US2283395A

US2283395A - Telephone system

Info

Publication number: US2283395A
Application number: US363729A
Authority: US
Inventors: Walter B Strickler
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1940-10-31
Filing date: 1940-10-31
Publication date: 1942-05-19
Anticipated expiration: 1959-05-19
Also published as: GB654096A; FR961975A; NL69989C

Description

ay 1942- w. B. STRICKLER 2,283,395

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet l FIG. 7

F/GJA FIG. 44

F/GZ F/GJ FIG. 4 F/a's FIG.

FIG.

A T Tom/Er DIS TAN 1' OFFICE May 19, 1942.

w. B. STRICKLER 2,283,395

TELE'HONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet 2 /Nl/E N TOR 8y we. 5 TR/C/(LER A T TORNEV y w. B. sTRlcKLi-zR 2,283,395

TELEPHONE SYSTEM Filed Oct. 51, 19 40. 8 Sheets-Sheet 3 INVENTOR W8. STR/C/(LER A TTOR/VEV May 19, 1942. w. B. STRICKLER 2,283,395"

TELEPHONE SYSTEM Filed ot. 51,1940 8 Sheets-Sheet4 M/l/EN TOR W. B. S TR/CKLER v MSE'YMTW -A TTORNEV y I W. B. STRICKLER 2,283,395

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Slaget 5 A r TOPNEV May 19, 1942.

w. B. STRICKLER. 2,283,395

TELEPHONE SYSTEM Filed Oct. 51, 1940 8 Sheets-Sheet 6 w ENTOR 6y WBSTR/C/(LER NEW 1f A T TORNEV May 19, 1942- w. B. sTRicKLER TELEPHONE SYSTEM 8 Sheets-Sheet 7 Filed Oct 51, 1940 I/Vl/E N TOR we. STR/C/(L ER A Tram/5r w. B. STRICKLER May 19;, 1942.

TELEPHONE SYSTEM Filed Oct. 31, 1940 8 Sheets-Sheet 8 mob mm. P3 N v v b NQb A T roRA/Ei Patented May 19, 1942 i TELEPHONE SYSTEM Walter B. Strickler, East Orange, N. J., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application October 31,

V Claims.

This invention relates to telephone systemsand more particularly to registering devices for automatic switching telephone ofiices.

The object of the invention is to simplify the registering system in an automatic telephone ofiice which receives widely varying designation registrations.

A'feature of the invention is a system of form ing different combinations of a plurality of vari ably operable code registers in a-registering device depending upon the number of digits in a code responsive to code digit pulses and in connecting the registers which are formed into the digit registering combination with the registers of a second registering device.

Another and related feature of the invention.

is a system of forming different combinations of said variably operable code registers responsive to the digits comprising the code and in operating a device cooperatively related to the combination formed for connecting the registers so combined with the registers of a second registering device. r r

Another and related feature of the invention is a system of forming different combinations of said variably operable registers responsive topulses and in providing other devices selectively operable responsive to the registers formed into a code registering combination for connecting the code registering combination-so formed to the registers of a second registering device.

Another and related feature of the invention is a system of forming different combinations of said variably operable registers depending upon the number of digits in' a code'for controlling I the operation of a second registering device to select different groups of trunks for association with the registers of said second registering dc vice.

Another and related feature of the invention is a system of registering digits in a registering, device having a series of registers and a circuitfor transferring a pulsing device to successive registers, in which said series of registers may be variably formed into combinations using different numbers of said registers for a first code, in transferring said first code registrations to a second registering device and in registering another code on the next in order registers of said series following the last register formed into the combination, and in transferring said second digit registrations to a third registering device.

These and other features will be discussed more fully in the following description.

To illustrate the features of the invention reiincoming sender.

1940, Serial No. 363,729

erence may be had to the accompanying draw ings in which:

Fig. 1 illustrates an office having a pulsing circuit therein, an incoming trunk circuit, a sender link and connector, and a portion of an Figs. 2, 3, 3A, 4, {1A and 5 illustrate'the remainder of the sender to which the invention applies. Fig. 3 also diagrammatically illustrates a third sender and an outgoing pulse control circuit.

Fig. 6 illustrates a marker having code registers associated with different groups of trunks and a marker connector for associating a sender with this marker. 1, I r

The drawings when arranged as shown in Fig. '7 illustrate the detailed structure ofthis registering system. i I r Generai description.

The registering system herein disclosed maybe economically employed in a. large cross-bar switching toll telephone oflice such as fully dis;

closed in the patent application of G. V..King-,

J. B. McKim-O. Myers, SerialNo. 295,010, filed September 15, 1939, issued as Patent 2,236,246,

March 25,.1941, or a system such as disclosed. in thepatent application of A. J. Busch and F, J. Scudder, Seral No. 295,012, filed September .15, 1939.

. The incoming senderdisclosed in Figs. 1, 2, 3,

3A, 4, 4A and 5 may beenergizedby a pulsing, circuit in a distant ofiice or a pulsing circuit in the same oflice when required. The office indi.

I cated as I00 may be a distant toll office, a tandem oflice or other type of office known to the art, equipped with automatic pulsing circuits for operating registers in another office. In large toll offices, a switchboard may be in use having pulse ing equipment for controlling senders of I this character for handling delayed telephone calls. An incoming call enters an automatic switching telephone office such as the one disclosed herein, over trunk conductors such as I02 and I03 for actuating apparatus in an incoming trunk circuit such as I04. A sender link and connectorcircuit is diagrammatically shown for associating the incoming trunk circuits with an automatically operable sender. For a detailed description of the energizing of the link such as I05 for asso-..

ciating an incoming trunk circuit with a sender and for the energization of the sender inre sponse to this association, reference may be had to the aforementioned patent application of A. J.

Busch and F. J. Scudder, Serial No. 295,012, filed September 15, 1939.

In response to theselection of a sender by a link and the association of this sender with an incoming trunk circuit, apparatus in the sender is energized for associating pulse responsive equipment with the distant oifice I00. This includes common pulse responsive relays, a series of registers separately responsive to the pulses for each digit and relays for transferring the common pulse responsive relays from one register combination to the next in successive order between digits. It has been the practice in telephone ofiices to employ separate senders for three, four and five-digit codes. The pulsing circuit according to this invention includes registers which may be variably operated for one, two or three-digit codes on the first three registers, four-digit codes using the first four registers and five-digit codes using thefirst five registers.

