder 2ooo X. When the identifier igoo is assigned to it, the identifier test relay, R2iioX, is actuated in the manner described. When responding, the relay RZiioX closes a circuit (not shown) for actuating the identifier connection relay R igzo X in order to connect all conductors of the call recorder to the identifier igoo. When the identifier connection relay R191oX is actuated, a circuit from earth is closed via the contacts 2o24 X and i922 X, the conductor C igo6 X and the winding of the relay R 56o for individual participants or first party participants to the battery. The mentioned circuit is closed at this time due to the fact that the call originated from the single subscriber TR-3 and due to the fact that the three company relays R2o2oX, R203oX and R204oX of the call recorder 2ooo X are in the dropped position.

When the relay R 56o for individual participants or first company participants is triggered, it closes a circuit with contact 561 via the winding of the control relay R 51o for individual participants or first company participants and the winding of the group control relay R 55o; this relay now works in series. The relay R510 is a multi-contact relay with a large number v of contacts that are closed when the relay is actuated. Only three of the contacts of this relay are shown in the drawing, but up to thirty-five such contacts can be placed on the same relay. If additional contacts are required, additional relays of the same type as the relay RSio can be provided in the actuation circuit. When responding, the relay R 5 io closes a circuit from the battery via contact 562, contact i of the actuated relay R 510, terminal i of the group control terminal block TB5o2, which is connected to terminal ii of the group control terminal block TB 5oi, and then to the winding of the Group relay R2io in the eleven hundred group of identification conductors. The other terminal of the winding of the group relay R2io is connected several times via the hundred resistors Riioo to Ri199 to one electrode each of the gas-filled discharge devices Gioo to G ripp. The battery potential applied to the winding of the group relay R2io via the described circuit is that of the normal office battery with a voltage of around 50 volts, the positive pole of which is grounded. The symbol for the negative terminal of the office battery, as shown at contact 562, is used in the drawings to designate the negative terminal of the 50 volt office battery whose positive terminal is grounded. The same symbol _ is used throughout the drawings to identify the official battery described. .

The above description of the way in which the negative battery voltage is applied to the winding of the group relay R2io of the eleven hundred group of identification conductors applies in essentially the same way to all other hundred groups of identification conductors connected to the subscriber lines of the individual participants and the first company participants of all company managements are connected. All group relays, e.g. B. the group relay R2io, which are connected to all identification conductors of the groups mentioned, are ready at this time to respond in the same way as the group relay R2io: For example, the battery potential is also on the contacts 562, contact 2 of the relay R 5 io and Terminal 2 of the group control terminal block TB 5o2, which is connected to terminal 21 of the hundreds group terminal block TB5oi, routed to the winding of the group relay R 23o of the twenty-one hundred group of identification conductors. The other terminal of the winding of the relay R230 is connected several times via the hundred resistors R 21 oo to R 2199 to one of the electrodes of the gas-filled discharge devices G2ioo to G2i99, which are individually assigned to the hundred identification conductors C2ioo to C2199. -The circuits for the remaining group relays, which are assigned to the hundreds of groups of identification conductors, which correspond to the individual participants or the first participants on company lines, are exactly the same as described.

The group relays that serve the hundreds of groups of identification conductors associated with the identification conductors of the second, third and fourth Society participant are not ready to work.

If the group control relay R550 is in series with the control relay R 5 io for individual participants or first party participants, it sets with contact 551 direct earth potential to the conductor C igoi X, which leads to the call recorder 2ooo X goes. This ground potential is passed on via contact 19I i X of the actuated Identifier connection relay RigioX, contact 2 i i i X of the activated identifier test relay R 2i io X and the winding of the identification / designation relay R i20 after the battery. The response of the relay R i20 indicates to the call recorder 2000X that the identifier igoo is now ready to identify the terminal number of the calling subscriber ascertain. When responding, the relay puts R i20 with its contacts 121 and 122 the positive potential of an additional battery instead of the direct earth potential from 6o volts to the conductor 2125 X.

At this point it should be noted that the direct ground potential is generally applied via the conductor C2125 X and is normally used; in order to keep the call finder 4, 40 X and the line circuit 405 X in the actuated position during the establishment of a connection, in order to mark these units as occupied in relation to other devices that have access to them and in order to mark a ground potential as occupied to the contacts to the line voter bank of all line selectors who have access to the terminals of the calling subscriber line. These circuits go from earth via contact 121, the conductor C2125 X, the marking device 300 X, the conductor C 473 X, the switching arm 458 X of the viewfinder 450 X, the conductor C 5o6 X, the first group selector 50o X, the conductor C 446X , call finder 440 X, switch arm 436 X, conductor C431 X, line circuit 405 X and the C-conductor of the line selector lead in cable 404X to the identifier conductor C2i99 associated with subscriber TR-3 and to the contacts in the Banks of all individual line selectors, e.g. B. the line selector iio who have access to the calling party TR-3. The direct earth potential applied to this circuit marks the calling subscriber as busy to all calls intended for the subscriber TR-3. The direct earth potential applied to the identification conductor C2199 does not cause any actuation of the identifier igoo.

