US2259101A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2259101A
US2259101A US335240A US33524040A US2259101A US 2259101 A US2259101 A US 2259101A US 335240 A US335240 A US 335240A US 33524040 A US33524040 A US 33524040A US 2259101 A US2259101 A US 2259101A
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United States
Prior art keywords
relay
conductor
circuit
contact
winding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US335240A
Inventor
Richard C Davis
James B Newsom
Walter B Strickler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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Filing date
Publication date
Priority to FR961957D priority Critical patent/FR961957A/fr
Priority to NL70952D priority patent/NL70952C/xx
Priority to BE483523D priority patent/BE483523A/xx
Priority to US335240A priority patent/US2259101A/en
Priority to US335245A priority patent/US2259100A/en
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US335241A priority patent/US2261370A/en
Priority claimed from US335245A external-priority patent/US2259100A/en
Application granted granted Critical
Publication of US2259101A publication Critical patent/US2259101A/en
Priority to GB509048A priority patent/GB656562A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Definitions

  • a T mlm/EV case gives the identity of the office.
  • This invention relates to telephone systems and has for its object to facilitate the handling of calls requiring the services of an operator.
  • the talking circuits are freed of these sources of difficulty since instead 1of carrying the talking circuits through the centralized oice, the functions vof the vregistering ⁇ equipment or senders have been divided into two parts, one .performed at the switching omce and the other performed at the A:centralized oflice, the two parts of the sender being permanently .connected by a lset of four conductors.
  • the incoming trunks or junctors have access to more than one office
  • means is provided to inform the calling .operator .that the office designation is required.
  • the B operator is also pro- ,vided with means for indicating to the sender to which of the offices the call is directed and the 'sender is provided with means for combining these indications into an .office indication to the marker.
  • the B operator Vreceiving this information gives a discriminating indication to the centralized sender which 4passes this 'information to the terminating sender by to make selections in the proper ofce.
  • Fig. 1 shows 'in diagrammatic form 'an originating office, a plurality ⁇ of incoming junctors, terminating switches and a plurality of called lines. In addition, 'it shows apart of the sender link;
  • Figs. 2, 3, 4, 5 vand '-Z V show Apar-ts of ,the sender at the .terminating oiiice, Figs. 2 and 5 showing the connection control relays, Fig. 3 showing the pulsing and counting relays, and Figs. 4 and 7 showing a cross-bar type :register:
  • Fig. 6 shows the-operators position at the vcentralized cnice
  • Fig. 8 shows fa ⁇ part :of the marker
  • Figs. 9, 10 and '11 show the recorder and position :finder circuit located at the centralized .ofce, Fig. 9 showing .the position iinder, Fig. 10 showing the steering relays and the .counting relays, Fg. 11 showing the register relays; and
  • Fig. 12 shows the manner in which Figs. 1 to 1-1 should be arranged.
  • the .B operator 'then .sets up the number on her key-set 640 controlling thereby the registers
  • the B operators position is released and the number is transmitted by means of revertive pulses to the terminating sender where it is recorded on the cross-bar register of Figs. 4 and 7.
  • the number is then transferred to the terminating marker of Fig. 8 which selects the wanted line, sets up and tests a connection between the incoming junctor and the Wanted line and then releases the sender which will, in turn, release the marker.
  • 00 have access to the incoming and line switches shown at
  • 04 represent a group of incoming junctors from an originating cnice
  • Incoming junctors are arranged in groups and are connected with senders by means of the sender link H0.
  • each junctor of a group operates a group start relay such as relay H2 or H9 which brings about the connection of the link circuit to the group of junctors by the group relay H3 or
  • a group start relay such as relay H2 or H9 which brings about the connection of the link circuit to the group of junctors by the group relay H3 or
  • -grounding of conductor H6 indicates a junctor ⁇ terminating in oiice B, while the grounding of conductor H indicates a junctor having access to either ofiice A or ofce B.
  • the link control circuit When the switches of link H0 are ready for ⁇ operation the link control circuit connects ground to conductor III operating relay 500 in the selected sender.
  • Relay 500 extends its operating ground over its inner upper front contact, conductor 56
  • the identity of the frame on which the in- -coming junctor is located is recorded by grounding one of conductors 506 or 501 and one of the upper ten conductors leading to armatures of relay 502. Assuming that the frame on which the incoming junctor
  • Relay 190 is marginal and does not operate unless, due to some difficulty, an attempt is made to operate more than one select magnet.
  • Magnet 104 extends its operating ground over conductor 10
  • Relay 300 operates and extends ground from conductor 302, over its outer upper front contact to the normal contacts and Winding of relay 202, resistance 203 and battery.
  • Relay 202 operates, locking directly to conductor ⁇ 302, and preparing a circuit for relay 204 from battery through resistance 205, winding of relay 200, front contact of relay 202 to conductor 302. However, relay 202 does not operate, being shunted by the operating circuit for relay 202 which extends over the upper back contact of relay 204 to resistance 205.
  • the link control circuit tests the holding circuit between the sender and the link switches by operating the switches over a circuit including conductor 5
  • Relay 206 at its third lower front contact connects ground to conductor 302 to provide a holding circuit for relays 30
  • Relay 206 at its inner upper front contact connects ground to conductor 2I8, marking the sender busy to the link control circuit.
  • the link control circuit tests, to determine if one and only one frame registration has been made and if an office registration has been made, by connecting ground to conductor 2 I0.
  • the grounding of conductor 2I0 completes a circuit over the second lower front contact of relay 206, outer upper front contact of relay 208, outer upper back contact of relays 2H and 2I2, outer upper front contact of relay 202, conductor 102, back contact of relay 190, conductor 303, back contact of frame tens relay 304, conductor 209 through cable 505, ⁇ to- ⁇ the winding of relay 200 and battery.
  • Relay 200 locks over its .inner lower ⁇ front contact and conductor 2
  • the link control circuit responds to ground on conductor 518 by opening the circuit of relay 500 which now releases.
  • the sender now remains connected with Athe y junctor by means of conductors 2
  • Relay 206 connects ground to conductor 2I9 to provide locking circuits for relays V200, 208, 2II, 2
  • relay 200 Upon grounding conductor 5
  • Relay 230 signals the centralized sender over the four conductors which vconnect the terminating sender with the centralized sender. To do so, it connects polarized relay 225 between the right windings of repeating coil 226 which is, in turn, connected by conductors 221 and 228 through cable 229 to repeating coil 9
  • relay 230 prepares the fundamental circuit for receiving the designation from the centralized sender by connecting conductor 232 over the inner upper contact of relay 230, inner upper back contact of relay 2-
  • Conductor 233 is connected over th-e middle upper contact of relay 230, outer lower back contact of relay 2
  • relay 200 One of the circuits closed by relay 200 is a locking circuit for select magnet 104 and relay 300 which extends over the inner upper and lower front contacts of relay 300, conductor 305, back contact of relay 220, conductor 222 to ground at the inner upper front contact of relay 200.
  • a parallel circuit extends over the middle right back contact of relay 306, conductor 3 01, inner upper back contact of relay 520 to conductor 222.
  • relay 202 When relay 202 was operated as previously deframe vertical on the register switch over the 4 scribed, it connected the hold magnet 4I0 of the ⁇ ate with the current which iiows through the two windings in series or with the hold magnet kconnected to the two windings. However, the hold magnet 4
  • relay 502 When relay 502 released, a circuit was closed from battery through resistance 52
  • relay 200 When relay 200 operates, grounded conductor l5
  • a relay in the junctor operates and locks and the locking ground for the junctor relay, extending back over conductorr5l9, causescurrent to flow through relay 522 in the operating direction.
