US2447494A - Telephone register control system - Google Patents

Description

G. DEAKIN 2p447f494 TELEPHONE REGISTER CONTRL SYSTEM 7 Sheets-Sheet 1 A Y @S @h S wmm Aug. 24, 1948.

Filed April 2.1, 1944 R511 .s /V

I N V EN TOR. Gera/d MK/n y AGENT G. DEAKIN TELEPHONE REGISTER CONTROL SYSTEM Aug. 24, 1946.

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TELEPX'IIONE REGISTER CONTROL SYSTEM Filed April 2l, 1944 'f Sheets-Sheet 4 TABCDEF@ I N VEN TOR.

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TELEPHONE REGISTER CONTROL SYSTEM Filed April 21, 1944 7 sheets-sheet 5 tgv-' 04,6,7

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AGENT Patented Aug. 24, 1948 TELEPHONE REGISTER CONTROL SYSTEM Gerald Deakin, New York, N. Y., assignor to International Standard Electric Corporation, New York, N. Y., a corporation of Delaware Application April 21, 1944, Serial No. 532,141

13 claims. 1

This invention relates to new and useful improvements in register controlled telephone systems.

The object of the invention is to provide an arrangement in which an idle register controller is automatically connected with a link to which a line finder or other non-numerical switch has been started to connect a calling line.

According to a feature of this invention, the rst selector is operated simultaneously with the first digit switch of the register. 1f certain first digit or digits are dialled, e. g. if a local connection is desired, then the register is promptly detached, and the calling subscriber continues to control the establishment of the connection by directly operating the other selectors over the rst selector set by the register. If, however, the first digit indicates a different type of connection, e. g. an inter-office connection, then the first selector is released, and the register remains attached and controls the completion of the connection in accordance with the other impulses received from the calling subscriber.

In the drawings which diagrammatically represent as much of an automatic telephone System as is necessary for an understanding of the in- Vention:

Fig. 1 is a block diagram showing the relationship of the other figures to one another and to the rest of an exchange;

Fig. 2, the circuits of a Well-known line finder;

Fig. 3, the circuits of the link lbetween the line finder, rst group selector and the register;

Figs. 4, 4a and 4b, the register; and n Fig. 5, the circuits of a Well-known type of group selector.

GENERAL In the present system, a register controller such as the one described in detail in my co-pending application, Serial No. 521,160, led February 5, 1944, may, after simplification, be easily added to new or existing step-by-step systems where office prefix translation or register control is necessary or desirable. In step-by-step ofiices equipped with 20D-point nders like the one shown in Fig. 2, no change whatsoever need be made in the existing equipment other than to connect in the new equipment indicated between the vertical dotted lines in Fig. 1 and to remove the dialing tone from the first group selector (Fig. 5). A simple, two-relay selector link, referred to herein as an S-link (Fig. 3) is wired in between the 200- point finder and the first group selector. These S-links are connected in simple selector-register links, referred to herein as SR-links (Fig. 3), the purpose of which is to concentrate traflic upon groups of registers, thereby reducing the total number of registers to a minimum. The register circuit is shown in Figs. 4, 4a and 4b. The translator links are like the one shown in said application, Serial No. 521,160, filed February 5, 1944.

The registers and translating equipment may be added, so to speak, one first group level at a time, that is, while a register is picked up by every new call. It is immediately dropped after the dialing of the rst digit should it be unnecessary to translate the office prefix which was dialed to designate the first group level. To make this possible, the register operates lthe first group selector in parallel with the first digit switch. If translation is unnecessary, then the register drops off and dialing continues over the selected rst group level in the ordinary way. However, should translation be found necessary, then the rst group selector is restored to normal and the register takes full charge of the routing of the call.

OPERATION or CIRCUITS When a subscriber originates a call, a 200- point step-by-step nder (Fig. 2) is allotted and that finder grounds at a front contact of the A relay the p wire, thus placing a ground over back contacts of SBR and SAR, and resistor Rl (Fig. 3) on the T terminals of the S-link in the banks of the S-link finders of the SR-links. The common starting relay CSR (Fig. 3) is energized from the same ground on the p wire through resistors RI and R2 substantially simultaneously with the starting of the line finder. The wires leading to the first group selector are not disconnected at this stage because the 20G-point nder may reach the near terminals in its bank before an SR-link or the register is connected. Current is supplied to the line during this interval from the A relay in the first group selector (Fig. 5) but, as previously stated, the dialing tone is removed from the rst group selector and is not heard until a register is connected.