However, as soon as the relay R21o of the call recorder 2ooo X responds and the positive pole of the 6o-volt additional battery 124 via the resistor 123 and contact 122 via the described circuit to the identification conductor C2199, a working potential is created to respond to the gas-filled discharge device of the identifier igoo which is assigned to the calling subscriber TR-3 with terminal number 2199. The current path, via which the potential of the additional battery 124 is applied to the identification conductor assigned to the calling individual subscriber, goes from the positive pole of the 6o-volt additional battery 124 via the resistor 1223, contact 122, the conductor C 2I25 X, which is passed through the identification device 300 X goes to the conductor C473 X , the switch arm 458 X of the viewfinder 450X, the conductor C 5o6 X, the first group selector 500 X, the conductor 446 X, the call finder 440 X, the switch arm 436 X, the conductor C431 X, the Line circuit 405X, the C-conductor of the line selector lead in the cable 404X, the identifier conductor C2 i99 and then through the cable io ooo to the cable 2ooo and to the left electrode of the gas-filled discharge device G2199. The right electrode of the device G2i99 is now connected via the circuit described with the resistor R2199 and the group relay R: 230 of the twenty-one hundred group of identification conductors to the negative terminal of the office battery of about 50 volts. The potential difference at the electrodes of the gas-filled discharge device G 2199 is, therefore, approximately 10 volts, so that the gas-filled discharge device G2199 responds and becomes conductive.

As soon as the gas-filled discharge device G2199 becomes conductive, speaks the group relay R230 and shows the identifier igoo that the terminal number of the calling party TR 3 in the twenty-one hundred group of identification conductors lies. The gas-filled discharge devices used in the identifier igoo are preferably neon discharge tubes.

As soon as the group relay R23o responds, it closes with contact 231 a circuit for the left winding of the group designation relay R235. As soon the circuit described above is closed, the relay R 235 responds and closes a circuit with contact 236 to operate the common group test relay R320 in series with the right winding of the group identification relay R235. This Circuit goes from the negative terminal of the office battery through the right winding of relay R 235, contact 236, conductor C 322, the winding of relay R320 and Contact 333 upon earth. Relay R235 is connected to the circuit described in held in its attracted position, and the common group test relay R 32o works in series with it. When responding, the common group test relay R320 with contact 32i a point in a circuit to be described later in order to to indicate to the call recorder 2ooo X that the identifier igoo is the call number of the calling party has identified TR-3.

As a further consequence of the response of the group label relay R235, it closes its contacts 238 through 243. These contacts are connected to the terminal block TB 244 which is connected to the three groups of the WXYZ label conductors 125, 126 and 127. The WXYZ designation conductors 125 are used to indicate the office number of the calling office code; In the present example this is the number "3" because the calling subscriber is connected to the Florida 3 office. As a result, contacts 243 and 242 of relay R235 are connected to label conductors W and Z of WXYZ label conductors 12.5, corresponding to the number "3" of the specified WXXZ code. The contacts 241 and 24o are connected to the designation conductors W and Y of the WXYZ designation conductors i26 to display the number "2", corresponding to the first or thousands digit of the call number 2i99 of the calling subscriber TR-3. Contacts 239 and 238 are connected to label conductors W and X of WXYZ label conductors 12, 7 to display the digit "i" of the second or hundreds digit of the calling subscriber number.

From what has been said it can be seen that when any subscriber in the twenty-one group calls, the gas-filled discharge device assigned to the calling subscriber in question is made conductive and the group relay R23o is triggered. As a result, the group designation relay R235 will also respond and identify the group - the WXYZ designation conductor 125 and 127 according to the third digit of the code of the calling office and the thousands and hundreds of digits of the four-digit call number of the calling party.

The identifier igoo, which, as mentioned, is part of the digits the calling subscriber number, the remaining two digits must now determine which belong to the call number of the calling party. As soon as that Group designation relay R235 responds, it therefore closes one with contact 237 Circuit for actuating the common group connection relay R245. This is shown as a relay with a hundred contacts to be closed oo to 99, it goes without saying, however, that instead of the individual relay R: 245, for example ten relays with ten contacts each or four relays with twenty-five contacts each can be used, which can be operated at the same time, for a total of one hundred Close contacts. When responding, the relay R245 connects over its hundred Normally open contacts the hundred identification conductors C2ioo to C2199 with the hundred tens-and-units marking relays R oo to R 99. Of these hundred relays only two are shown, namely the Relays R oo and Rgg; the remaining ninety-eight relays are essentially in the similarly connected to the respective ninety-eight identifier conductors. It will also be understood that each of the tens and ones designating relays have contacts which are closed when it is actuated to the WXYZ designation ladder 128 and 129 correspond to the tens and units of the associated participant to call. It is further understood that each of the hundred tens-and-units designation relays R oo to R gg via the conductors C oo to C99 with the corresponding contacts of a each of the common group connection relays, e.g. B. of relay R245 is associated with each of the hundreds groups of identifier conductors. Through this the hundred tens-and-unit designation relays can individually match the hundred identification conductors be assigned to each of the hundreds groups of each hundred identification conductors.

As soon as the hundred tens-and-units designation relays Roo to Rgg connected to the hundred identification conductors Caioo to C2199, which is indicated by the Actuation of the common group connection relay R 245 happens, this becomes positive Potential of the 6o volt additional battery i24, that with the identification conductors C: 199 is connected, now via the contacts 99 of the relay R245 and the conductor C 99 to forwarded to the winding of the tens-and-units designation relay Rgg and from there via the winding of the common group relay R310 to the negative terminal of the 5ö volt official battery. As soon as this circuit is closed, the tens-and-units designation relay speak Rgg and the common group relay R31o on. When responding, relay R connects gg ground potential to the Y-conductor of the WXYZ-designation conductor 128 to make them match to be marked with the tens digit »9« of the numerical part of the calling number 2199, and it also applies ground potential to the Y conductor of the WXYZ designation conductor 129, to match this with the number "9" of the one part of the number 2i99 of the calling subscriber to identify TR-3.