  • Relay 522 in operating closes a circuit from grounded conductor 5
  • relay 225 across the conductors 221 and 228 closes a circuit in the centralized sender from battery through the lower winding of relay 9I2, outer lower back contact of relay 9
  • 2 operates and closes an obvious circuit for relay 9 I3.
  • relay 9I3 starts the position nder hunting for an idle operators position by closing a circuit from battery through the winding of relay 9I4, upper back contact of relays 9I5 .and 9
  • 4 closes a circuit from battery through the lower winding the winding of relay 963, back contact of steppingrmagnet 301, inner lower back contact of relay 919, outer front contact of relay 914, lower back contact of relay 916, upper outer contact of relay 918, upper normal contacts of relay 915 to grounded conductor 929.
  • Relay 998 operates in this circuit and at its left Contact closes a circuit from battery through the winding of magnet 901 to the operating circuit of relay 906. Magnet 901 operates, opening the circuit of relay 999, which releases in turn releasing magnet 991 to step the brushes of position nder 900. The release of magnet 901 recloses the circuit of relay 998 and the same cycle is repeated until an idle position is found.
  • Relay 916 locks in a circuit from battery on conductor 699, brush 996, inner back contact of relay 916, outer upper contact of relay 911, middle winding and upper front contact of relay 916 to grounded conductor 929.
  • Relay 919 releases relay 914 and when relay 914 closes its back contact, a circuit is completed from battery through the winding of relay 919, resistance 921, back contact of relay 914, lower front contact of relay 916, outer Contact of relay 918, normal contacts of relay 915 to grounded conductor 929.
  • Relay 919 operates, closing a circuit from battery through the winding of relay 915, inner lower front contact of relay 919, outer upper back contact of relay 919, upper normal contacts of relay 915 to grounded conductor 920.
  • Relay 915 locks over its upper alternate contacts to conductor 920 and closes a holding circuit for relay 919 under the control of relay 916, In addition, relay 919 closes a circuit from battery through the winding and normal contacts of relay 911, middle lower front contact of relay 919, brush 905, conductor 922, left back contact of relay 691 to the winding of relay 608 and ground. Relay 911 is marginal and does not operate but relay 608 operates. Relay 608 closes a circuit from battery over the inner left front contact of relay 604, conductor 612, contact of relay 698 through lamp 699 to ground through interrupter 610 to warn the operator that her position has been seized.
  • Relay 915 closes a circuit from battery through the winding of relay 923, lower front contact of relay 915, outer upper back contact of relay 1000, outer upper back contact of relay 911 to ground over conductor 929.
  • Relay 923 connects the outer ends of the upper windings of repeating coil 919, over brushes 991 and 992, conductors 921 and 928 to the position circuit.
  • the inner end of the upper right winding of coil 910 extends through the upper windings of polarized relays 924 and 925, inner upper back contact of relay 911 to ground over the outer lower back contact of relay 1090 and through resistance 1001.
  • 'Ihe inner end of the upper left winding of coil 910 extends through the lower windings of relays 924 and 925 to battery over the outer lower front contact of relay 913 through resistance 926.
  • circuit conductor 921 extends through the windings of relay 611 to conductor 928. Therefore, relay 611 operates and at its right contact extends conductor 928 over the outer right back contact of relay 613 to the secondary winding of tone coil 614. Conductor 921 extends through condenser 615 over the outer left back contact of relay 613 to the other side of the secondary winding of tone coil 614. Relay 611 at its left contact closes a circuit from battery on conductor 612 to the winding of relay 629 and ground.
  • Relay 629 operates and closes a circuit from tone source 616, inner left front contact of relay 629, left back contact of relay 611, right back contact of relay 618, primary winding of tone coil 614 to ground at the inner right back contact of relay 613, thereby transmitting a tone over the conductors 921 and 928, brushes 901 and 902, through repeating coil 910, conductors 221 and 228, through repeating coil 226, contacts of 'relay 266, conductors 214 and 215 and thence to the position of the A operator.
  • the operator of Fig. 6 may also hear the tone through condensers 620 and 621.
  • Relay 629 also closes an obvious circuit for relay 691 and completes a circuit for relay 619 which may be traced from battery through the winding of relay 619, right back contact of relay 611, conductor 622, outer left contact of relay 629, to ground at the outer right front contact of relay 604.
  • Relay 601 disconnects conductor 922 from the winding of relay 698 permitting relay 608 to release and disconnect battery from lamp 699. With relays 629 and 601 operated, a circuit is closed from battery through the winding of relay 618, right front contact of relay 691,
  • Relay 61'8 is slow to operate and, after an interval, opens the circuit through the primary winding of tone coil 614, thereby interrupting the tone.
  • Relay 618 closes a circuit from battery through the left winding of relay 602, left front contact of relay 618 to ground on conductor 622.
  • Relay 692 locks through its right winding and ⁇ inner right front contact to ground at the outer right contact of relay 629 and extends its operating ground to the winding of relay 623.
  • relay 602 reconnects lamp 609 over the outer left front contact of relay 692, left normal contacts of key 693 to battery on conductor 612.
  • Relay 623 operates and recloses the primary circuit of tone coil 614 which now vextends over the right front contact of relay 618 and the outer left front contact of relay 623 instead of over the back contact of relay 618. A second tone is therefore transmitted to the A operator.
  • Relay 623 also closes a circuit from ground on conductor 622, inner contact of relay 623 through the winding of relay 611 and battery.
  • Relay 611 is also slow to operate and after an interval again opens the primary circuit of the tone coil to interrupt the second impulse of tone.
  • relay 611 closes a circuit from ground on conductor 622, right front contact of relay 611, left back contact of relay 624 to the winding of relay 613 and battery.
  • Relay 613 operates, locks over its left alternate contacts to ground on conductor 622, short-circuits condensers 620 and 621 and connects ground over its right alternate contacts to lamp 609 in shunt aasaior of. interrupter 6I0 whereby lamp 609 glows steadily to 'inform the operator ⁇ that she has been con-- nected to the A. operators position.
  • the A operator then passes the wanted number to the B operatorand the B operator operates4 the. keys of her key-set to record the number given. Assuming that the called. number isV 3674 the B operator will operate keys 633, 636, 631 and 634 in succession.
  • the sender and the key pulsing circuits are prepared for operation. by the establishment of three registering circuits.
  • the operation of relay 602 disconnects battery from conductor 609- thereby releasing relay 9-I6 which in turn releases relay 9I9.
  • relay 9I9 released, the first registering conductor 922 is disconnected from relay 91.1 and connected over the middle back contact of relay 9I9, outer right front contact oi relay 923,.
  • relay 9-I9 also extends the second registering conductor 930 from brush 904, middle right contact of relay 923, outer back contact of relay 9IY9, conductor 932 through the winding of relay H00 and thence to vground as traced from the winding of relay II03.
  • the third registering conductor 93I' extends from brush 903, inner right front contact'of relay 923, conductor 933, through the left winding of relay H02 but the circuit ⁇ is incomplete'at this time.
  • conductor 922 extends over the left front contact of relay 601, conductor 56
  • Y extends through the winding of relay 64I, leftYback contact of relay 642, right backl contact of relay- 643 to ground over key 644.
  • Relay H00 and. H03 operate the circuits above traced'.
  • Relays H00and H03 close. a circuit from ground atthe inner upper front contactof relay- 9513, conductor 934, front contact ofrelay- I'Illil-iront contactof relay H03, through the lower lwinding of relay I IOI and battery.