SR-linlc operates When CSR (Fig. 3) operates, it energizes the Pl power magnets of all idle S-link finders. The first link nder to select the calling S-link seizes it and makes it busy. Test relays TIR and T2R operate in the usual way and check for a double connection. T2R energizes P2 and causes the register finder to search for an idle register and when one is found, T3R and TIIR seize the register, make it busy, and check for a double connection, all in the usual way. 'MR operates RAR which closes the circuit of brushes A to G through to the register.

Register operates subscriber dials When the calling line circuit is closed over the A and Br brushes by RAR (Fig. 3), the stepping relay DR (Fig. 4) operates and energizes slow releasing relay RIR which, in turn, energizes XR (Fig. 4b) and slow releasing relay RCR (Fig. 4). The closure of the E brush circuit :by RAR (Fig. 3) closes the dialing tone circuit, which is heard by the calling subscriber.

RIR (Fig. 4) grounds the c wire and energizes SAR (Fig. 3) and RBR. SAR disconnects the first group selector from the calling line and in place thereof connects it over brushes F and G to a closed loop in the register, including the back contacts of DRI, RVR and RKR (Fig. 4). RBR (Fig. 3) opens the circuit of the common `starting lead and retains RAR energized. Relays. TIR and TZR release when SAR is energized. Relays T3R and TAR are released when RCR (Fig.`4) breaks its back contact.

When the subscriber dials, DR (Fig. 4) makes its back contact in the usual way and advances the digit switch DI (Fig. 4a) over terminal l brush A of PI. DRI (Fig. 4) operates in parallel with DI and' each time it opens its back contact, it opens the loop above referred to, and the rst group selector steps up one level. If, for instance, the digit 3 is dialed, then` digit switch DI is advanced to position 3 and the first group selector to level 3. `At the end of the rst series of pulses, PI (Fi'g; 4a), which has been energized over the front contact of RZR, is released and its brushes go to position 2. In case the register is retained, digit switches D2 to D6 or lD'l, depending upon whether six or seven digits are dialed, are advanced in the same manner as was digit switch DI;

Oce prefix translation not required For the purpose of this description, it is assumed (that office prefix translation will not be required when rst group levels, 1, 8, 9 and 0 are dialed. When` any of these four levels is` dialed, a circuit is established, when- PI (!Fig. 4a) goes to position 2 following the dialing ofthe rst digit,

from ground, brush C Iand'terrninal 2 of PI, brush AA and terminal t of PO, brush A of DI terminal I, 8, 9, or El, as the case may be, to brush D of the SR-link (Fig. 3). The grounding of brush D energizes SBR which opens the circuit of SAR and locksup -to the "p wire now grounded by the first gro-up selector. SAR releases and connects the calling line straight through the first to the secondl group selector or other trunk picked up by therst group selector. RBR, which is in series with SAR, releases and de-energizes RAR. RAR opens the brush circuits to the register and DR (Fig.l 4) falls away. DR releases RIR which releases XR (Fig. tb)` and slow releasing RCR (Fig. 4). XR. restores the digit switches to normal and when RCR makes its back contact, it restores PI to normal. When PI reaches position 1, |the test circuit of the register is again closed and the register is ready for the next call. The reason for making RCR slow is lto allow ample time for all switches other than PI to return home before vthe register is yagain placed in operation.

Oice prefix translated When Ithe first group digit dialed is 2 .to 7, the following 4circuit is closed whenr PI goes `to posi- 4 tion 2: from ground, brush C, terminal 2 of PI, brush A terminal I of PO, brush A of DI, tenninals 2 to one winding RVR, brush D of PI, terminals 2 to '5, winding RTRI, back RTRZ to battery. RVR (Fig. 4) operates, locks up and opens the loop holding the first group selector, which releases and returns to normal. RTRI (Fig. 4a) calls in a two-digit translator link as described in detail in application, Serial No. 521,160, led February 5, 1944, and the two or three-digit oce prex, as the case may be, is translated bythe translator link into two, ,three -or four successive selecting operations, as required.