Let's look at the 2oooX call recorder again. When the WXYZ designation ladder 125 to i29 are designated in code form corresponding to the numbers 32199, speak the relays of the memory lFXYZ i to WXYZ5 in a known manner via the actuated Contacts 19I4X to 1921 X of the RigioX relay and remain in the energized position Position to store the said five digits until they are identified by the identifier 3oo X on the assigned. Slip repeater 230o X are transmitted.

If the common group relay R31o of the identifier igoo is operated in series with the tens-and-units designation relay Rgg, it closes a circuit with contact 311 to operate the identification-finished relay R2i2oX of the call recorder 2ooo X. This circuit is connected to earth contacts 311 and 321, the conductor C igo4X going to the call recorder 2oooX, contact igi2X and the winding of the relay R2i2oX to the battery. The actuation of the relay R 212o X indicates to the call recorder 2oooX that the identifier igoo has worked according to the call number of the calling subscriber TR-3 and that it can be released by the call recorder 2oooX and made available for other call recorders. When responding, the relay R2i2oX controls the (not shown) identification starter relay of the call recorder 2ooo X, which in turn switches off the starter ground potential of the conductor C 1903 X, the Identifier-Prüfre @ lais R 2i io X from the conductor C igo2 X and places a direct earth potential on the Cigo2X conductor. If the identifier test relay R2iIoX is disconnected from the conductor C igo2X, it drops out and opens a point in the circuit (not shown) for the identifier connection relay RigioX, which now also drops out. When it drops out, the RigioX relay opens its contacts igi i X to 1925 X and therefore switches off the various conductors of the identifier igoo from the call recorder 2ooo X. As a further consequence of the dropping of the relay R2 11oX it opens with contact 2i ii X a point in the circuit of the identification designation relay R i2o, which drops out, disconnects the positive terminal of the 6o-volt auxiliary battery 124 from the circuit described with the identification conductor C2199 and in its place creates direct busy earth, which keeps the various voters and relays in the energized position and marks the calling line at the terminals of the group voter bank of all group voters who have access to it as busy.

In the identifier igoo, the starting relay R 37o drops out as soon as the starting earth is switched off by the call recorder 2ooo X from the conductor C 1903 X. When it drops out, the relay R 370 opens its contacts 371 and 372 and disconnects the identifier test relay R330 from the circuit of the winding of the finder magnet M595; it also switches off the circuit of the holding conductor C igo2 X from the seeker magnet M595. Identification device test relay R330 now drops out and, with contact 334, opens another point in its hold circuit.

It should be mentioned here that the application of the direct ground potential in place of the resistance to the earth conductor C igo2 X the Anrufaufzeichner 2ooo X Anrufaufzeichner the searcher 598 against characterizes as a non-calling Anrufaufzeichner. In other words, if the starting relay R 370 is held in the attracted position at the time the identifier igoo is switched off from the call recorder 2ooo X by another caller, the caller-finder 598 will automatically switch its switching arm to the identifier igoo of another calling party Assign call recorder. When the relay R370 is activated, the direct earth applied to the conductor C igo2X is connected to the winding of the finder magnet M595 via the switching arm 597 and the contacts 372 and 596. In parallel to this, the direct earth of the Cigo2X conductor is also connected via the switching arm 597 and the contacts 372 and 371 to the winding of the relay R330, the other end of which is also earthed. The tag test relay R330 is therefore short-circuited and drops out; it opens its locking circuit with contact 334. The seeker magnet M 595 responds when the circuit described is closed, and then interrupts the circuits with contact 596, so that the magnet is de-energized and the switching arm 597 advances to the next contact on its contact bank. If the call recorder belonging to the next contact does not need the identifier igoo, the switching arm 597 again encounters direct earth potential, so that the mode of operation is repeated. In this way, the magnet 142595 advances the switch arm 597 until it encounters a bank contact connected to a call recorder which requires the identifier igoo.

From the above description of the operation of the starter relay R37o, the identification test relay R330 and the call recorder finder 598 it can be seen that the relays R 370 and R 33o drop out and the call recorder finder 598 its switching arm 597 in engagement with the holding conductor C igo2 X of the call recorder 2ooo X holds if at the time of switching off the identifier igoo from the call recorder 2ooo X no other call recorder needs the identifier igoo. If, on the other hand, at the time the identifier igoo is switched off from the call recorder 2ooo X, another call recorder needs the identifier, the test relay R330 drops out and the starting relay R 370 is kept in the energized position by the call recorder, which requires the identifier igoo. In the latter case, the magnet M 595 of the call recorder finder 598 automatically advances the switching arm 597 in a clockwise direction until it touches the contact of a holding conductor belonging to the call recorder requiring the identifier igoo.

If the identifier test relay R330 is described in the Way, it opens with contact 331 a point in a circuit across the Head C igo5 X to indicate that the identifier is the calling number of the calling party Participant has not determined. However, the latter circuit cannot are closed before the timing relay R360; R350 and R340 slowly in the described Sequence have dropped out before the test relay R330 dropped out. As another When relay R330 drops out, it closes a circuit with contact 332 to actuate the timing relay R 36o, which in turn actuates the timing relay R350 and R 34o causes. Finally, the relay R 33o also interrupts when it drops out Contact 333 creates a point in the interlock circuit for the common group test relay R320 and the right winding of the group identification relay R235. These relays drop then off and interrupt various other circuits, which are described below will.