  • Relay HI operates in this circuit, opening the circuit of relay H02 and the register relays which release. It also ⁇ closes a holding circuit for itself'from battery in the position circuit, through the windings of relays H00 and H03. as tracedyalternate contacts and upper winding of relay Htl-I, vconductor 935 to ground at the second upperiront contact of relay 903.
  • Relay H- ⁇ 0I also closes; 'a circuit 'from ground on conductor 934, upper front contact vofr relay IIOI, windings of relays IjlilV and HI5 to battery ⁇
  • Relays IH5 and H-I' operate, relays HI'B closing at its left Contact a 'locking' circuit for the two relays to ground onV conductor 934.
  • At its right contact rel-ay H49 also closes a circuit from grounded conductor-'934 to the windings of relays H26 and i'I25a/nd battery.
  • Relays H25 and H26 operate, relay'll26 closing a locking circuit for itself and an operating circuit for relays H36 and H35.
  • Relay H36 locks vrelays H35 and H36 to conductor 934' andy operates relay H46 ⁇ through resistance H41., kRelay H49. lalsolocks to ⁇ conductor934..
  • Relays 64I and. H02 operate in this. circuit but relay H02 is. ineiective at this time, Relay 64I closes a locking circuit for itself over itsouter left contact to ground on conductor 622 Y and extends this ground over its inner left contact to the winding," of relay 642 and battery on conductor 629.v Relay 642 locks over its let front contact and right back contact of relayV 643 to ground on key 644,"opens the operating circuit for relay. 64Iv and closes a circuit from batteryv through Vthe lwinding. of relay 621,.
  • relay HOI connects ground fromconductor 934 over the inner upper backcontactoi relay I IOI to conductor I I50,.there by completing a cir-Y cuit oyer the right front contact of relay H46 to the winding of relay H45 and battery.
  • Relay H45 locks to conductor H50, disconnects battery from conductor 933 and extends that conchlctorv to4 ground-at, the .outer upper backl contact of. relay II0I. ⁇
  • Conductors 662 and 663 extend. as previously traced to conductors 932 and 933, respectively.
  • Conductor 932Y extends through the winding, of relay H00, normal contacts of relayv Hill, right winding of relay H02, lower. alternate contacts of relays H35, H25 and HI5, upper windingof relay I I I3, lower winding of relay-I I I2 to; ground, while conductor, 933 ex- ⁇ tends throughthe left winding of relay I I02, up.
  • relays ⁇ H35, I IE5 and I H5 per alternate contacts of, relays ⁇ H35, I IE5 and I H5, upper winding of relay IH4, outer upper front contact of relay I
  • Relays H00 and H02 ⁇ operate. ⁇ Since onlylow resistance649 was included in thecircut over conductor .932, marginal ⁇ relay ⁇ HI3 operates in that circuit as well Aas relay H,I.2, and -since only low resistance 646 was. included in the circuit over conductor 933, relayl I I4'operates.. The operation of relay H35 and H25, inner lower front contact of relay III5, winding of relay HII and battery. Relays HH,
  • relay H02 closes a circuit from grounded conductor H50, front contact of relay H 02, outer lower front contacts of relays H35 and H25, inner upper front contact and winding of relay III5 to battery.
  • This circuit is in shunt of relay
  • relay H24 Since high resistance 641 was included in this circuit, relay H24 does not operate.
  • Relay H02 in operating closes a circuit from ground on conductor H50, front contact of relay H02, outer lower front contacts of relays H35 and H25, inner upper back contact of relay II I5, to the winding of relay H25 and battery.
  • Relay H26 is shunted by this circuit and releases, relay H25 being held operated until the key is released at the key-set when relay H25 also releases, transferring the registering circuits to the tens register H30.
  • relay H02 completes a circuit from grounded conductor H50, front contact of relay H02 over the ⁇ lower back contact of relay
  • relay H46 released, as soon as relay H02 closes its back contact at the end of the pulse, a circuit is closed from grounded conductor I
  • 000 locks over its outer upper front contact to grounded conductor 034 andV prepares for the transfer of the designation from the centralized sender to the terminating sender.
  • 000 operated, disconnects ground from the windings of relays 024 and 925 thereby opening the circuit of relay BH which releases, disconnecting battery from conductor 028 and releasing relays 642 and 029.
  • relay 620 released relays 601 and 602 also release and ground is disconnected from conductor 622 thereby releasing relay 6
  • the release of relay 602 restores the connection of battery through resistance 00
  • 000 opens the circuit of relay 923 disconnecting the position nder from the centralized sender circuits.
  • 000 in operating also disconnects the conductors 232 and 233 from the winding of relay
  • This circuit was prepared when relay 9
  • 005 operates in a circuit from battery through its winding, back contact of relay
  • 000 locks over the inner upper back contact of relay
  • 0 closes a circuitA from batteryithrough thc winding of relay 308, middle upper front contact of relay 300, which has been held operated following the registration of the frame designation, outer right back contact of relay 306 to ground at the front contact of relay 3
  • Relay 308 locks to the front contact of relay 3
  • 4 closes a circuit from ground over the outer upper front contact of relay 5
  • Relay 530 closes a circuit from ground over its lower contact, normal contacts of jack 53
  • 3 closes a holding circuit from battery through its winding, right winding of relay 3
  • Relay 530 at its upper front contact connects ground to conductor 234 thereby holding relay At the terminating sender the operation of relays 308 and 300 connects ground to the right armatures of relay 3
  • 2 operates in the holding circuit of relay 3
  • operates and locks over its inner right front contact, normal contacts of relays 322, 323, 324 and 325, outer right front Contact of relay 305 to ground over conductor 301.
  • a parallel locking circuit extends from the contact of relay 325 over the up'-v per normal contacts of relay 300 to groundedy conductor 22
  • grounding conductor 532 closes a circuit over the left front contact and left winding of relay 3
  • 4 opens the operating circuit of relay 3
  • a circuit is then closed from ground over the right back contact of relay 3
  • Relay 322 locks over the chain circuit previously traced, opening the locking circuit for relay 32
  • 3, 3M and 312 Subsequent operations of relay 530 cause relays 3
  • the third, fourth, fifth and sixth' pulses operate relays V323, 324, 325 and 323, respectively.
  • Relay 325 locks over the back contact of relay 32
  • Relay 326 locks through its right winding and inner right front contact over the outer right front contact of relay 300 to conductor 301 independent of the other counting relays and therefore re-f maining operated during any subsequent pulses.
  • the seventh, eighth, ninth and tenth pulses operate relays 32 322,l 323 and 320, respectively, relay 32
  • the regular terminating sender is arranged to receive the wanted number from the originating sender in the forro of three selections known as incoming brush, incoming group and nal brush selections, which are translated from the thousands and hundreds digits of the Wanted number, followed by nal tens and final units selections corresponding directly to the tens and units digits of the wanted number. Therefore, in order to provide for theY simple modification of terminating sendersv to work with a centralizedY B operators equipment or vice versa, the terminating end of the present sender is likewise equipped with a cross-bar register having ve verticals for receiving five selections and translating them into a numerical de's'igriationv for transmission to the marker.