Pulsz'ng We will assume that a six-digit number Iis being dialed, which comprises a ltwo-digit cnice preiix. When translation is complete, RTR3 (iFig. 4c) operates and a circuit is established from ground, front RTRS, terminal I, brush B of PO, back and winding RVR (Fig. 4) to battery. RYR operates and locks up over a front contact of RCR. RYR places high tension battery on the .triode circuit and closes the trunk loop, circuit from ground, one winding of the A relay of the rst group selector (Fig. 5), brush -G of .the SR-link (Fig. 3), back RKR, in multiple with brush B, terminal I of PT (Fig. 4d), rectifier S(-I) (Fig. 4), winding of relay PR( I-) `front RYR, fron-t RVR, back DRI, F brush, other winding of A relay of the iirst gro-up selector to battery. The A relay ofthe first group selector and PR(-I)l of the register operate in series. PR(I) closes the circuit of RKR from ground on the B brush of PO, front RYR, back GVR, back GSR, front PR( win-ding lRKR, 10- cycle interrupter to battery. When the live segment oi the interrupter closes the circuit of RKR, the latter `operates and energizes the magnet PT of :the marker switch and of relay RJR. RJR locks up over .the back contact of GVR and GSR and short-circuits PR( -i-) and the rectiiiers. PR(-I) releases but not before its front contact is short-circuited by RJR.

When the interrupter opens the circuit of RKR, PT is4 released-and its brushes A and B go -to posi- .tion 2, in which brush B removes the short circuit from the pulsing contact of RKLR. The purpose of ,thus short-circuiting the first pulse is to ensure the full length of the iirst pulse sent out over the trunk loop.

When the interrupter closes the circuit of RK-R for the second time, PT is again energized and the trunk loop is opened at the back contact of RKR, thus causing the rst group selector to step up one level.

These operations continue until the required number of pulses 'have' been sent out. Assume, for example, that three pulses are to be sent out. PT will go to position 5 when RKR releases after the third pulse. Brush A of PT in position 5 places potential PNB on the grid of V2, which potential vis also placed on the grid of VI by the translator. Gas valve GV rires in the usual way and operates GVR. GVR opensl the circuits of RKR and RJR, the latter releases and the former is not again energized when the interrupter next closes the battery' circuit. RKR restores over a back Contact PT .toits home position.

GVR operates slow releasing relay GSR. GSR energizes PO and opens the high tension battery circuit which de-ionizes GV and releases GVR. GVR releases GSR and when GSR breaks its front contact, PO goes to position 2.

The first group'selector may' pick up the second group selector or other trunk before or after PO goes .to position 2. The second selector is held energized by lthe fundamental circuit loop which again includes PR(+) sinc-e RJR is not now energized. As long as the circuit of the B brush of PO is held open at the back contact of GSR, RKR cannot be operated and pulses therefore are not sent out. However, when .GSR breaks its front contact and makes its back contact, the circuit of relay RKR is again closed, this time over terminal 2, brush B of PO, and brush A, segment I/ II of D2. GSR is made su-ci'ently slow releasing so as .to lallow ample .time for the change-over inthe step-by-step selector which normally takes place during the long closure of the line between the dialling of the digits.

The second, third or four-th series of pulses of the office prex, as the case may be, are sent out in the same manner as .the rst series. When relaysRTRd and RTRS (Fig. 4a) are energized, .the loliice prex consists of four selections. When `only RTRE is energized, the ofce prefix cons-ists of .three selections and when nei-ther of the relays is energized, the oili-ce prefix consists of only two selections.