With regard to the call recorder 2oooX, it should be remembered that the failure of the identifier test relay R 2i io X caused the identifier connection relay R 191o X to drop out and the identifier igoo switched off from the call recorder 2ooo X, as described, and that the identification Designation relay R 212o dropped out and put a direct earth potential in place of the positive pole of the 6o-volt auxiliary battery 124 on the identification lines C2199. As soon as the identification igoo is switched off from the call recording 2ooo X, the earth potential applied to the conductor C 19o6 X is switched off by contact 1922 X and causes the relay R 56o to drop out for individual subscribers and first company subscribers of the identifier igoo. When it drops out, relay R 56o with contact 561 interrupts the circuit for relays R510 and R55 o, which now drop out. With contact 562 the relay R 56o also switches off the negative potential of the office battery from all contacts of the control relay R 51o for individual participants and first party participants. The shutdown of the negative potential of the official battery from these contacts happens at about the same time as the positive pole of the 6o-volt additional battery 12q. is turned off by the identifier conductor C: 2199. Switching off the negative pole of the office battery at the contact of the relay R 5 1o opens the circuit for the group relay R230, which is assigned to the twenty-one hundred group of identification conductors, and it also switches off the negative pole of the office battery from all other group relays that are the identification conductors both the individual participant and the first social participant are assigned. At this time, the positive terminal of the 60 volt auxiliary battery 124 from the left electrode of the gas-filled discharge device G2199 is switched off and a direct ground potential is applied to it. The right electrode of the gas-filled discharge device G 2199 has no potential because the negative terminal of the 50-volt official battery was switched off by opening contact 562. The gas-filled discharge device G2199 therefore becomes non-conductive again and the group relay R? -30 drops out. When it drops out, the group relay relay R230 with contact 231 interrupts the circuit for the left winding of the group marker relay R235. Since the circuit for the right winding of relay R235 is also interrupted in the manner described, relay R235 drops out and interrupts the various Sirom circuits with contacts 236 to 243. Contact 236 of relay 235 interrupts another point of the holding circuit described for the right one Winding of the relay, and the contacts 238 through 243 switch off the designation ground potential from the WXYZ designation conductors 125-127. Finally, the relay R2-5 with contact 237 interrupts the circuit for the common group connection relay R245, which also drops out.

Before describing the effects of switching off the relay R245 result, the possible short-term electrical circuits are described first, during the period between the dropping out of the relay R: 230 and the dropping out of relay R: 245 can result. Sawn more precisely, the identification conductors, e.g. B. the Heads C2roo and C: 2199, those with manned subscriber lines of the twenty-one hundred group connected have ground potential, and the free subscriber lines have that negative potential of the 5o-volt official battery, which is generated via the winding of the (not shown) Cut-off relays in the line circuits of the associated subscriber lines she is laid. As these conductors to the left electrodes of the gas-filled discharge devices. G2roo to G2199 can go between the electrodes of two or more of the gas-filled Discharge devices occur a potential difference of about 5o volts. However, since the right electrodes of these devices through the resistors, e.g. B. the resistors R2roo to R2199, are connected together and each resistor is about 2700o ohms has, the voltage between any of the two electrodes is insufficient to produce a To cause discharge and to make it conductive. In addition, this can be applied to the various Identification conductor C2roo to C2199 applied earth potential or the resistance earth, as I said, via the contacts of the common group connection relay R 245, the corresponding tens-and-units designation relays connected in parallel and the Winding of the identification completed relay R3ro connected to the battery. will. The tens-and-units designation relays Roo through R.99 and the relay R310, however are limiting relays and are calculated in such a way that they do not respond at 5o volts. These However, as mentioned, relays respond when the 6o volt auxiliary battery and the 5o-volt official battery can be connected in series. that the various relays and apparatuses of the circuit are used to identify the Call number of a calling subscriber line arranged in a special way and are set up so that they are connected to the normal 5o-volt public battery do not address in an undesirable manner.

When the common group connection relay R245 drops out in the manner described, it separates the hundred tens-and-units designation relays R oo to R 99 from the hundred identifier conductors C 2roo to C: 2199. The switched on tens-and-units designation relay R99 drops out; the identification completed relay R310 also drops out. With contact 311 the relay R 310 opens another point of the identification-ended circuit with the conductor C i9O4X. At this time, all of the actuated relays of the identifier igoo have dropped out, except for the timing relays R 36o, R350 and R340, which are generally held in the energized position. The identification igoo is now fully released and is available to the call recorder part of other identification devices of the system: From the above explanation of the operation of the identifier igoo it can be seen that it was directionally controlled by the third digit of the code of the calling office and the four digits of the To store the call number of the calling subscriber in the call recording 2ooo X as soon as the positive pole of the 6o-volt additional battery is connected to the identification conductor, which is assigned to the calling subscriber TR-3 with the call number FLorida 3-2199. In the above description of the operation of the identifier igoo it was pointed out that the timing relays R 36o, R350 and R340 are normally in the activated position. After the identifier igoo was assigned to the call recorder 2ooo X, the identification device test relay R 33o spoke, as you can remember, and with contact 332 interrupted the circuit for the first timing relay R36o, which slowly dropped out. At the time the test relay R 330 responded, the call recorder 2000X was also controlled so that the positive terminal of the 60 volt auxiliary battery 124 was connected to the. Identification conductor C 2i99 of the calling party TR-3 was placed. The application of the auxiliary battery potential to the identifier conductor C2i99 first caused the gas-filled discharge device G-2199 to discharge, and this in turn caused the relays R230, R235, R245 and R32o to be actuated sequentially. As mentioned, the relay R235 stored the third digit and the thousands and hundreds of the call number of the calling subscriber in the call recorder 2000X. As a result of the actuation of the relay R245, the identifier igoo was then controlled in such a way that it actuated the tens-and-units designation relay Rgg, and in series therewith the identification-terminated relay R31o. The relay Rgg stored the tens and one of the call number of the calling subscriber in the call recorder 2ooo X. The response time of the various relays is extremely short; therefore the time span for the identification, ie calculated from the time when the identifier was occupied by the actuation of the relay R33o to the completion of the identification, which is indicated by the actuation of the relay R31o, is considerably shorter than the drop-out time of the three timing relays R 36o, R350 and R340. From what has been said it can be seen that the normal work of the identifier igoo for storing the calling number of a calling subscriber has ended long before the three mentioned time relays drop out. However, if for any reason the storage of the number of the calling subscriber has not ended, the identification-finished relay R31o is not actuated and the identifier 190o is not switched off by the call recorder 2oooX.