  • locks through thewnding of relay
  • relay 530 operates, shuntingthe stepping relays of the two senders, relay
  • 004 to reoperate the counting relay circuit extends, as above tra-ced, tothe upper armature of relay
  • 0 operates, lock-ing through the windings of rel-aysl02-1 and
  • 020 operatev in this locking ci-rcuit.- The operation of relay
  • 020 closes a circuit from ground atl its contact over the lowerlcack contacts of lrelays
  • 032v closes ai locking circuit for i-tself through the winding of relay
  • 032 also closes acircuit from grounded conductor 934, outer upper front contacter" relay
  • 028 further opens the fundamental circuit and disconnects grounded conductor 030 from the oping that relay torelease and open the fundamental.A circuit at an additional point.
  • 028 alsoopens theoperating circuit of relay
  • 000 opens the locking circuit of lthe counting relays and these relays release.
  • 020' permits relay
  • opens the cir- Vcuit of relay
  • the two revertive pulses which satisfy the centralized sender cause the ope-ration of relays 32
  • 0 in turn releases relays 308 and 303.
  • relay 306 released, a circuit is closed from ground at the lower back contact of relay 534, conductor 535, lower normal contacts of relay 300, right back contact of relay 320, first left back contact of relay 306, outer left front contact of relay 322, conductor 33
  • prepares the crosspoints at the No. l level of the register switch and extends its operating ground to the winding of relay A300 as previously described.
  • Relay 300 locks over the back contacts of relays 220 aind 306 as before, thereby also locking the select magnet 10
  • Relay 300 connects ground on conductor 302 over the upper front contact of relay 204 to resistance 203 and battery in shunt of the winding of relay 202 which thereupon releases.
  • Relay 204 is held operated over the normal contact of relay 202 after that relay releases. With relay 202 released and relay 204 operated, the windings of relay 220 are connected over the lower front contact of relay 204, lower back contact of relay 202, conductor 230, outer upper contact of hold magnet 4
  • closes cross-point 112 and locks over its inner upper front contact, conductor 42
  • the closure of this locking circuit extends ground back to the upper winding of relay 220 causing that relay to operate opening one locking circuit for relay 300.
  • 0, 308 and 306 reoperate and relay 300 releases, in turn releasing relay 204.
  • the remaining selections are performed in essentially the same manner, relay 300 operating relays 202 and 204 on alternate selections and releasing them on the following selections.
  • the counting relay circuit extends as previously traced to the armature of relay
  • 035 With relays
  • Two pulses satisfy the centralized sender resulting in the closure of cross-point 114 at the terminating sender.
  • the nal tens selection takes place with relays
  • the counting relay circuit extends as traced to the back contact of relay
  • the first two pulses permit relays
  • the third pulse permits relay
  • 5 in operating releases relay
  • the fourth, fifth, sixth land seventh pulses relays
  • eight revertive pulses operate relays 32
  • the select magnet circuit extends from grounded conductor 535, lower normal contacts of relay 300, outer right front contact of relay 326, outer left back contact of relay 300, inner right front contact of relay 322, conductor 332, winding of select magnet 401 and battery. With select magnet 401 operated, the operation of hold magnet 4
  • nal units selection takes place in a manner similar tc the selections above described and results in the closure of cross-point 116.
  • 021 are operated as above, opening the fundamental circuit. Since no circuit exists for relay
  • Relay 520 also opens the locking circuit for relay 300 previously controlled by relay 306 permitting relay 300 to release, in turn releasing relay 204.
  • relay 520 closes a circuit from battery over the lower normal contacts of relay 5
  • the cross-bar register is connected to the ,marker and the recorded number transmitted thereto, the register translating the selections back into a numericaldesignation.
  • closed they following conductors are grounded directly by cross-pointsv which are supplied with groundover conductor 423 and the back contact ofrelay 1,62; thousands conductors1l2, 1
  • v v Frame tens conductor 164 is grounded over the upper front contact of relay 30
  • the marker connects ground through the marker connector 800 to conductors 30
  • the cilice identication conductor 2.50 isgrounded over the lower front contact of relay 208 and conductor 802.
  • Reorder conductor 544 is grounded over the upper baclrv contact of relay 534 and conductor 802.
  • ground is connected either directly or indirectly to all of the registering conductors connecting the sender with the marker.
  • all of the register relays in the marker are operated to close a chain circuit (not shown) as a check for faults in theV connections between the sender and marker. If the chain circuit is closed, ground is removed from conductors 80
  • themarlier is vconnected directly with the incoming junctor under the'control of a circuit completed over conductor 2
  • the marker In the selection of the wanted line the marker combines the thousands and hundreds registrations-to operate a relay representing a block of five hundred numbers. Anurnber of such relays are indicated byrelays 8
  • relay 305 is released following the establishment' of the chain circuit and operates relay 806 over itsback contact. With relay 806 operated, the circuit of the 50B-block relay closed by the thousands and hundreds registers represented by relays 301 and 803, respectively, extends over front contactsv of relay 806 to relays 8
  • relay H9 will be operated, in turn operating group relay
  • 23 connects ground to conductor H5 over ⁇ the contact of relay
  • locks to conductor ZIB when relay 236 operatesA
  • the operating circuit of relay 200 which extends as previously traced to the upper back contact of relay 252 now in completed over the upper back contact of relay 2
  • relayl 230 When relayl 230 operates, connecting the ter-A minating sender 'with the .centralized sender, conductor 232 is connected over the inner upper front contact of relay230, inner lower frontl contact of relay 2
  • 002 is in a direction to operate that relay which in turn operates relay
  • 003 locks over its inner upper front contact to grounded conductor 936.
  • 003 reverses the direction of lcurrent flow through the stepping relay
  • relay 003 also connects ground over its outer lower front contact, outer lower front contact of relay 9!9,middle right iront contact of relay 323, brush 904, conductor 930, right back contact of relay B02 to the left winding cf relay B24 and battery.
  • Relay 624 locks in. a circuit from battery through its right -wind-

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Description

Oct. '14, 1941. R. c. DAVIS ETAL 2,259,101
TELEPHONE SYSTEM Filed May 15, 1940 11` sheets-sheet 1 Get. 14, 1941. AR. c. Dvis ErAl.
TELEPHON E S YS TEM 11 sheets-shet 2 Filed May l5, 1940 /Nl/,ENTORS ATTO/MEV R. c. DAvls ET AL 2,259,101
TELEPHONE SYSTEM Oct. 14, 1941.
Filed May 15, 1940 11 sheets-sheet s R. C. DAV/5 /Nl/E/VTORS J. B. NEWSOM W 8. STR/CKLER By @4M A T rom/5V Oct. 14, 1941. R, Q DAV|$ ETAL 2,259,101
TELEPHONE SYS TEM Filed May 15, 1940 l11 sheets-sheet 4 RC. DAV/S /Nl/E'NTORS J.B. NEWSOM 5KB. STR/CKLER Byaeesm A TToRA/Eg Oct. 14, 1941. R. c. DAvls ET AL TELEPHONE SYSTEM Filed May l5, 1940 11 Sheets-Sheet 5 www.
k. c. 0A ws /NVENTORS J. a. fvswsou By nf s Tmc/(LER A from/FV Oct. 14, 1941. R. c. DAVIS ET AL 2,259,101
TELEPHONE SYSTEM v Filed May 15, 1940 l 11 sheets-sheet s Crm-"1.
RC. DAV /Nl/EA/TORS J. B. NEWSOM W B. STR/CK/.ER
ByDM
A T TOR/VE V 0d. 14, 1941. R. c. DAVIS ET Al. 2,259,101
TELEPHONE SYSTEM Filed May 15, 1940 1l Sheets-sheet yr 1 l i I l I l l l I I u l 4 I l l v l FJ m f R. c. 0A ws Qj /NVE/VTORS J. E. NEWSOM t By ma. STR/clam A T TOR/VFY Oct. 14, 1941. R. c. DAvls ET Al.