After the oiiice prefix selections have been made, PO goes to position 5 and the B brush of PO from now on -is grounded direct by brushes A of the digit switch D3 .to D6. The four selections of the office number are made by the pulsing circuit in the same manner as ythe oliice prefix selection. Upon completion of Iall selections, PO goes to position 9 and the lD brush of the SR-link is grounded lby the A brush of PO. SBR (Fig. 3) of the S-link is energized which releases .SAR and RBR of the SR-link. SAR connects the calling line through to .the Icompleted connection for ring- -ing or busy tone, as the case may be. The SR- link is released when RBR breaks its front contact and rele-ases RAR. The opening of the line circuit releases DR ('Fig. 4) which releases RIR which, in turn, releases XR and RCR, after which al1 switches and relays in the register return to normal.

In case a seven-digit number is dialed, RTRZ (Fig. 4b) is energized and, in turn, energizes RTRB (Fig. 4a), which locks up, RTRG transfers the release circuit over brush A of PO, from terminal 9 to terminal I0, whereby on a sevendigit call, the D brush of the SR-link is not grounded until after the seven dialed digits have been disposed of.

Out-tranlcz'ng to universal oice Out-trunking to a universal folice, i. e. one in which the switches are controlled over a multipotential fundamental circuit, is done in the same manner as out-trunking to a step-by-step oce with this exception, that the trunk Wires to a universal oice are reversed until a T-register thereat is connected. The initial trunk loop is closed through rectier S(-) (Fig. 4) and resistor R. PR(+) is not energized until the distant T-register is connected, at which time current is reversed. From there on the register (Figs. 4-4b) operates as on a call to a step-by-step office.

11i-dialing to automatic P. B. Xs

The register, Serial No. 521,160, filed February 5, 1944, is arranged for in-dialing to an automatic P. B. X. The present register is not so arranged but such in-dialing may be done by waiting for the P. B. X dialing tone which follows after the A-register (Figs. 4-4b) is released. In order to have only one set of instructions in the directory for dialing into P. B. X's in a mixed network, the

III)

register of the last-mentioned application may .bei easily changed to reconnect the dialing tone aA second time just after dialing the-P. B. X conversion number. This dialing tone would always be received immediately after dialing the P. B. X number; there would be no delay.

False calls Relay 'IARI (Fig. 4) is included in the initial control loop of the rst group selector. Should the subscriber fail to dial within 20-40 seconds, relays TAR2 and TAR3 will operate. TAR3 grounds terminals I and 2 of bank B of PO. Digit switches DI and D2 in their home positions apply potentials PNS and PNI, respectively, to terminals I and 2 of the C bank of PO. Thus, when TAR3 operates, the call is automatically extended to No. 91, after which the D bush of the SR-link is grounded by brush D of PO when PO goes to position 3. The register and SR-link release. The number "91 has been arbitrarily chosen; any other two-digit number may be cross-connected to the B banks of DI and D2.

What I claim is:

1. In a telephone system, a plurality of lines, means including normally inactive non-numerical and numerical switches for connecting a calling with a called line, a link between said switches, a plurality of registers adapted to be set by calling lines for controlling the operation of the numerical switches, normally inactive switching means for connecting an idle register with a non-numerical and a numerical switch, and means operable upon the initiation of a call for substantially simultaneously starting a non-numerical switch andthe switching means to establish a connection between the calling line and a numerical switch and between an idle register and the last-mentioned connection.

2. The system according to claim 1, characterized in that the non-numerical switch is a line finder.

3. The system according to claim 1, characterized in that the switching means includes a plurality of link finders adapted to hunt for the lastmentioned connection.

4. The system according to claim 1, characterized in that the switching means includes a plurality of register finders adapted to hunt for an idle register.

5. In a telephone system, a plurality of numerically designated lines, means including a plurality of selectors for connecting a calling with a called line, a plurality of registers variably operable by a calling line in accordance with the digits of the called number to control the setting of the selectors, one after the other, to establish the desired connection, means operable upon the initiation of a call for connecting an idle register with the calling line, means operable when the called number comprises certain combinations of digits for releasing the connected register after the setting of all the selectors, and means for releasing the register after the setting of the rst one of the selectors if the called number comprises a predetermined digit.