These registers are combined in a manner for transferring the ofiice code digits tothree registers in a marker which controls the selection of an outgoing trunk to a terminating office, an outgoing trunk to a distant toll oifice or an outgoing trunk to a delayed outward toll switchboard. The relays 500, 50! and 502 shown in Fig. 5 are made selective by the sender registers according to the number of digits in a code which causes the operation of a particular one of these relays for associating certain combinations of registers of Figs. 4 and 4A with the three registers of the marker of Fig. 6. The registers of the marker have been diagrammatically shown since the contact and wiring arrangement may be identical with that fully disclosed inthe aforementioned Patent 2,236,246 to King-McKim-Myers, Serial No. 295,010, March 25, 1941.

A three-digit office call is registered on the relays of sender registers A, B and C. Circuits are established for selecting and operating relay 500 for connecting registers A, B and. C of the sender with registers A, B and C of the marker of Fig. 6. When the incoming call is to be routed through the apparatus of the toll office disclosed herein to a third toll ofilce, a second code registration is made by the transmission of pulses from oflice I00. This second code registration is recorded on registers D,- E and other similar registers which follow in consecutive order. When the incoming toll call terminates in the areaof the toll ofiice disclosed herein,.numerical digitsmay follow the three digits registered on the registers A,.B and C; In this case, the numerical digits are-recorded on registers D, E and other registers following in consecutive order.

An arrangement of equipment and circuits is provided in the sender to determine the number of digits-in the code being transmitted so that at the end of the code signals, the code registers may immediately be associated with the registers of the marker; For example, the registration of a three-digit code on registers A, B and C, the operation of the relays for advancing the pulsing circuit 'from one registerto another and the establishment'of other code determining circuits, energizes a starting circuit as soon as the last code. register'has been operated for immediately passing the signals to the marker registers. This circuit is established in different manners depending upon whether the registers are operated for a three-digit,,four-digit or five-digit code. In this manner; the'circuits are automatically rendered responsiveat the end of the registration of any number of digits.

As previously stated, the four-digit code energizes registers A, B, C and D. Operation of the register A energizes a signaling circuit to indicate a four-digit code and a relay is operated in the marker to indicate that a particular group of toll trunks shall be employed for completing this telephone connection. The remainder of the four-digit code is set up on registers B, C and D and in this case relay 50! is operated to associate this combination of, code registers, B, C and D with registers A, B and C in the marker. A fivedigit code employs the use of registers A, B, C, D and E. The first two registers A and B energize signaling equipment to indicate a five-digit code and equipment in the marker is operated to associate the marker registers with a particular group of route relays to obtain access to a particular group of trunks. The registration of a five-digt code energizes apparatus and associated circuits for operating relay 502 to associate the sender registers C, D and E with marker registers A, B and C.

A plurality of additional sender registers similar to thoseshown in Figs. 4 and 4A are used in successive order for outgoing oflice codes and numerical digits to be transferred later to other registering devices. As previously stated, the next in order sender register following the last sender register used for the incoming ofiice code is used for registering the outgoing office code or numerical digits. The sender registers on which the outgoing oflice code or numerical digits are recorded remain operated until after the first ofiice code has been registered in the marker and the'marker has selected an outgoing trunk. This outgoing trunk may be a completing trunk to an office within the area of this toll ofiice or a toll trunk to a distant toll office. To obtain the effect of incoming and outgoing pulses as recorded on the sender registers, it may be assumed that two office codes have been registered and that the second ofiice code is an outgoing code. If the first office code is a three-digit code, it is registered on the sender registers A, B and C. This code may be assumed as a toll code which will be transferred to a toll marker such as 620 for obtaining a trunk to a particular distant toll oflice. The second code may be a three-digit code which is registered on three successive registers starting with register D. After the outgoing trunk has been selected by the marker according to the first code and has been connected to the distant office, the second code registered may be transferred to another registering device, which latter code is registered in a distant oflice and represents the trunk to be obtained in that ofiice for completing or continuing extension of the telephone connection.

The following detailed description explains the working of the sender equipment in forming the various combinations of registers responsive to different code pulses.

Detailed description An incoming trunk I04, diagrammatically shown, is selected regardless of the number of digits to be transmitted to the sender. The seizure of an incoming trunk energizes the sender link and connector circuit I05 in order to find an idle sender and associate this sender with the calling incoming trunk. The selection of the sender energizes relay Ml to maintain this sender busy to prevent its selection by another link circuit energized by a different trunk. The energization of relay Ml establishes a circuit for relay 202 which extends from ground or contact 3 of relay I4I through resistance 220, both windings of relay 202 and through the winding of a relay known as the splitting relay I06 in the incoming trunk circuit I04 to battery. Relay 202 is operated in the circuit traced but the splitting relay in the trunk circuit is not operated at this time. The operation of relay 202 establishes a circuit for relay 20I. This circuit is obvious and need not be traced. Relay 2! establishes a number of circuits by association of ground through its contacts. A circuit for relay 204 is established from battery through its winding to ground on contact 4 of relay 20I. -A circuit is established for relay 300 from battery through its winding to ground on contact of relay 20I. Ground on contacts I and 2 of relay 20I are connected through the link circuit to the cut-off relay in the incoming trunk (not shown) and a second relay (not shown) which opens a link control circuit. The sender has now been prepared to receive signals over the trunk circuit conductors. The operation of relay 204 establishes circuits for the pulsing relays 209 to 2I4, inclusive. Contact 4 connects battery through

relays

209, 2 and 2I3, resistance I20, contact 2 of relay 2I3, conductor I36 to the trunk circuit I04. Contact 5 connects battery through relays 2I0, 2I2 and 2M, resistance I2I, contact 5 of relay I I3, conductor I31 to the trunk circuit I04. Battery is thus provided for signals fromthe trunk circuit which may operate the sender class relays for indicating the class of the call to the sender. As soon as battery is connected through the circuit traced by the operation of relay 204 either relay 209 or 2I0 or both of these relays are operated to indicate the type of equipment in the sender and the marker to be used for the incoming call. When relay 209 is operated by a ground associated with lead I30 in the trunk, a circuit is established for relay I II from ground through the contact of relay 209 over lead 220, contact I of relay I I3, contact 3 of relay I I I, winding of relay II I to battery. The operation of this relay indicates that toll completing equipment in the marker shall be selected for connecting the incoming trunk to a trunk associated with an office within the area of this toll office. A ground associated with lead I3I energizes relay 2I0 which connects ground through its contact, contact 4 of relay I I3, contact 3 of relay I I 0, winding of relay IIO to battery. The operation of the latter relay will ultimately control the association of the sender with equipment in the marker for obtaining a trunk to another toll ofiice. The energization of either of the above relays H0 or III establishes locking circuits for themselves and whichever relay is operated a circuit is established for relay II2. This circuit may be traced from battery through the winding of relay II2 through contacts 4 of either relay H0 or III to ground on either relay 209 or 2I0, whichever one is operated. The operation of relay II2 establishes a circuit for relay 203 from battery through the winding of the latter relay to ground on contact 2 of relay H2. The operation of relay 203 associated ground with the mid-point beresistance in the circuit of the splitting relay in trunk circuit I04, causing its operation The operation of the splitting relay I06 opens leads I36 and I31, causing the release of relays 209 and 2I0 or whichever one was operated. This causes the operation of relay H3 in the following manner: When relay II2 was operated, its operating ground was connected through its contact 3 over lead I30 to the left winding terminal of relay I I3. At this time, ground is also connected to the other winding terminal of relay I I3 over lead I3I from contact 3 of relay 204. The release of relay 209 or 2I0 disconnects ground from lead I30. This circuit from ground through the contacts of relays 209 and 2I0 may be traced over