TELEPHONE SYSTEM ll Sheets-Sheet 9 Filed May 1,5, 1940 R. C. DAV/S /N VE N TORS J. B. NEWSOM By W B. STR/CKLER 606. M
A TTOR/VEV Oct. 14, 1941.
R. c. DAvls ET'AL 2,259,101
TELEPHONE SYSTEM Filed May l5, 1940 11 sheets-sheet 10 l?. DAV/S /NI/ENTORS J. B. NEWSOM n. B. S TR/CKLE'R @y @6. ad
A T TOR/VE V TELEPHONE SYSTEM Filed May l5, 1940 11 Sheets-Sheet l1 MARG/N.
MARS/NHL.
A T mlm/EV case gives the identity of the office.
Patented Oct. 14, 1941 TELEPHONE SYSTEM Richard C. Davis and James B. Newsom, Great Neck, N. Y., and Walter B. Strickler, .East Orange, N. J., assignorsto Bell .Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application May 15, 1940, Serial No. 335,240
11 Claims.
'This invention relates to telephone systems and has for its object to facilitate the handling of calls requiring the services of an operator.
In general, it has been found desirable where only a few operators are needed at individual oiiices to pla-ce these operators at a centralized point where they rnay'serve a number of such oices. Heretofore, vin order to do this it has been necessary to carry the talking circuit through the centralized office thereby introducing sources of trouble.
In accordance with the present invention the talking circuits are freed of these sources of difficulty since instead 1of carrying the talking circuits through the centralized oice, the functions vof the vregistering `equipment or senders have been divided into two parts, one .performed at the switching omce and the other performed at the A:centralized oflice, the two parts of the sender being permanently .connected by a lset of four conductors.
In .accordance with `the .present invention where the incoming trunks or junctors have access to more than one office, means is provided to inform the calling .operator .that the office designation is required. The B operator is also pro- ,vided with means for indicating to the sender to which of the offices the call is directed and the 'sender is provided with means for combining these indications into an .office indication to the marker.
.More specifically., during the connection of the 4incoming junctor andthe terminating sender, a group circuit in the link control circuitsets up an indication `in the terminating sender which shows whether the calling junctor has access to one or more than one oiice and in the former If the junctor serves a plurality of ofces, the terminating sender passes this information to the centralized Isender which, in turn, modifies the operation of the tone generation yat the operators position to inform the originating operator that the oilce identity should be given. The B operator Vreceiving this information gives a discriminating indication to the centralized sender which 4passes this 'information to the terminating sender by to make selections in the proper ofce.
If lthe sender vdoes not receive a complete desvignation it transmitsa special reorder designation to the marker "to cause the transmission of a reorder Vsignal yto the originating operator.
These and other features of the invention will be -more apparent from a lconsideration of the following description in connection 'with lthe drawings in'which:
Fig. 1 shows 'in diagrammatic form 'an originating office, a plurality `of incoming junctors, terminating switches and a plurality of called lines. In addition, 'it shows apart of the sender link;
Figs. 2, 3, 4, 5 vand '-Z Vshow Apar-ts of ,the sender at the .terminating oiiice, Figs. 2 and 5 showing the connection control relays, Fig. 3 showing the pulsing and counting relays, and Figs. 4 and 7 showing a cross-bar type :register:
Fig. 6 shows the-operators position at the vcentralized cnice;
Fig. 8 shows fa `part :of the marker;
Figs. 9, 10 and '11:show the recorder and position :finder circuit located at the centralized .ofce, Fig. 9 showing .the position iinder, Fig. 10 showing the steering relays and the .counting relays, Fg. 11 showing the register relays; and
Fig. 12 shows the manner in which Figs. 1 to 1-1 should be arranged.
For Ia com-plete showing Yof the terminating marker, reference fis lhereby made to Patent No. `2,232,371,--granted to J. W. Dehn et al., Feb. 18, 1941, while vfor a more complete discussion of the trunkng :arrangement .serving a plurality .of .offices `reference is Amade .to the .application .of Hersey et al., Serial No. 335,241, filed May 15, 1940.
Briefly Ythe oper-ation of the present circuit is :as follows: When .a call :originates at a manual junctor.
operators .position 1in the .originating oice |100, the subscriber gives the wanted number 'to the A operator at lthat oiiice. :The A operator then selects an .idle one of .the incoming junctors IUI to |82 .leading vto `the wanted office and inserts the plug .of .her -cord 4in the jack leading .to that The selection of the jnnctor causes lthe sender Vconnector 21H1 :to test for and :connect with the terminating end rof .an idle B sender hereinafter to @be .called the terminating sender. When .the terminating Asender has .been seized it establishes a talking connection through lto the centralized end ofthe sender which will vbe known as the centralized sender. fIlie position nder Ythen hunts for and seizes an idle B .operators position. A tonesignal is then tnansmittedfrom the B position to the A position and the .A operator repeats the :wanted ynumber to the B .op-
erator. The .B operator 'then .sets up the number on her key-set 640 controlling thereby the registers |IIO, H20, H30 and H00 of Fig. 11. When the registration has been completed the B operators position is released and the number is transmitted by means of revertive pulses to the terminating sender where it is recorded on the cross-bar register of Figs. 4 and 7. The number is then transferred to the terminating marker of Fig. 8 which selects the wanted line, sets up and tests a connection between the incoming junctor and the Wanted line and then releases the sender which will, in turn, release the marker.
In the present disclosure it has been assumed that incoming junctors I| and |02 from originating office |00 have access to the incoming and line switches shown at |06 and through them to lines |01 and |00 in office A. Incoming junctors |03 and |04 represent a group of incoming junctors from an originating cnice |50'which lhas access both to the lines of voiice A and to lines of oice B which are not shown. Incoming junctors are arranged in groups and are connected with senders by means of the sender link H0. In the link control circuit each junctor of a group operates a group start relay such as relay H2 or H9 which brings about the connection of the link circuit to the group of junctors by the group relay H3 or |20 and the selection of a group of senders including an idle sender by the sender group relay such as relay H4. When these con- -nections have been established an indication of the ofce at which the junctor terminates is prepared by the grounding of one of the conductors II 5, H 6 or H1. This indication becomes effecl tive when the individual junctor and sender have Abeen connected. According to the cross-connection as shown, the grounding of conductor H1 indicates a junctor terminating in oice A, the
-grounding of conductor H6 indicates a junctor `terminating in oiice B, while the grounding of conductor H indicates a junctor having access to either ofiice A or ofce B.
Call to ojce A Assume that the A operator at the originating 4office in the extension or" a call to a subscriber at oice A has selected the incoming junctor |0I. This junctor operates groupstart relay I I2 which in turn brings about the operation of junctor group relay H3 and sender group relay H4 and the operation of the switches of the link H0. Relay H3 grounds conductor H1 which is extended by the operation of sender grouprelay H4, to conductor H8 leading to the sender.
When the switches of link H0 are ready for `operation the link control circuit connects ground to conductor III operating relay 500 in the selected sender. Relay 500 extends its operating ground over its inner upper front contact, conductor 56|, inner upper back contact of relay 200, conductor to the winding of relay 502 and battery. With relays 500 and 502 operated, a number of registrations are made in the sender. Relay 500 also prepares a number of other circuits over which the link control circuit prepares and tests the connection between the sender and the incoming junctor.