6. In a telephone system, a plurality of numerically designated lines, means including a plurality of selectors for connecting a calling with a called line, a plurality of registers, each having a plurality of digit switches variably operable by digits of the called number dialed over the calling line, switching means for connecting an idle register with a calling line, means in the registers to connect the associated digit switches, one after 7 theI other', with'v successive: selectorsr .to controlf their setting, means for releasing the connectedy register after the setting of all the selectors, means in the register for simultaneously setting tlie rstselector with the rst digit switch, means operable in response to a'ilrst' digit ofi al certain numerical value for releasing the connected register upon the receipt of the rst digit from the calling line, and means operablethereupon' and controlled directly by the additional digitsdialed over the calling line for controlling the setting of 'the' otherselectors` overtheoperated first selector.

7. The system according to claim 6, character ized in that the selectors are-'step-by-step selectors' responsive to directive impulses, and means inthe register for repeating and sending to the selectors impulses corresponding to the digits dialed over the calling line.

8; The system according yto claim fcharacter'-` ized by means in the register operable after the setting of the iirst selector in accordance with a digit of another numericalvalueiorlrel'easing the first and then setting otherfselectors to esitablish the connection.

9; The system according to claim 6, characterized by a translator, means for associating the translator with the register to control the setting of the selectors in accordance with digits dif-` ferent irom but bearing a predetermined relationship to the digits dialed by the calling line, the last-mentioned means being operated only in response to the dialing of a predetermined first digit of other than said certain numerical value. f

10. The system according to claim 6, characterized in that a relay associated With the rst selector has contacts for connecting the calling line with the first selector and contacts for connecting the register with the iirst selector', and a circuit for said relay controlled by: the connected register.

11. The systemaccording to claim 6, characterized in that a relay associated with thefirst selector has back contacts over which the calling line, and front contacts overiwhich the register isv connected 4with the iirst selector, and means controlled over a back contact of said relay for operating the switching meansvt'o connect' an idle register with the calling line and With said front contacts.

12, In a telephone exchange system, a. plurality of subscribers lines, means including groups of line finder and selector switches for connecting a calling with a called'line, each of said switches having a bank of terminals and a set of Wipers cooperating therewith, the subscribers lines terminatingin the banks of the line finders, a linkconnecting the wipers of each finder with the Wipers of a selector, a plurality of registers, a hunting switch for connecting anv idle register with a link, means operable upon the initiation of a callr for simultaneously starting a iinder and the hunting switch, means controlled by the calling subscriber for operating the register in accordance with the called numberJ means including a fundamental circuit controlled by the register for operating the selector for establishing the connection tothe called line, a relay in each link controlling the continuity of the link and the connection of the fundamental circuit therewith, and a circuit for said relay controlled by the connected register.

13. In a telephone exchange system, a plurality of subscribers lines, means including groups of line nder and successive stages of numerical group and final selector switches for connecting a calling with a called line, each of said switches having a bank of terminals and a set of wipers cooperating therewith, the subscribers lines terminating in the banks of the line nders and final selectors, alink connecting the wipers of each iinder with a rst group selector, a plurality of registers, a plurality of hunting switches for connecting an idle register with a link, means operable upon the initiation of a call for simultaneously starting a line finder and said hunting switches to connect over a line finder and a hunting switch an idle register with the calling line, means controlled .by the calling subscriber over the last-mentioned connection for operating the register in accordance with the called number, means including a fundamental circuit controlled by the register for successively operating the group and iinal selectors for establishing the connection to the called line, a relay in each link having back contacts over Which the rst selector and line iinder wipers are normally connected, front contacts for said relay over which the fundamental circuit is -connected With-thedrstfselector, andan energizing circuit for. saidrelay controlled by the selectedfregisten GERALD DEAKIN.

REFERENCES CITED 'Tiiefollowing references are ofrecord in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,567,072 Matthies Dec.' 29, 1925 1,708,949 Matthies Apr. 16, 1929 1,854,106 Carpenter April 12, 1932- Disclaimer 2,447,494.-G'erald Deakin, New York, N. Y.

SYSTEM. Patent dated Aug. 24, 1948. the assignee, International Standard Elect TELEPHONE REGISTER CONTROL Disclaimer iled Apr. 19, 1949, by MIG Corporation.

Herely enters this disclaimer to claims 5, 6, and 7, in said specication.

[ jc'ial Gazette, May 17, 1.949.]

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