leads

220 and 224 through contacts I and 4 of relay II3, contacts 4 of relays H0 and III, contact 3 of relay II2 to the left winding terminal of relay II3. Thus the release of relays 209 and 2I0, or

whichever one was operated, causes battery to flow through the winding of relay I I2 and its contact 3, lead I30, windingof relay II3, conductor I 3I to the ground on contact 3 of relay 204. Relay I I3 operates and holds relay I I2 operated. Relay H3 in operating disconnects the circuits extending through relays 209, 2I I, 2I3 and through relays 2I0, 2I2 and 2I4-from conductors I36 and I 31 which associated these relays with the trunk circuit.

A circuit is now prepared for operating the.

registers and for steering the pulsing leads from one register to another after each digit has been registered by the association of pulsing relays I09 to H4, inclusive, with the pulsing circuit in the following manner. Relay II3 establishes a circuit through the windings of

relays

320 and 400 for the association of the pulsingcircuit relay contacts with the registers. This circuit may be traced from battery through the winding 320, winding of relay 400, contact 5 of relay 405, contact I of relay 328, thence over lead 230 to ground on contact 3 of relay I I3.

Relays

320 and 400 operate in the circuit traced and a locking circuit is established from battery through the windings of these relays,,contact 5 of relay 405, contacts 4 and-3 of relay 320 to ground over the operating circuit on contact 3 of relay II3. Relay 328 is also operated from battery through its'winding, contact 2 of relay 320 to ground on contact-3 of relay H3. It should be noted that the operation of relay 32B opens the original operating circuit for

relays

320 and 400, so that when these relays are released they will not again operate over this circuit. The operation of relay 328 also establishes a circuit for relay III. This circuit may be traced from battery associated with the distant pulsing circuit over lead I40 through contact 3 of relay II5, contact 4 of relay H6, contact 3 and winding of relay II'I, contact 2 of relay 328 to ground on contact I of relay 300. The operation or relay III establishesa locking circuit for itself from battery through resistance I23, contact 3 and winding of relay II! to the operating ground and associates pulsing leads I39 and I40 from the distant pulsing circuit with pulsing relays I09 to H4,

inclusive. Pulsing leads I39 and I40 extend through

contacts

2 and 3 of relay H5,

contacts

2 and 4 of relay H6, contacts I and 2 of relay II I, thence through the pulsing relays H3, 2! I, 209 to battery on contact 4 of relay 204 and through the' pulsing relays 2I4, 2I2 'and 2I0 to battery through contact 5 of relay 204.

Telephone call using three-digit code The following is given as an exampleoi recording a three-digit oflice code. The pulses transmitted over either pulse lead I33 or I40 operate either relay 209 or 2I0 for controlling the successive order in which the registers are operated. The pulse responsive operations of relay 2II or 2I3 over lead I39 or relay 2I2 or 2I4 over lead I40 regulate the number of relays operated in each register. Assuming that relay 209 is operated by a pulse over lead I 39, ground is associated through its contact with conductor 220 which extends through contact I of relay Ii3, conductor 22I, contact I of relay 320, which it will be remembered is operated, winding of relay 32I to battery. Relay 32! operates in this circuit for preparing a transfer operation as explained later. If this same pulse is of a character to operate the pulsing relay 2 a circuit is established for the AI register relay 40I from ground through the contact of relay 2 over lead 222, contact I of relay 400, winding of the AI register 40l to battery, operating this register relay. If the pulse was of a character to operate pulsing relay 2I3 instead of 2! I, a circuit is established for the A2 register relay 402 from ground through the contact of relay 2I3 over the conductor 223, contact 2 of relay 400, winding of. the A2 register, relay 402 to battery. A pulse associated with the alternate pulsing conductor I140 will operate relay 2I0 which establishes the same circuit as relay 209 for operating relay 32I as traced. If this pulse is of a character to energize relay 2I2, ground is associated with conductor 225 which extends through contact 4 of relay 400 for energizing the A5 register relay 404 to battery. When pulsing relay 2I4 is energized, ground is associated with conductor 220 which extends through contact 3 of relay 400 to the winding of the A4 register relay 403 to battery. Each A register relay operated establishes a locking circuit through its alternate winding to ground on contact 4 of relay 300. The above gives an example of the operation of the various register relays responsive to pulses which selectively operate the pulsing relays 2| I, 2I2, 213 and 2I4. The digits are represented by numerals or letters and pulses are accordingly transmitted to effect the operation of certain registers in the following manner.

For this example it may be assumed that the three-digit code is 241 and therefore that the A2 register relay 402 was operated by the first digit pulse.

After the pulses for a digit have been sent, the pulsing circuit is opened, causing the release of any of the pulsing relays 209 to 2I4, inclusive, which were operated to register the digit. The release of the pulsing relays after the first digit pulse opens the operating ground circuit for relay 32I previously traced through contact I of relay 320, contact I or 4 of relay II3 to ground on the contacts of relay 209 or 2I0. When this ground circuit is opened, relay 405 is energized in series with relay 32I over a circuit which may be traced from battery through the winding of relay 32 l, winding of relay 405, contact 5 of relay 4I0,

contacts

4 and 3 of relay. 32I to ground over conductor 230 as previously traced on contact 3 of relay H3, The operation of relay 405 opens the locking circuit for both

relays

320 and 400, causing their release. The operation of relay 405 associates relays 406, 401, 408 and 409 of the sender B register with the pulsing relays 2| I, H2, 2 I 3 and 2 I 4 so that the next series of pulses energize the relays of the B register in a selective manner according to the pulsing relays energized. The pulsing circuit and registers are now prepared for recording the second digit.