If the slowly falling timing relay R 36o drops out after the identifier igoo has been assigned, it interrupts the circuit of the timing relay R 350 with contact 361, which also slowly drops out. If the timing relay R350 drops out, it opens the circuit of the timing relay R340 with contact 351, which in turn slowly drops out and, with contact 341, applies ground potential to the identification incomplete conductor C 1905 X. However, if the relay R340 drops out before the identifier igoo was switched off by a call recorder 2ooo X because it was unable to save the number of a calling subscriber, the mentioned earth potential is applied to the conductor C 19o5 X and thereby causes the Identifier fault relay R213oX of the call recorder 2oooX. When responding, the relay R 213o X stores the fact that the identifier igoo was unable to determine the identity of the calling subscriber, and it automatically switches off the identifier igoo from the call recorder 2ooo X in order to free the identifier igoo for other call recorders close. Each of the actuated relays of the identifier igoo drops out, and the call recorder searcher 598 operates in the manner described to assign the identifier igoo to a different calling call recorder. As a further consequence of the disconnection of the identifier igoo from the call recorder 2oooX, the timing relays R 36o, R350 and R340 are actuated again in the manner described in order to initiate a new time period as a result of the assignment of the identifier igoo to another call recorder.

As a further consequence of the response of the identifier fault relay R213oX, the call recorder 2ooo X, the identifier 300X and the slip repeater 2300X are actuated in order to establish a connection from the calling subscriber via the call searcher 440X, the first group selector 50o X and the repeater 230o X to a supervisor .

From the above explanation of the operation of the identifier igoo for determining the number of the calling subscriber TR-3 of the Florida office 3, whose terminal number is 2199, it can be seen that the identifier igoo works in essentially the same way to identify the number of each calling subscriber Florida 3 Office to determine and save. For example, the identifier igoo can determine the phone numbers of the calling company subscribers TS1-3, TS2-3, TS3-3 or TS4-3 who are connected to the company line with the conductors 12o and 121 and whose phone numbers are 1199, 1299, 1399 and 1499 . When the calling company subscriber TS4-3 makes a chargeable call in the manner described, the identification device 300 X comes into action and establishes a connection in cooperation with the transmitter 1300X and the call recorder 2ooo X. When the call facility of the subscriber TS4-3 is actuated to store the number of the called subscriber in the identification device 300X , the cam disk 183 of the subscriber is actuated and transmits three earth pulses over the calling line, whereby the company relays R 202o X, R: 2030 X and R 2.040 X for the second, third and fourth company subscribers, indicating that the calling party is the fourth station of the calling company line.

Shortly after storing the code part of the called office, i.e. the first part of the called subscriber number, the identifier igoo is assigned to the call recorder 2ooo X in the manner described, which is done by actuating the identifier connection relay R191oX. At this time, a circuit for actuating the relay R 5g0 for fourth company subscribers in the identifier igoo is closed to indicate that the identification potential of the calling party is to be found in one of the groups of one hundred identification conductors which is only connected to fourth company subscribers on company lines . The circuit for actuating the relay R590 for the fourth participant in the company goes from earth via the contacts 2o23 X, 2033X 2042X and i925 X, the conductor C 190g X and the winding of the relay R 590 to the battery. When responding, the relay R 590 with contact 591 closes a circuit to operate the control relay R 540 for fourth company participants and the group control relay R550 in series. As a further consequence of the response of the relay R 590 , it connects with contact 592 the negative pole of the 5o-volt official battery with all contacts of the control relay R540 for fourth company participants, and when this relay has responded, as described, it switches the negative pole of the 5o volt public battery to the various terminals of the group control terminal block TB 5o2. The upper contact of the relay R540 is connected to the terminal 121 of the terminal block TB 502 and connected to the terminal 14 of the hundred group terminal block TB5oi. This terminal in turn is connected to the winding of the group relay R450, which is common to the hundred gas-filled discharge devices G 140o to G 1499 of the fourteen hundred group of fourth participants. The other contacts of control relay R540 for fourth company participant are connected to terminal blocks TB501 and TB502 in a similar manner to all other group relays, e.g. B. to relay R450 associated with the identification conductors associated with fourth party members in other hundreds of lines.

From the above description of the identifier igöo it can be seen that it identifies the call number of only fourth company subscribers when the relays R 5g0 and R540 for fourth company subscribers are actuated. In the event that the relays R 57o and R 52o for second company participants or the relays R 58o and R530 for third company participants are operated, it would identify a participant number for second and third company participants in essentially the same way.