The identity of the oilice which is served by the incoming junctor IIII is recorded by the extension of conductor H8 over the outer upper front contact of relay 500 to the winding of re- I lay 208 and battery.
The identity of the frame on which the in- -coming junctor is located is recorded by grounding one of conductors 506 or 501 and one of the upper ten conductors leading to armatures of relay 502. Assuming that the frame on which the incoming junctor |0I is located is frame I4, conductors 505 and 503 will be grounded. In addition, since the frame is an even-numbered frame, ground will be connected to conductor 5 I 2 leading to the lowest armature of relay 502. The grounding of conductor 506 completes a circuit over the third upper front contact of relay 500, conductor 500, through cable 505 to the winding of relay 30| and battery. Relay 30| extends its operating ground to conductor 302, operating relay 509.
The grounding of conductor 503 completes a circuit over the inner upper front contact of relay 502, conductor 504, through the cable 505 to the winding of select magnet 104, Winding of relay and battery. Relay 190 is marginal and does not operate unless, due to some difficulty, an attempt is made to operate more than one select magnet. Magnet 104 extends its operating ground over conductor 10| to the winding of relay 300 and battery. Relay 300 operates and extends ground from conductor 302, over its outer upper front contact to the normal contacts and Winding of relay 202, resistance 203 and battery. Relay 202 operates, locking directly to conductor `302, and preparing a circuit for relay 204 from battery through resistance 205, winding of relay 200, front contact of relay 202 to conductor 302. However, relay 202 does not operate, being shunted by the operating circuit for relay 202 which extends over the upper back contact of relay 204 to resistance 205.
The grounding of conductor 5I2 completes a circuit over the lowermost front contact of relay 562 to the winding of relay 5|3 and battery. Relay 5|3 reverses the direction of current flow over the contacts of stepping relay 5M. Wear on the contact of relay 5I4 is reduced by having the current ow reversed for approximately half of the calls. This is accomplished by carrying the `stepping circuit over the contacts of relay 5|3 and operating that relay only for calls over junctors appearing on even-numbered frames.
When relays 500 and 502 having been operated,
rthe link control circuit tests the holding circuit between the sender and the link switches by operating the switches over a circuit including conductor 5| I, second lower front contact of relay 500, and conductor 201. If this circuit is complete, the control circuit then grounds conductor 5I0, completing a circuit which tests whether the frame tens registration has been made, extending over the inner lower front contact of relay 500, front contact of relay 509, which was operated by the frame tens relay, lower winding of relay 206 to battery. Relay 206 at its third lower front contact connects ground to conductor 302 to provide a holding circuit for relays 30|, 202, etc. Relay 206 at its inner upper front contact connects ground to conductor 2I8, marking the sender busy to the link control circuit.
In response to this ground the link control circuit tests, to determine if one and only one frame registration has been made and if an office registration has been made, by connecting ground to conductor 2 I0. The grounding of conductor 2I0 completes a circuit over the second lower front contact of relay 206, outer upper front contact of relay 208, outer upper back contact of relays 2H and 2I2, outer upper front contact of relay 202, conductor 102, back contact of relay 190, conductor 303, back contact of frame tens relay 304, conductor 209 through cable 505, `to- `the winding of relay 200 and battery. Relay 200 locks over its .inner lower `front contact and conductor 2| 9 to ground at the third upper front 'contact of relay 206 and provides a locking cir- ,cuit for relay 206 which extends from battery on 'conductor 2|3 over its outermost lower contact'to conductor 201 to provide a holding circuit for the link switches and extends the same ground over its fourth lower iront contact and the rthird lower front contact of relay 500 to conductor 5I8 as a release signal to the link control circuit. The link control circuit responds to ground on conductor 518 by opening the circuit of relay 500 which now releases.
The sender now remains connected with Athe y junctor by means of conductors 2|4 to 2I1 and '5I9 which extend over the link switches to the incoming junctor, the link switches being held as above described by ground on conductor 201 which extends to the hold magnets of the link switches. Relay 206 connects ground to conductor 2I9 to provide locking circuits for relays V200, 208, 2II, 2|2 and A5I3, and both relays 200 and 206 provide other holding grounds as will appear hereinafter.
-Upon grounding conductor 5|1, relay 200 also closes a circuit over the inner upper back contact of relay 224, conductor 524, outer upper back contact of relay 520, conductor 23| to the winding of relay 230 and battery. Relay 230 signals the centralized sender over the four conductors which vconnect the terminating sender with the centralized sender. To do so, it connects polarized relay 225 between the right windings of repeating coil 226 which is, in turn, connected by conductors 221 and 228 through cable 229 to repeating coil 9|0 in the centralized sender. At the same time, relay 230 prepares the fundamental circuit for receiving the designation from the centralized sender by connecting conductor 232 over the inner upper contact of relay 230, inner upper back contact of relay 2-||, conductor 234 to the winding of relay 3|0 and battery, which is connected in parallel with battery through resistance 3| I and with battery through resistance 309 over the left back contact of relay 308. Conductor 233 is connected over th-e middle upper contact of relay 230, outer lower back contact of relay 2|I, conductor 235 to the winding of relay 5|4 and ground, relay 5I4 being shunted by ground at the inner right back contact of relay 306. The function of the centralized sender in response to this signal will be described hereinafter.
One of the circuits closed by relay 200 is a locking circuit for select magnet 104 and relay 300 which extends over the inner upper and lower front contacts of relay 300, conductor 305, back contact of relay 220, conductor 222 to ground at the inner upper front contact of relay 200. A parallel circuit extends over the middle right back contact of relay 306, conductor 3 01, inner upper back contact of relay 520 to conductor 222.
When relay 202 was operated as previously deframe vertical on the register switch over the 4 scribed, it connected the hold magnet 4I0 of the `ate with the current which iiows through the two windings in series or with the hold magnet kconnected to the two windings. However, the hold magnet 4|0 does operate, vas soon as conductor 22| is grounded, closing-the cross-point 11| prepared by select magnet 104, and locks over its inner upper front contact to grounded conductor 302. The extension of this locking ground to the windings of relay 220 shunts the lower winding thereof and operates the relay under the in'- iiuence of its upper winding. The operation of relay 220 opens one branch of the locking circuit of select magnet 104 and relay 300.
When relay 502 released, a circuit was closed from battery through resistance 52|, back contact of relay 502, winding of polarized relay 522 to conductor 5I'9 leading to the junctor circuit. When relay 200 operates, grounded conductor l5|1 is connected over the upper back contact of relay 523, third lower front contact of relay200, through resistance 539, back contact of relay 502 to the winding of relay 522 in shunt of battery through resistance 52|. As a result of this connection, a relay in the junctor operates and locks and the locking ground for the junctor relay, extending back over conductorr5l9, causescurrent to flow through relay 522 in the operating direction. Relay 522 in operating closes a circuit from grounded conductor 5|1, right contact of relay 522 to the winding of relay 523 and battery. Relay 523 operates and locks directly to conductor 5| 1. Ihe operation of relay 206 also connects battery through resistance 223, outer upper ,backV contact of relay 224, outer lower front contact of relay 206, to conductor 2|6, operating a `relay in the junctor which puts the talking circuit into condition for communication between the A and B operators.
The connection of relay 225 across the conductors 221 and 228 closes a circuit in the centralized sender from battery through the lower winding of relay 9I2, outer lower back contact of relay 9| I, lower left winding of repeating coil 9|'9 to conductor 221, through the relay 225 and repeating coil 226, conductor 228, lower right winding of repeating coil 950, inner lower front Contact of relay V9| I, upper winding of relay 9|'2 to ground. Relay 9|2 operates and closes an obvious circuit for relay 9 I3.