The second digit again operates either relay 209 or 2I0, or both, depending upon whether the pulse is sent over lead I39 or I40. The operation of either or both relays associates ground through either

conductor

220 or 224, or both, as previously traced. The conductors extend through the contacts I and 4 of relay M3 to conductor 22L Since relay 320 is now released, the ground circuit extends through contact I of the latter relay and contact I of relay 32I which is operated, winding of relay 322 to battery, which operates relay 322 and prepares the steering circuit for a subsequent transfer of the pulsing circuit. Assuming that the second digit causes the operation of relay 2I4 for registering the digit 4, theground is associated with conductor 220 which extends through-contact 3 of relay 405, winding of the B4 register relay 408 to battery, operating this relay, which looks through its lower winding to ground on contact 4 of relay 300. After the registration of this digit the pulsing relays are again released, which disconnects ground from the operating circuit which was traced for relay 322. This relay, however, is held through a winding of relay M0 for operating the latter relay. This circuit may be traced from battery through the winding of relay 322, winding of relay 4I0, contact 5 of relay 4I5,

contacts

4 and 3 of relay 322 to ground over lead 230 as previously traced. Relay 4I0 is thus operated for associating the windings of relays 4 to M4, inclusive, of register 0 with the pulsing circuit. The operation of relay 4I0 causes the release of relays 405 and 32I. When the pulses are received for the third digit, the energization of either relay 209 or 2I0 again associates ground with conductor 22I which extends through contact I of relay 320, released, contact I of relay 32I, released, contact I of relay 322, operated, winding of relay 323 to battery, operating the latter relay.

Assuming that the third digit is I both relays 209 and 2I0 are operated and pulsing relays 2I3 and 2I2 are operated to energize the C2 and C5 register relays M2 and M4; Ground is therefore associated with leads 223' and 225 which extend through

contacts

2 and 4 of relay 4I0, windings of relays M2 and M4 to battery. Both register relays look through their lower windings to ground on contact 6 of relay 300. Upon the release of the pulsing relays ground is removed from lead 22I which permits relay M5 to operate in series with relay 323 in the manner explained for the preceding relays. The circuit'for relays M0 and 322 is thus opened, causing their release and relays 323 and. 415 remain operated. Relay 4I5 associates the relays of register D with the pulsing relay 2| I to 2I4, inclusive, for recording numerical code pulses or pulses for another office code, whichever is required to follow after takes place immediately after the last digit in a the office code has been registered. When this call requires a trunk extending to another toll oflice, relay 326 is energized and when the call terminates within the area of this ofiice relay 321 is energized. The operation of relay 326 arranges circuits for obtaining a routing in the marker for a toll trunk and the operation of relay 321 arranges the circuit for obtaining a terminating trunk routing in the marker. Three-digit codes are used for either extensions to another tool oflice or to a terminating oliice within the area of the switching ofiice. A circuit for relay 326 is energized from battery through the Winding of this relay to ground on contact I of toll relay H0. The circuit for relay 321 is energized from battery through its winding to contact I of relay III to ground on contact I of relay IIO. It will be remembered that when a toll trunk is required relay H is operated and when a terminating trunk is required relay III is operated and relay H0 is normal. After the last code digit is recorded relay 323 remains operated for a sufficient length of time to establish a circuit for transferring the registrations to the marker by energizing relay 201. The circuit for relay 201 may be traced from battery through its windings over lead 225, contact I of relay 223, contact 2 of relay 303, contact I of relay 326 when a toll trunk is required, contact I of relay 34l to ground on contact of relay 300. If a terminating trunk is required, the circuit, after passing through contact I of relay 323, is carried through contact 4 of relay 302, contact I of relay 326 which is then normal, contact I of relay 34I to ground on contact I of'relay 300.

The operation of relay201 over a circuit as previously traced through relay 323. energizes relay 500 immediately after the third digit has been registered. The circuit for relay 500 may be traced from battery through its winding, contact 3 of relay 302 or contact 4 of relay 303 both of which are normal at this time. If relay 321 is operated for the selection of a completing trunk by the marker the circuit extends from contact 3 of relay 302, contact 3 of relay 321 to ground on contact 6 of relay 201. If, on the other hand, an extension is to be made to a distant toll oifice relay 321 is normal and relay 326 is operated. Consequently the circuit may be traced through contact 4 of relay 303, contact 3 of relay 326 to ground on contact ,5 of relay 201. The operation of relay 500 connects the contacts of the A registers MI, 402, 403 and 404 to the windings of the A register relays in the marker. The A register in the marker constitutes

relays

600, 60I, 602 and 603. Lead AI extends through contact I of relay 500, contact I of relay 503, winding of the AI register relay 600 to battery. Lead A2 extends through contact 2 of relay 500, winding of the A2 marker register relay 60I to battery. Lead A4 extends through contact 3 of relay 500, contact 2 of relay 503, winding of the A4 marker register relay 602 to battery. Lead A extends through contact 4 of relay 500, through the winding of the A5 marker register relay 603. On a three-digit call relay 503 is not operated and therefore the purpose of this relay will be explained later. Leads BI, B2, B4 and B5 are extended from the contacts of the B sender register through contacts 5 to 8 respectively of relay 500, thence through contacts I to 4 of relay 504 which is normal and through the windings of the marker B register relays 604, 605, 606 and 601 to battery. The CI, C2, C4 and C5 leads are extended from the C sender register through contacts'9 to I2, inclusive, of relay 500, contacts I to 4 of relay 505 which isnormal,

through the windings of the marker 0

registers

608, 609, BIO, 6H to battery. It will be remembered that in giving this example of a three -digit oflice code the 'A register relay .402 was operated, VB register relay 408 was operated and C register relays M2 and M4 were operated. Ground is therefore connected through contact I of relay .402 to lead A2 for operating the A2 marker register relay 60I. Ground through contact I of relay 408 is connected to lead B4 for operating the B4 marker register relay 606. Ground through contact I of relay M2 is connected to lead C2 for operating the C2'marker register relay 609 and ground through'contact l of the relay M4 is connected to lead C5 foroperating the C5 marker register relay 6| I. H V

The purpose of relay 504 is to register a zero in-the B marker register when zerois the second digit of a three-digit code. A zero is registered in the marker by the operation of the BI and. B4 relays 604 and 606, respectively. When a zero is recorded by the sender B register none of th relays 406, 401,- 408 or 409 is operated.