As a further result of the assignment of the identifier igoo to the call recorder 2ooo X, the positive terminal of the 6o-volt additional battery 124 is switched through to the switching arm 426 X of the caller 440 X via the circuit described and from there via the conductor C 103 to the line circuit 1o2 and the C-wire of the group selector leads in cable 404 connected to each of the four identification conductors C 1199, C i2993, C1399 and C 1499 belonging to the four subscribers of the calling company line. The four named identification conductors are connected to the eleven hundred group, the twelve hundred group, the thirteen hundred group and the fourteen hundred group of the relays in the identifier igoo, as shown in FIGS. The positive terminal of the 6o volt auxiliary battery 12q. is therefore connected to the gas-filled discharge devices G 11g9, G i299, G1399 and G1499 of the hundreds group in question. However, since the negative terminal of the 5o-volt official battery is not connected to the windings of the group relays R210, R250 and R41o of the eleven hundred group, the twelve hundred group and the thirteen hundred group, connecting the additional battery to these hundred groups has no consequences. and there is no identification.

In the fourteen hundred group of identification conductors, the negative terminal of the 50 volt public battery was connected through the winding of the group relay R450 to resistors R1499 through R1400 arranged in parallel. The application of the positive potential of the 6o-volt auxiliary battery 124 to the identification conductor C 1499 causes the gas-filled discharge device G1499 to discharge and thus closes the circuit for the group relay R45o. The relay R45o activates the group designation relay R455 with contact 451; this in turn saves the third digit "3", the thousand digit "1" and the hundred digit "4" in code form in the memories WXYZ 1 to WXYZ4 of the F'Anrufaufrecorder 2ooo X in the manner described. With contact 456 the group identification relay R455 closes a holding circuit in series with the common group test relay R3: 20, which also responds. Finally, the relay R455 with contact 457 closes an actuating circuit for the common group control relay R465, which, when responding, connects the hundred tens and units designation relays Roo to Rgg with the hundred identification conductors C 140o to C1499. The remaining operations of the identifier igoo are essentially the same as described earlier; It goes without saying that the tens-and-units designation relay R 9g works in series with the identification-terminated relay R31o to thereby place the tens digit "9" and the units digit "g" in the memories WXYZ4 and WXYZ5 of the call recorder 2ooo X to store and cause the call recorder 2ooo X to switch off the identifier igoo.

From the foregoing, it can be seen that the identifier rgoo denotes the has stored third digit "3" which identifies the Florida 3 calling office number, also the numerical part of the calling subscriber's number 1499 The following actuation of the Zooo X call recorder, the tagging device 300 X and the slip repeater 2300 X for the production of perforated strips with the various data of the connection including the Phone number of the calling party is the same as already described.

How the group selector works In the description above the way of working it was pointed out that the calling subscriber line in the contact banks of the various line selectors who have access to it the application of earth potential to the C-conductor is marked as occupied, the belongs to the calling line, e.g. B. to the C-conductor in the Kabe14oi of the line selector. If the call number of the calling subscriber is determined by the identifier igoo is to be, the occupied earth placed on the said conductor is switched off by him and replaced by the positive potential of the 60 volt auxiliary battery 124. After completion the identification by the identifier igoo becomes the direct earth potential put back on the C-conductor, which is assigned to the calling line, and the Auxiliary battery is switched off.

If another subscriber in the system makes a call to a called line via the local switching path, including the second group selector 315 X, the third group selector 320 X and the line selector iii, while it is marked as busy by direct ground potential, then the line selector iii operates, which a line selector according to FIG. 48 of the book by Kempster B. M i 11 he can be, in a known manner, ur._ to give the calling subscriber a busy signal. These line selectors work perfectly satisfactorily in checking a busy, called line; However, it has been found that, during the busy test, a direct ground potential is briefly applied to the C-switch arm of the line selector, while the holding circuit for its busy relay is closed. This busy circuit keeps the busy relay of the line selector in the activated position and therefore prevents the establishment of a voice connection with the busy, called line by the line selector.

From the above brief description of the busy checking of a Line selector of the known type shows that the line selector briefly has ground potential to his C-switch arm, while the occupancy relay is switched off by the C-switch arm and connected to a local interlock ground potential. If the positive Pole of the 6o volt auxiliary battery 124 during this brief period for the purpose of Identification to the C-conductor and the associated identification conductor of the occupied Line is placed, it is created briefly by the calling line selector direct ground potential short-circuit the auxiliary battery and therefore the identification disturb the identifier igoo. In addition, the can be sent to the identification conductor Put a direct short circuit through the protective fuse and in this way disconnect the positive potential of the 6o volt auxiliary battery from the identification conductor. The identifier igoo could then no longer work.

About incorrect operation of the identifier igoo and short-circuiting To prevent the auxiliary battery used for identification, the holding circuit became designed for a line selector busy relay in such a way that it contains an impedance, which is used by the upper winding of the occupancy relay R73o. Another change of the holding circuit of the occupancy relay is shown in Fig.8, where a resistor 814 is placed between contacts 813 and 832. If this resistor 814 is omitted, so the line selector of FIG. 8 corresponds exactly to the known line selector.