The operation of relay 9I3 starts the position nder hunting for an idle operators position by closing a circuit from battery through the winding of relay 9I4, upper back contact of relays 9I5 .and 9|6, conductor 920 to ground at the middle lower front contact of relay 9 I3. Relay 9|4 closes a circuit from battery through the lower winding the winding of relay 963, back contact of steppingrmagnet 301, inner lower back contact of relay 919, outer front contact of relay 914, lower back contact of relay 916, upper outer contact of relay 918, upper normal contacts of relay 915 to grounded conductor 929. Relay 998 operates in this circuit and at its left Contact closes a circuit from battery through the winding of magnet 901 to the operating circuit of relay 906. Magnet 901 operates, opening the circuit of relay 999, which releases in turn releasing magnet 991 to step the brushes of position nder 900. The release of magnet 901 recloses the circuit of relay 998 and the same cycle is repeated until an idle position is found.
When a position such as the position of Fig. 6 is occupied, the insertion of the plugs of the operators headset 605 in the position jack 696 closes a circuit from battery through the right winding of relay 694, through the plug and jack connection and the transmitter of the headset to ground through the left winding of relay 694. Relay 694 operates, connecting battery over its inner left contact, conductor 612, left normal contacts of key 693, left back contact of relay 602, resistance 601 to conductor 699. As soon as brush 996 encounters the terminal to which conductor 699 is attached, relay 916 operates, opening the circuit of relay 906 and magnet 901 and bringing the position finder to rest. It is apparent that, if the position nder is resting on an idle position, relay 916 will immediately operate and the position nder will not advance.
Relay 916 locks in a circuit from battery on conductor 699, brush 996, inner back contact of relay 916, outer upper contact of relay 911, middle winding and upper front contact of relay 916 to grounded conductor 929. Relay 919 releases relay 914 and when relay 914 closes its back contact, a circuit is completed from battery through the winding of relay 919, resistance 921, back contact of relay 914, lower front contact of relay 916, outer Contact of relay 918, normal contacts of relay 915 to grounded conductor 929. Relay 919 operates, closing a circuit from battery through the winding of relay 915, inner lower front contact of relay 919, outer upper back contact of relay 919, upper normal contacts of relay 915 to grounded conductor 920. Relay 915 locks over its upper alternate contacts to conductor 920 and closes a holding circuit for relay 919 under the control of relay 916, In addition, relay 919 closes a circuit from battery through the winding and normal contacts of relay 911, middle lower front contact of relay 919, brush 905, conductor 922, left back contact of relay 691 to the winding of relay 608 and ground. Relay 911 is marginal and does not operate but relay 608 operates. Relay 608 closes a circuit from battery over the inner left front contact of relay 604, conductor 612, contact of relay 698 through lamp 699 to ground through interrupter 610 to warn the operator that her position has been seized. Relay 915 closes a circuit from battery through the winding of relay 923, lower front contact of relay 915, outer upper back contact of relay 1000, outer upper back contact of relay 911 to ground over conductor 929. Relay 923 connects the outer ends of the upper windings of repeating coil 919, over brushes 991 and 992, conductors 921 and 928 to the position circuit. The inner end of the upper right winding of coil 910 extends through the upper windings of polarized relays 924 and 925, inner upper back contact of relay 911 to ground over the outer lower back contact of relay 1090 and through resistance 1001. 'Ihe inner end of the upper left winding of coil 910 extends through the lower windings of relays 924 and 925 to battery over the outer lower front contact of relay 913 through resistance 926.
In the position circuit conductor 921 extends through the windings of relay 611 to conductor 928. Therefore, relay 611 operates and at its right contact extends conductor 928 over the outer right back contact of relay 613 to the secondary winding of tone coil 614. Conductor 921 extends through condenser 615 over the outer left back contact of relay 613 to the other side of the secondary winding of tone coil 614. Relay 611 at its left contact closes a circuit from battery on conductor 612 to the winding of relay 629 and ground. Relay 629 operates and closes a circuit from tone source 616, inner left front contact of relay 629, left back contact of relay 611, right back contact of relay 618, primary winding of tone coil 614 to ground at the inner right back contact of relay 613, thereby transmitting a tone over the conductors 921 and 928, brushes 901 and 902, through repeating coil 910, conductors 221 and 228, through repeating coil 226, contacts of 'relay 266, conductors 214 and 215 and thence to the position of the A operator. The operator of Fig. 6 may also hear the tone through condensers 620 and 621.
Relay 629 also closes an obvious circuit for relay 691 and completes a circuit for relay 619 which may be traced from battery through the winding of relay 619, right back contact of relay 611, conductor 622, outer left contact of relay 629, to ground at the outer right front contact of relay 604. Relay 601 disconnects conductor 922 from the winding of relay 698 permitting relay 608 to release and disconnect battery from lamp 699. With relays 629 and 601 operated, a circuit is closed from battery through the winding of relay 618, right front contact of relay 691,
inner left back contact of relay 613, to grounded conductor 622. Relay 61'8 is slow to operate and, after an interval, opens the circuit through the primary winding of tone coil 614, thereby interrupting the tone. Relay 618 closes a circuit from battery through the left winding of relay 602, left front contact of relay 618 to ground on conductor 622. Relay 692 locks through its right winding and `inner right front contact to ground at the outer right contact of relay 629 and extends its operating ground to the winding of relay 623. In addition, relay 602 reconnects lamp 609 over the outer left front contact of relay 692, left normal contacts of key 693 to battery on conductor 612. Relay 623 operates and recloses the primary circuit of tone coil 614 which now vextends over the right front contact of relay 618 and the outer left front contact of relay 623 instead of over the back contact of relay 618. A second tone is therefore transmitted to the A operator. Relay 623 also closes a circuit from ground on conductor 622, inner contact of relay 623 through the winding of relay 611 and battery. Relay 611 is also slow to operate and after an interval again opens the primary circuit of the tone coil to interrupt the second impulse of tone. In addition, relay 611 closes a circuit from ground on conductor 622, right front contact of relay 611, left back contact of relay 624 to the winding of relay 613 and battery. Relay 613 operates, locks over its left alternate contacts to ground on conductor 622, short- circuits condensers 620 and 621 and connects ground over its right alternate contacts to lamp 609 in shunt aasaior of. interrupter 6I0 whereby lamp 609 glows steadily to 'inform the operator` that she has been con-- nected to the A. operators position.
The A operator then passes the wanted number to the B operatorand the B operator operates4 the. keys of her key-set to record the number given. Assuming that the called. number isV 3674 the B operator will operate keys 633, 636, 631 and 634 in succession.
During the transmission4 of the tone and previous to the operation of the key-set, the sender and the key pulsing circuits are prepared for operation. by the establishment of three registering circuits. The operation of relay 602, as previously described, disconnects battery from conductor 609- thereby releasing relay 9-I6 which in turn releases relay 9I9. With relay 9I9 released, the first registering conductor 922 is disconnected from relay 91.1 and connected over the middle back contact of relay 9I9, outer right front contact oi relay 923,. conductor 929, winding of relay H03, normalcontact of relay .IIOI, right winding of relay I |02, lower normal contacts of relay H35, upper winding oi units register relay H43, lower winding of units registery relay IIj42 to ground. The release of relay 9-I9 also extends the second registering conductor 930 from brush 904, middle right contact of relay 923, outer back contact of relay 9IY9, conductor 932 through the winding of relay H00 and thence to vground as traced from the winding of relay II03. The third registering conductor 93I' extends from brush 903, inner right front contact'of relay 923, conductor 933, through the left winding of relay H02 but the circuit` is incomplete'at this time.