This establishes a circuit for relay 504 from battery through its left winding, contact I4 of relay 500, contact l of register relay 406, contact 4 of register relay 401, contact 4 or register relay 408; contact 4 of register relay 409 to ground on contact 3 ofvrelay 300. The operation of relay 504 associates ground with lead GM for operat- Trunk groups The marker register relays are operated in various combinations for'causing the operation of particular units, tens and fifties relays in the marker as disclosed in detail in the aforementioned Patent 2,236,246 to 'King-McKim-Myers, March 25; 1941, and need not be described in detail in this application. .When a three-digit code is recorded by the sender registers and transferred to the marker registers a particular group of units, tens and fifties relays are associated with the registers. This'obtains' one of many route relays extending over to completing trunks when relay H8 is operated or to toll trunks to other toll ofiices when this relay is normal. This of cours includes a large plurality of groups of trunks extending to a large number of ofiices but it maybe known herein as the three-digit group of trunks. In a large toll office there may not be sumcient routing paths which may be reached by three-digit codes and consequently a separate group is necessary which may be reached by four-digit codes. In this type of toll ofiice a four-digit code associates the marker registers with a different group'of fifties relays so that another'plurality of route relay 504 trunks is reached through these relays.

telephone call to another toll oflice.

relays is reached through the latterfifties relays and consequently another large group of toll This may be known herein as the four-digit group of trunks. Relay 6!! causes thetransfer from the three-digit group of trunks to the four-digit group of trunks by associating a' different group of fifties relays with the marker registers. A

third large plurality of trunks is used for fivedigit codeswhich may be known herein as the five-digit code group of trunks. Relay 6H5 is operated for the five-digit group which associates a third group of fifties relays with'the marker A, B and Cregisterrelays. The latter group of fifties relays also has a third large plurality of route relays associated therewith for routing the five-digit code telephone calls to the five-digit group of trunks.

Telephone call using four-digit code Four-digit codes are used only for extending a This call may originate inan associated tandem oflice or a distant toll office. The pulses are received in a similar manner to that described for the threedigit code with the exception that the'four-digit code invariably starts with zero. For example,

a four-digit code may comprise the numerals 0532. The class registration from the associated trunk operates relay to indicate that the call is to be extended to another toll oflice. As previously traced, the circuit for this relay is, from battery through its windingand contact 3, contact4 of relay H3 to ground on relay 2! 0. The preceding operations of relays !4!, 20!, 202, 204 and 300 are the same as described for the telephone call using athree digit code. After relay !!0 is operated a circuit is established for relay 326'which'is a toll call relay for guiding the energization of the start relays after the four-digit code has been received. Relays !l2 and 203 are operated in a manner previously described which cause the operation of relay 3 to disconnect the class of call leads I36 and !3! from the pulsing relays 209 to 2!4, inclusive. Relays'320 and 400 are operated by ground on contact 3 of relay !!3 and relay 320 is operated to this same ground through contact 2 of relay 320, An operating circuit for relay II! is established by the operation of relay 328 extending from battery in the pulsing circuit over lead I40 throu h the winding of relay H! to ground on contact of relay 300. The operation of relay ll! connects the pulsing relays 209 to 2!4, inclusive, to the pulsing circuit over leads I39 and I40. digit dialed from the distant oflice, none of the A register relays 40!, 402, 403 or 404 is energized, since the first pulse does not energize any of the relays 2!!, 2I2, 2!3 or 2!4. Relay 2!0, however,

is operated on this first pulse which places ground on lead 22!, causing the advance of the transfer relays and the advance from the A register to the B register takes place. As will be remembered, this advance is accomplished by the operation of relay 32! and relay 405. Upon the terminationv of the first pulse the operation of relay 405 releases relays 320 and 400. It may therefore be assumed at this time that relay 32! is operated in the transfer group and relay 405 is operated for extending the pulsing circuit to the B register relays 406 to 409, inclusive. If the second digit to be recorded is 5, pulse relays 2!0 and 2!2 are operated, which places ground on leads 225 and 22!.

Since zero is the first The ground on lead 225 extends through contact 4 of relay 405, winding of B regtery, operating relay 323.

M6 to HQ with the pulsing relay contacts.

and 209 to energize. 209 associates ground with lead 22! extending through contact of relay 320, contact of relay ister relay 409 to battery, operating relay 409 which looks through its lower winding and contact 3 to ground on-contact 4 of relay 300. The ground on lead 22! operates relay 322. Upon the release of the pulsing relays a transfer takes place for associating the C register relay with the pulsing circuit. The release of relay 2!0 removes ground from lead 22! which removes the shunt from relay 4!0, causingthe operation of relay 4!0 from battery through the winding of relay 322, winding of relay-410, contact 5 of relay 415,

contacts

4 and 3 of relay-322 over lead 230 which extends to ground on contact 3 of relay !3. The operation of relay4l0 opens the circuit for relays 32! and 405 which release. The pulse relays are again operated for the third digit and assuming that this digit-is 3, C register relays 4!! and M2 are operated. Consequently the incoming pulse would operate pulsing

relays

209, 2!! and 2 I 3. The operation of relay 209 associates ground over lead 220 through contact I of relay! !3, lead 22!, contact of relay 320, contact of relay 32!, both of which arenormal, contact of relay 322, which is operated, winding of relay 323 to bat-

Relays

322, 323 and M0 are therefore now energized. Pulse relay 2! I associates ground with lead 222 and pulse relay 2!3 associates ground with lead 223. Lead 222 extends throughcontact of relay M0 for energizing relay 4!! 'and'lead 323 extends through contact 2 of relay M0 for energizing relay M2. These are the C! and C2 register relays which are operated for recording the numeral 3. Both relays'lock through their alternate windings to ground on contact 6 of relay 300. At the end 'of the third'pulse relays 209, 2!! and 2!3 release which removes the shuntfrom relay 4!5, causing its operation. The operating circuit for relay 4|5 extends from battery through winding of relay 323, winding of relay 4! 5, contact '5 of relay 420,

contacts

3 and 4 of relay 323, lead 230 to ground on contact 3 ofrelay !!3. The operation of relay 4!5 associates the D register relays It may be assumed that the fourth digit is represent-- ed by the numeral 2 which causes pulse relays 2 l 3 The energization of relay 32!, contact of relay 322, all of which have been released, contact 2 of relay323 which is operated,

winding'of'relay 324 to battery, operating relay 324. The ground onthe contact of relay 2!3 extendsover lead 223 to contact 2 f relay 4!5, up- 55 per winding of the D2 register relay 4!! to battery, operating the latter relay. This relay locks through its lower winding and contact 3 to ground on contact 6 of relay 300. The four digits have thus been registered.