Let us now consider FIG. 7. It is assumed that a calling subscriber from the Florida office 3 has established a connection to the line selector 7oo of FIG. 7 via the local switching path including the second group selector 315X and the third group selector 320X. The line selector 700 responds to the penultimate digit of the called number in the known manner and raises its switching arms 75o to 752 to the level of the associated bank contact, which corresponds to the numerical value of the received digit. The last digit of the called number then controls the line selector 700 in the known manner such that its switching arms pivot in the selected height and come into engagement with the bank contacts which are connected to the called line. In the present example it is assumed that the switching arms 75o to 752 have been brought into engagement with the bank contacts of the negative line, the positive line and the C line of the cable 401, which the company management with the company participants TSi-3, TS2-3, TS3- 3 and TS4-3 is assigned. It is also assumed that one of the company participants is just about to establish a connection, and that the positive pole of the 6o-volt auxiliary battery 124 is connected to the C-conductor of the cable 401 in order to operate the identifier igoo and the telephone number of the to save the calling company participant.

While the last digit "g" of the called subscriber number is being received, the rotary relay R71o of the line selector 70o is in the activated position, and when the switching arm 750 touches the bank contact of the C-conductor, which is connected to the auxiliary battery, the relay R710 connects as a result of it slowly decreasing characteristic the lower winding of the occupying relay R730 with the switching arm 75o. The positive pole of the 6o volt additional battery 12q., Which is connected to the C conductor of the cable 401 and to the identification conductor C i199, is connected to the switch arm 75o, the contacts 712 and 721 and the lower winding of the occupancy relay R730 connected to the negative pole of the 5o-volt official battery. The relay R73o works immediately when this circuit is closed and, with contact 732, prepares a position for the holding circuit of the occupying relay R 730, which is in the energized position. The operations described also take place when the switching arm 75o meets occupied earth.

Shortly after the line selector has received the last pulse of the last digit »9«, the rotary relay R7io slowly drops out. During the fall, the contacts 7r2 and 713 are closed for a short time: During this period, a line selector applies a direct earth potential to the C switch arm 750 and therefore directly short-circuits the 6o-volt additional battery z24. This direct short circuit can, under certain circumstances, hinder the normal operation of the identifier to determine the call number of the calling company subscriber on a company line, as described, and it can paralyze the operation of the identifier igoo by blowing the protective fuse of the additional battery z24.

In the modified circuit of a line selector according to FIG. 7, the hold or release relay R740 is in the attracted position the entire time the line selector is operated. The ground at contact 741 is connected via the upper winding of the actuated busy relay R730, and via contacts 732, 713 and 721 and the lower winding of the relay R730 to the negative terminal of the office battery. In this circuit, the upper winding of relay R730 is fed in series with the lower winding to complete a holding circuit and keep the occupancy relay in the energized position. A branch of this circuit, which runs over the upper winding of the relay R730, is also connected to the C-conductor of the cable 401 via the contacts 713 and 7122 and the switching arm 750. Since this circuit contains the impedance of the upper winding of the relay R 75o, the possibility of a short circuit of the auxiliary battery r24 is excluded. The impedance of the upper winding of the relay R730 also prevents the line selector of FIG. 7 from interfering with the normal operation of the identifier igoo in determining the telephone number of a calling company subscriber.

As soon as the rotary relay R710 is in its normal, dropped position returns, the impedance of the upper - winding of the relay R730 becomes through contacts 712 disconnected from the C-switch arm 75o. The occupancy relay R730 transmits the Speaking the familiar busy tone to the subscriber who tried to establish a connection to establish with an occupied participant of a company management.

Looking at the line selector 8oo of FIG. 8 it can be seen that its busy test circuit essentially identical to that of the line selector 7oo of Figure 2; except that the occupancy relay R 83o on. Relay with a simple Winding is, and that the protective arrangement to prevent short-term application a direct ground potential to the C-switch arm 85o takes the form of a resistor 814, which is in the branch of the circuit between contacts 832 and 813 is laid. The operation of the line selector 8oo is exactly the same as that of line selector 7oo of FIG. 7, except that resistor 814 is in the hold circuit for the occupancy relay R830 instead of representing a winding of the occupancy relay.

The modified embodiment according to FIG. 8 has certain advantages in that than it: can be used for every existing line selector without that the simple winding of the occupying relay R 83o is removed and replaced by a double Winding must be replaced as in relay R73o in FIG. 7. So it is only necessary insert the resistor 8r4 in the branch of the circuit, which the contacts 813 and 832 connects.

The modified busy test circuits of Figures 7 and 8 have been incorporated into Connection with an identifier described by the application of the positive Potential of an additional battery to the identification conductor of a calling subscriber line is working; it goes without saying that this line voter also at. Identification arrangements Can be used; where tone characters are used. to the phone number identify the calling party.

From what has been said it appears that a telephone system was created which one. Contains identifier which is the telephone number of a calling party identified and which contains a new and improved circuit that is a gas-filled 2-electrode discharge device, which by means of the positive potential directionally controlled by a 6o-volt auxiliary battery, which is sent to the identification conductor of the participant to be identified is placed. From what has been said it also follows that that a new and improved busy checking circuit for line selectors created who have access to the lines to be identified, and that this busy test circuit prevents impairment of identification.

Claims (17)

PATENT CLAIMS: i. Line identification circuit for a telephone system; whose subscriber lines have multi-digit designations, characterized by a single gas-filled electronic device (Gzi99) which is assigned to the subscriber line (4oi X) and which has two electrodes, the first of which is connected to this line (4oi X), via which means (R i2o , R510), which respond to an incoming call via this line, in order to make the gas-filled device (GZi99) conductive between the electrodes, and whose second electrode is connected to control means (R230, R235, R99, R310) which depending on the conductivity of this device (GZi99) can be operated to first operate a multi-digit memory (WXYZi to WXYZS) so that it stores part of the digits of the multi-digit designation of this calling line, and then to operate this memory so, that it stores the remainder of the digits of the multi-digit designation of this calling line. 2. Line identification circuit according to claim i, characterized in that the following control means are provided: first control means (R230, R235) which are assigned to said second electrode and are actuated as a function of the conductivity of this device (G.2199), and additional control means (R: 245, R 9g, R310) which are connected to the first electrode and respond as a function of the actuation of the first control means (R.230, R: 235). 3. Line identification circuit according to claim i or 2, characterized by a first current source (R 12q.) and a second current source, by the means mentioned (R i20, R510) for making the gas-filled conductive Device (G2igg) can be connected in series. q .. Line identification circle according to claim 3, characterized in that as current sources. an additional battery (R 12q.) And the official battery is used. 5. Line identification circle according to one of the preceding claims, characterized in that it is with a A plurality of subscriber lines is connected, each of which is one of the gas-filled Discharge devices (Giroo to G2ig9) is assigned, while the memory (WXYZi to WXYZ5) is common to all of these lines. 6. Line identification circle according to any one of claims 2 to 5, characterized in that said first Control means include a relay (R230). 7. Line identification circuit according to one of the preceding claims, characterized in that a resistor (R 210o to R2199) is connected between each of these devices (G21oo to G2199) and a relay (R 230) common to these control devices. B. Telephone system with line identification circuits according to any one of claims i to 7 as well as with a group of lines, each associated with a multi-digit number, characterized by an identifier (igoo) having a single Identifizierleiter for each of these lines (CYroo to C2199, ETC.) with a single, gas-filled 2-element discharge device (G2roo to G2199 etc.) which is made conductive between these two elements by applying a potential to their identification conductor when a call comes in on one of these lines, further characterized in that a relay (R2,30) is connected to one of the elements of all these discharge devices (G2roo to G2199 etc.) and, depending on the conductivity between the two elements, one of these devices is actuated to provide means (R235) for designating a first group of designation conductors ( I25 to 127) in accordance with certain digits of the multi-digit Number of the calling line, and to control other designation control means (Roo to R99) associated with each of the lines to associate each of these designation control means (Roo to R99) with the identification conductor (C2roo to C2199 etc.) which corresponds to the associated line, in order to thereby actuate only that single one of these designation control means (R oo to R gg) which is connected to the identification conductor which has received the potential to create a second group of designation conductors (128, 129 ) in accordance with the remaining digits of the multi-digit name of the calling line. G. Telephone system according to claim 8, characterized by memory means (WXYZ i to WXYZ5) operated in accordance with the designations of said first group and said second group of designation conductors (125 to 129) for storing the multi-digit number of the calling line. 1o. Telephone system according to Claim 8 or 9, characterized in that this designation means are embodied by a second relay (R235). i i. Telephone system according to claim r o, characterized by means (R 33o to R370) which controlled depending on the actuation of this second relay (R235), to release the identifier (igoo). 12. Telephone system according to one of the claims 8 to i i, thereby. characterized in that the identifier (igoo) has a plurality of the named management groups. assigned. 13. Telephone system according to claim 12, characterized in that the identifier (igoo) forms part of an office, which includes: voter devices, a plurality of memory transmitters, means to assign a free memory transmitter to a calling line and to Actuation of this memory transmitter in accordance with a called number, and means in said memory transmitter for controlling said selector means and establish a connection in accordance with the called number. 1q .. Telephone system according to one of the. Claims 8 to 13, characterized by a time-controlled device (R 3q.0 to R 36o) with a predetermined fixed time sequence and with means (R370, R330) for starting this time sequence depending on the assignment of the said identifier to the memory transmitter and for switching off of the identifier from your memory transmitter in order to make the identifier available for use by another memory transmitter - either in dependence on the actuation of the individual identification relay or by the said time-controlled device at the end of the fixed time lapse. 1 5. Telephone system according to one of claims 8 to 1q., Characterized in that each of a plurality of subscribers (TS i to TSq.) Of a common company line (i20, 121) is assigned one of said identification conductors. 16. Telephone system according to claim 13, 1q. or 15, characterized by a line selector (700, 80o) capable of is to establish a connection to the line to be called (q.oi), whereby this individual identification wire (C rigg) several times with one accessible to the line selector Terminal is connected and means are provided which, depending on the actuation of the dialer operating to establish a connection from the calling line and a first busy designation potential on said identifier conductor (Ciigg) and operate the line selector to connect the terminal of this identification conductor to be occupied, whereby this line selector has an occupancy relay (R730, R83o), which is actuated when this identification conductor either with the mentioned, busy designation potential or is marked with the named identification potential in order to transmit a signal, which indicates that this line is busy, further identified by a Holding circuit for this occupancy relay, means for connecting this holding circuit with the identification conductor and the occupancy relay, and means in this circuit, in order to prevent the potential of the holding circuit from being affected by the Identifying conductor placed potential is impaired. 17. Telephone system after Claim 16, characterized in that the occupancy relay (R730) has two windings has and in the event that the identification conductor for the purpose of transmitting the busy signal either with the busy designation potential or with the identification potential is designated, is operated via a circuit which one of these windings includes, wherein means are provided to the interlocking potential with the identification conductor and to connect the occupancy relay so that the other winding of the occupancy relay prevents the locking potential from being applied to the identification conductor To impair identification potential.