Since no relays were operated in the A register a circuit was established for the four-digit relay 303 which may be traced from battery through its winding, contact of the A! register 40!,

contact 3 of the A2 register 402, contact 3 of the A4 register 403, contact 3 of the A5 register 404 to ground oncontact 3 of relay 300. Certain circuit combinations are arranged when relay 303 and toll relay 326 are operated to indicate a four-digit call to the marker as will hereinafter be described. Also, a circuit is established at this time for transferring the registrations from the sender registers B, Cand D to the marker registers A, B and C. The fact that relay 324 was the last of the transfer relays to operate also completes the four-digit circuit combinations so that certain relays can operate. A circuit for relay 20! is established through the contact of relay 324 which may be traced from battery through the winding of relay 20! over lead 255, contact I of relay 324, contact 2 of four-digit relay 303, contact I of relay 326, contact I of relay 343 to ground through contact I of relay 300. Acircuit is established for relay 6!! in the marker to associate the marker registers with particular fifties relays which associate the register with route relays for selecting trunks used for four-digit toll connections. This circuit may be traced from battery through the winding of relay 6!'!, contact I of four-digit relay 303 which is operated to ground on contact I of the fivedigit relay 302 which is normal. Relay 50! is operated to associate the sender registers B, C and D with the marker registers A, B andC. The circuit for relay 50! may be traced from battery through its winding, contact 4 of fourdigit relay 303, contact 3 of toll trunk relay 326 to ground on contact 5 of relay 201. It should be noted that the foregoing circuit is traced through the contact of the four-digit relay 303 and the contact of the toll relay 326 which must be operated to establish this circuit.

'The contacts of the sender B relays 406, 401, 408 and 409 are new extended over leads BI,

B2, B4 and B5 through contacts I to 4 of relay 50!, conductors 63! to 634 to the windings of the marker A register relaysAI, A2, A4 and A5. In giving this example it will be remembered that the sender register relay 409 was operated for registering the numeral 5 and consequently the ground is associated with the B5 lead which extends through contact 4 of relay 50!, winding of the A5 marker, register relay 603 to battery which causes the registration of the numeral 5 in the toll marker register. The contacts of the sender C registers 4!! to 4I4, inclusive, are extended over leads CI, C2, C4 and C5 through contacts 5 to 6, inclusive, of relay 50!, through the normal contacts of relay 504 over conductors 64!, 642, 643 and 644 to the windings of the toll marker B register relays. In this example the numeral 3 was registered which associates ground with the B! and B2 leads in the sender for operating the marker register relays 604 and 605. The contacts of the D sender register relays are carried over leads DI, D2, D4 and D5 through contacts 9 to I2 of relay 50!, normal contacts of relay 505, conductors 65!, 652,653 and 654, windings of the toll marker C register relay, to battery. In this example the numeral 2 was registered in the sender and consequently a ground is associated through contact I of relay 4!! with lead D2 for operating the toll marker C2 register relay 609. If a zero should have been registered in the C sender register in place of 3, the C sender register relays would have remained normal, but in all cases the zero is recorded in the marker register by the operation of the and 4 register relays. In this instance the zero registered in the C sender register would record a zero in the toll marker B register by operating the B! relay 604 and the B4 relay 606. For this purpose a circuit is established for relay 504 extending from battery through its left winding, contact I4 of relay 50!, thence over lead 522 through contact I of the C register relay 4II, contacts 4 of register relays 4I2, 4I3 and M4 to ground on contact 3 of relay 300. The operation of relay 504 associates ground with leads 64! and 643 which extend through the windings of

relays

604 and 606 to battery, operating the B! and B4 register relays for registering the 7 The five-digit code is again different from the one, two, three and four-digit codes since the character of the trunk routing must be given by signals to the registering device ultimately receiving the call indication. To give this call indication each of the first two digits of the fivedigit code is ordinarily registered as one. This number is arbitrarily selected and other numbers may be used if so desired. An example of a five-digit code may be assumed as 11648. Consequently, in response to the pulses transmitted from a pulsing station or pulsing circuit the sender register relays will be operated in the following manner. A register relay 40!, B register relay 40 6, C register relays 4!! and M4, D register relay 4I8, E register relays 42!, 422 and 424. r

The above registers the numerals 11648 on registers A to E consecutively.

An idle incoming sender of the character disclosed is selected by the energization of an incoming trunk such as I04 and the sender link and connector circuit I65 in the manner previously described and relays of the sender are energized in response to this selection also as previously described. This includes the class. registration for operating either relay H0 or III and the transfer of the pulsing relays 209 to 2I4 from leads I36 and I3! to the pulsing leads I39 and I40. Relay H3 is operated to dissociate leads I36 and I3! from the pulse relays and relay II! is operated to associate pulse'leadsv I39 and I40 with the pulsing relays. The operationof relay II3 also connects the contacts of relays 209 and 2I0 to the armature of relay 320 as previously traced to operate the steering or progression relays fortransferring the pulsing relay contacts from one sender register to another. It will be remembered that relays 320 and 400 are originally operated over a circuit from battery through the windings of

relays

320 and 400, contact 5 of relay 405, contact I of relay 328, thence over lead 230 to ground on contact 3 of relay H3. The operation of relay 320 associates ground from lead 230 through

contacts

3 and 4 for maintaining this circuit established and locking

relays

320 and 400 operated. A circuit 'isestablished from this ground through contact 2 of relay 320 to operate relay 328, dissociating the original operating circuit from

relays

320 and 400 so that they are maintained over the locking circuit through

contacts

3 and 4 of relay 320. The operation of

relays

320 and 400 arranges the register circuit for receiving the first pulse. Since the first pulse is 1, relays 209 and 2!! are operated. Relay 209 connects ground with lead 220 which extends through contact I of relay II3 to lead 22!, contact I of relay 320, winding of relay 32! to battery, operating relay 32L The operation of the pulse relay 2! I associates ground with relay 322 which extends through contact I of relay 400 for energizing the A! register relay 40!. Relay 40! is locked to ground on contact 4 of relay 300. When-the pulsing circuit is opened relays 20! and 2!! release. The release of relay 209 dissociates ground from conductors 220 and 22! which removes the shunt from relay 405, permitting it tooperate in series with relay 32! as'previously traced. The operation of relay 405 opens the circuit for

relays

320 and 400, causing their release, and associates the sender B register relays 406 and 409 with the pulsing circuit.

Since the second pulse is I, relays 209 and 2 are again operated. In this instance ground is connected from relay 2II to lead 222, which extends through contact I of relay 405 to operate the BI register 406, which locks to ground on contact 4 of relay 300. Ground from the contact of relay 209 in this instance is extended through contact I of relay 320, contact I of relay 32I, winding of relay 322 to battery as previously described.

After the sender A and B registers have been operated a circuit is established for the five-digit relay 302 and also for the auxiliary register relay 428. The circuit for relay 428 extends from battery through its winding, contact I of A register relay 40I, contacts 3 of A register relays 402, 403 and 404 to ground, contact 3 of relay 300. The circuit for the five-digit relay 302 extends from battery through its winding, contact I of relay 428, contact I of BI register relay 406, contacts 4 of- B register relays 401, 408 and 409 to ground on contact 3 of relay300. The operation of the five-digit relay 302 established a circuit for a five-digit trunk group relay in the marker which is effective whenever the marker is selected by i .the sender. This circuit may be traced from battery through the winding of the marker fivedigit trunk group relay 6I6, contact 2 of relay 302, contact 3 of the normal four-digit relay 303 to ground. It will be noted that the four-digit relay 303 must be normal and the five-digit relay 302 operated in order to complete this circuit.

The pulsing circuit continues to function in the manner previously described for setting the sender C, D and E register relays. After the fourth digit has been registered on the D registers relay 420 is operated and when the pulsing relays are operated for registering the fifth digit, relay 325 is operated. After the fifth pulse has been completed and the pulsing circuit restored to normal a circuit is established through relay 325 for establishing the start circuit to transfer the code digit from the sender to the marker. This circuit energized relay 201 through the contact of relay 325. This circuit may be traced from battery through the winding of relay 201 over conductor 255, contact I of relay 325, contact 4 of five-digit relay 302, contact I of relay 326, contact I of relay 34I to ground on contact I of relay 300. For a five-digit call relay 321 is operated over a circuit from battery through its winding, contact I of relay III to ground through contact I of relay H0. The operation of relay 201 therefore establishes a circuit for relay 502 from battery through its winding, contact 3 of five-digit relay 30 2, contact 3 of relay 321 to ground on contact 6 of relay 201. The

- operation of relay 502 now associates the contacts of sender registers C, D and E with the windings of the marker registers A, B and C. Since the numeral 6 was registered on the sender C, register relays 4H and 4I4 were operated. This connects ground from contact 3 of relay 4i I with the CI lead which extends through contact I of relay 502, contact I of relay 503, conductor 63!, winding of the marker AI register relay600 to battery. The marker register relay 600' is thus operated and locked in the manner described for the sender register relay. Ground is also connected from contact I of relay M4 to lead C which extends through contact 4 of relay 502, lead 634, winding of the A5 register relay 603 to battery, operating this register relay which locks in the manner described for the sender register relay. The'leads from the sender D register are connected through contacts 5 to 8, inclusive, of relay 502. Since the digit 4 was registered on the sender D register, ground is connected through contact I of relay 4I8 to the D4 lead, through contact I of relay 502, contact 3 of relay 504, lead 643, winding of relay 606 to battery. In the sender E register three relays El, E2 and E5 were operated to record the numeral 8. Consequently, ground is associated with leads EI, E2 and E5 from contacts I of relays MI, 422 and 424. These leads extend through contacts 9, I0 and I2, respectively, of relay 502 which are carried through contacts I, 2 and 4 of relay 504, thence over leads 65I, 652 and 654 for energizing the marker register relays 608, 609 and BI I. The marker registers having been 0perated are associated through the contacts of the five-digit relay 6I6 with a particular group of units, tens and fifties relays which have the particular group of route relays associated therewith and therefore particular trunks are selected when a five-digit call is registered.

The various trunk routes or trunk groups are shown diagrammatically in Fig. 6 associated with the units, tens and fifties relays and route relays for extending incoming calls to trunks over these routes. The one, two and three-digit trunk groups are shown diagrammatically as a triangle 662, the four-digit trunk groups are shown diagrammatically asa triangle 665 and the fivedigit trunk groups are shown diagrammatically as the triangle 668. After registration of the three-digit code on the marker'registers A, B and C, ground is associated through the contacts of these registers with the units, tens and fifties relays 660 for energizing a particular route relay 66I to obtain an idle trunk in the trunk group 602. The contacts from the register relays are shown diagrammatically extending through the back contacts of the four-digit relay SH and the five-digit relay 6I6 to the relays 660. When a four-digit code is registered on the marker registers A, B and C, relay 6I1 is operated. Consequently the contacts of the registers are extending through the inner contact of relay 6I1 to the units, tens and fifties relays 663 for energizing a particular route relay to obtain an idle trunk in the trunk groups 665. A five-digit code register on the marker registers A, B and C obtains access to the five-digit trunks through the inner contact of the five-digit relay 6I6 which is energized when a five digit code is registered. The contacts of the register relays are extended through the back contacts of relay 6I1, inner contacts of relays 6I6 to the units, tens and fifties relays 666 for operating a particular route relay 661 to select an idle trunk in the five-digit trunk groups 668.

After all of the digit pulses have been transmitted from the pulsing circuit I01 to the sender, a terminating pulse is transmitted to disassociate the pulsing circuit I01 from the sender. As previously stated, these pulses may include the digits for an oflice code which is transmitted to the marker registers and the digits for a second ofiice code or numerical digits which may be transmitted over a terminating toll trunk. The number of sender registers operated depends upon the number of digits transmited and consequently the register following the last register used for the digits is operated by the terminating pulse. This terminating pulse energizes pulse relays 2H and 2I4 representing the

numerals

1 and 4. This combination is chosen for a terminating signal since it isnot used for any digit,

Register relays 426 and 421 are operated by the terminating pulse when all of the other registers have been taken for use. When all of the other registers have not been taken. for use the next successive register operates in the manner hereinafter described instead of the registers 426 and 42?. Assuming that relay- 325 has been operated in the regular routine of registering digits and that this is the last regular digit tobe registered, relay 330 would have been operatedwhen the pulses were recorded on the register relays 42I to 424, inclusive. At the termination of this pulse a circuit would have been established for relay 425 from battery through the winding of relay 330, winding of relay 425, contact 2 of relay 330, lead 230 to ground oncontact 3 of relay H3. When the terminating pulse is received for operating relays 2H and 2M, a ground is connected with lead 222 which extends through contact 3 of relay 425, winding of relay 426 to battery, operating relay 4% which locks to ground on contact 3 of relay 300. Ground is also extended from relay 2I4 over lead 225, contact 2 of relay 425, winding of relay M1 to battery which operates relay 421 and locks this relay to the same'ground as relay 426.. Ground from the contacts 2 of register relays 42B and 421 is connected through

contacts

2 and 3 of out-pulsing relay 3I4 for controlling the operation of steering relays 304 to 308 and 3-I0 to 3I3 for sending out the pulses registered in any of the registers after the office code registration is transferred to the marker. The outgoing pulses are transmitted after an outgoing trunk is selected in the manner fully described in the patent application of A. J. Busch and F. J. Scudder, Serial No. 295,012, filed September. 15, 1939.

The operation of relays 2H and 2I4 also associates ground through the left and right windings of relay 205 for operating the latter relay. Relay. 205 when operating establishes an obvious circuit for relay 206 which looks to ground on contact 8 of relay 300. 'Relays 2H and 2l4 are released at the termination of the transmission of the last pulse which causes the release of relay 205. Since relay 206 remains operated a circuit is now established for relay 208 from ground on contact 8 of relay 300 through the contact of relay 206, back contact of relay 205, Winding of relay 208 to battery. Relay 208 establishes a locking circuit for itself to ground on contact 8 of relay 300 and establishes an operating circuit for relay H5. The latter circuit may be traced from ground on contact I of relay 208 through contact 3 of relay II 6, winding of relay H5 to battery. The operation of relay I I5 connects battery through resistance I22 to lead I40 and battery through the right winding of relay H4 to lead I39. Leads I39 and I40 extend through the windings of a polarized relay in the pulsing circuit which is now energized to indicate to the pulsing circuit that the registers in the sender have satisfactorily operated for recording the digits as transmitted from the pulsing circuit. This polarized relay in operating connects ground to lead I39 which causes the energization of relay H4. The latter relay in operating associates its leftwinding in circuit with the winding of relay H6 which extends to ground on contact 6 of relay H3. The operation of relay H6 opens the pulsing leads I39 and I40 extending to the sender pulsing relays 209 to 2I4, inclusive, and causes the release of relay H5. The operation of relay H6 and the release of relay H5 places resistances I24 and condense I across the pulsing leads I39 and, I40 as a signal to. the pulsing operator or to anautomatically operating pulsing circuit that the send'er has advanced and. cut off the pulsing circuit.

What is claimed is:

1. In a digit, registering system, aregistering device, a plurality of individual registers in said,

device, a plurality of individual registers in said registering device each capable of variably registering digits, pulse responsive means, means in said registering device variably responsive to said pulse responsive means for forming said individ ual registers into different combinations, each combination including different individual registers, a second registering device, and a plurality of means in said first registering device, equivalent in number to the number of possible register combinations for digit registrations, selectively operable in response to circuits established inthe registers S0 combined for connecting the registers formed into said combinations withthe registers of said second registering device for setting the registers of said second registering device.

3. In a digit registering system, a registering device, a series of individual registers in said registering device, each capable of variably registering digits, pulse responsivemeans, second and third registering devices each having individual registers, means in said firstregistering device variably responsive to said pulse responsive means for variably forming different numbers of said individual registers into different digit registering combinations, means individual to each combination so formed for connecting the registers formed into said combinations with the registers in said second registering device, and means in said first registering device for operating the next in order-registers in said series following the last register formed into said combination for controlling the. registers of said third registering device. 7

4. In a digit registering system, a sender having a plurality of individual code registers each capable of variably registering digits, a marker having a plurality of individual code registers less in number than the sender code registers each capable of variably registering digits, means in said sender responsive to pulses for operating diiTerent pluralities of said individual sender registers in successive order for registering different characters of oilice codes, said plurality depending upon the number of digits in each character of code, and means in said sender selectively operable by said registrations for invariably associating a number of said sender registers with said marker registers equivalent to the number of said marker registers. I

5. In a digit registering system, a sender having a plurality of individual registers each capable of variably registering digits, a marker having a plurality of individual code registers less in number than the sender code registers each capable of variably registering digits, means in said sender responsive to pulses for operating different pluralities of said individual sender registers insuccessive order for registering different characters of oiiice codes, said plurality depending upon the number of digits in each character of code, and selectively operable devices in said sender responsive to said registrations for connecting a set number of the sender registers on which the code is registered with said marker registers, said sender registers being combined in different orders to make up said set number of registers dependent upon the number of digits registered in an office code.

6. In a digit registering system, a sender having a plurality of individual registers each capable of variably registering digits, a marker having a plurality of individual code registers less in number than the sender code registers each capable of variably registering digits, means in said sender responsive to pulses for operating difierent pluralities of said individual sender registers in successive order for registering different characters of office codes, said plurality depending upon the number of digits in each character of code, selectively operable devices in said sender responsive to said registrations for connecting a set number of the sender registers on which the code is registered with said marker registers, said sender registers being combined in difierent orders to make up said set number of registers dependent upon the number of digits registered in an ofiice code, and means in said marker selectively responsive to the registers operated in the sender for directing the operation of said marker for associating the marker registers with difierent units of equipment.

7. In a digit registering system, a sender having a plurality of individual registers each capable of variably registering digits, a marker having a plurality of registers each capable of variably registering digits, a second sender having a plurality of registers each capable of variably registering digits, means in said first sender responsive to pulses for operating different pluralities of said individual sender registers in successive order for registering different characters of oflice codes, said plurality depending upon the number of digits in each character of code, means for registering other digits on the next successive registers following the registers used for said oifice code, means in said first sender selectively operable by said registrations for connecting a set number of the sender registers on which the codeis registered with an equivalent number of registers in the marker, and means for associating the next successive registers following the registers used for said office code with said second sender.

8. In a digit registering system, a sender having a plurality of individual registers each capable of variably registering digits, a marker having three individual registers. each capable of variably registering digits, means in said sender for registering oflice codes on three, four or five of said individual registers, respectively, and means in said sender for connecting different combinations of three of said sender registers with the registers of the marker for transferrin said respective oifice codes to the marker.

9. In a digit registering system, a sender having a plurality of individual registers each capable of variably registering digits, a marker having three individual registers each capable of variably registering digits, means in said sender for registering office codes on three, four or five of said individual registers, respectively, and means in said sender for connecting different combinations of three of said sender registers with the registers of the marker for transferring said respective ofiice codes to the marker, and means in said sender selectively operable by said registrations for directing the association of the marker registers with three-digit, four-digit or five-digit trunk routing equipment units.

10. In a digit registering system, a registering device having a plurality of individual code registers each capable of variably registering digits, a second register device having individual code registers less in number than the individual code registers in said first registering device, pulse responsive means in said first registering device, means in said first registering device variably responsive to said pulse responsive means for setting all or part of said plurality of individual code registers in said first registering device, and means in said first registering device responsive to said register settings for connecting a number of said individual code registers with the individual registers of said second registering device for transferring a code setting to the latter registers, the number of registers in the first registering device so connected being not greater than the number of registers in said second registering device.

WALTER B. STRICKLER.