In the position circuit, conductor 922 extends over the left front contact of relay 601, conductor 56|.; through resistances 62'5Y and 626, inner left contact `of relay 621,l conductor 628, left front contact' of relay 6'II to battery onconductor 612, While conductorY 930 extends over the outer right front Contact of relay 602, conductor 652, through resistances 649 and 650, outer left contact of relay 621 to battery over conductor 628 as traced. Conductor 93|Y extends through the winding of relay 64I, leftYback contact of relay 642, right backl contact of relay- 643 to ground over key 644.
Relay H00 and. H03, as Well as relay H02 and the units-register relays, operate the circuits above traced'. Relays H00and H03 close. a circuit from ground atthe inner upper front contactof relay- 9513, conductor 934, front contact ofrelay- I'Illil-iront contactof relay H03, through the lower lwinding of relay I IOI and battery.
Relay HI operates in this circuit, opening the circuit of relay H02 and the register relays which release. It also` closes a holding circuit for itself'from battery in the position circuit, through the windings of relays H00 and H03. as tracedyalternate contacts and upper winding of relay Htl-I, vconductor 935 to ground at the second upperiront contact of relay 903. Relay H-`0I also closes; 'a circuit 'from ground on conductor 934, upper front contact vofr relay IIOI, windings of relays IjlilV and HI5 to battery` Relays IH5 and H-I' operate, relays HI'B closing at its left Contact a 'locking' circuit for the two relays to ground onV conductor 934. At its right contact rel-ay H49 also closes a circuit from grounded conductor-'934 to the windings of relays H26 and i'I25a/nd battery.` Relays H25 and H26 operate, relay'll26 closing a locking circuit for itself and an operating circuit for relays H36 and H35. Relay H36 locks vrelays H35 and H36 to conductor 934' andy operates relay H46` through resistance H41., kRelay H49. lalsolocks to` conductor934..
With relay H35 operated, a circuit isclosed from battery through resistance H48, upper back.A
contact of 'relay H45 through the upper winding of relay IH4, upperalternate contacts of relays HI5, H25 and'jH35,.lef t winding of relay H02.,
to' conductor 933, completing the third registering circuit which was. previously traced. to conductor 9,33v and operatingjrelay 64Iy in the'posi'- tion circuit. Relays 64I and. H02 operate in this. circuit but relay H02 is. ineiective at this time, Relay 64I closes a locking circuit for itself over itsouter left contact to ground on conductor 622 Y and extends this ground over its inner left contact to the winding," of relay 642 and battery on conductor 629.v Relay 642 locks over its let front contact and right back contact of relayV 643 to ground on key 644,"opens the operating circuit for relay. 64Iv and closes a circuit from batteryv through Vthe lwinding. of relay 621,. inner right of relay HOI connects ground fromconductor 934 over the inner upper backcontactoi relay I IOI to conductor I I50,.there by completing a cir-Y cuit oyer the right front contact of relay H46 to the winding of relay H45 and battery. Relay H45 locks to conductor H50, disconnects battery from conductor 933 and extends that conchlctorv to4 ground-at, the .outer upper backl contact of. relay II0I.`
The operation Qf-re'lay H45 releases relay 94| :whieh new extends, conductor 93| through .me
l key 633, batteryis connected from conductor. 62.8
over thelowercontact of key 633 through low resistance ,9.495 to conductor 96,2 and over'the upper Contact oikey 633 throughv low resistance 646 to conductor 663. Conductors 662 and 663 extend. as previously traced to conductors 932 and 933, respectively. Conductor 932Y extends through the winding, of relay H00, normal contacts of relayv Hill, right winding of relay H02, lower. alternate contacts of relays H35, H25 and HI5, upper windingof relay I I I3, lower winding of relay-I I I2 to; ground, while conductor, 933 ex-` tends throughthe left winding of relay I I02, up. per alternate contacts of, relays` H35, I IE5 and I H5, upper winding of relay IH4, outer upper front contact of relay I |45, to ground at the cuter upper back ycontact of relay H0 I.v Relays H00 and H02` operate.` Since onlylow resistance649 was included in thecircut over conductor .932, marginal`relay`HI3 operates in that circuit as well Aas relay H,I.2, and -since only low resistance 646 was. included in the circuit over conductor 933, relayl I I4'operates.. The operation of relay H35 and H25, inner lower front contact of relay III5, winding of relay HII and battery. Relays HH, |II2, |II3 and H|4 lock to conductor H50. Relays HH and H|2 close obvious circuits for relays HI8 and IHS.
The operation of relay H02 closes a circuit from grounded conductor H50, front contact of relay H 02, outer lower front contacts of relays H35 and H25, inner upper front contact and winding of relay III5 to battery. This circuit is in shunt of relay ||I6 and causes that relay to release but holds relay I H5 operated until the key is released at the key-set, when relay III5 also releases transferring the registering circuits to the hundreds register I |20.
The operation of key 636 to record the hundreds digit connects battery through resistance 625 to conductor 66| and battery through resistances 641 and B46 to conductor B03. Conductor 66| extends as previously traced to conductor 929, through the winding of relay H03, normal contacts of relay HOI, right winding of relay H02, lower alternate contacts of relays H35 and H25, lower normal contacts of relay |H5, upper winding of relay H23, lower winding of relay H22 to ground. Since only a low resistance is included in this circuit, relays H22 and I |23 both operate, locking to conductor I |50. Conductor E33 extends as previously traced to the upper alternate contacts of relay H25 and over the upper normal contacts of relay III5 to the lower winding of relay H24 and ground. Since high resistance 641 was included in this circuit, relay H24 does not operate. Relay H02 in operating closes a circuit from ground on conductor H50, front contact of relay H02, outer lower front contacts of relays H35 and H25, inner upper back contact of relay II I5, to the winding of relay H25 and battery. Relay H26 is shunted by this circuit and releases, relay H25 being held operated until the key is released at the key-set when relay H25 also releases, transferring the registering circuits to the tens register H30.
The operation of key 63T for the tens digit connects high resistance battery to both conductors and 663, resulting in the operation of relays H03, H02 and H32 in a manner similar to that described for previous registrations. Register relay H32 locks to grounded conductor H50. Relay H02 now shunts relay H36 and holds relay |I35 which releases when the key is released, to transfer the registration circuits to the units register H40.
The operation of key 634 to record the units digit connects low resistance battery to conductor 663 and high resistance battery to conductor 652 thereby operating relays H00, H02, H44, H42 and H4I. The operation of relay H02 completes a circuit from grounded conductor H50, front contact of relay H02 over the` lower back contact of relay |35, to battery through resistance I |41 thereby releasing relayV H46. With relay H46 released, as soon as relay H02 closes its back contact at the end of the pulse, a circuit is closed from grounded conductor I |50, back contact of relay H02, outer lowerl front contact of relay H45, right back contact of relay Hll, conductor |I|, upper back contact of relay |003 through the winding of relay |000 and battery. Relay |000 locks over its outer upper front contact to grounded conductor 034 andV prepares for the transfer of the designation from the centralized sender to the terminating sender. Relay |000 operated, disconnects ground from the windings of relays 024 and 925 thereby opening the circuit of relay BH which releases, disconnecting battery from conductor 028 and releasing relays 642 and 029. With relay 620 released relays 601 and 602 also release and ground is disconnected from conductor 622 thereby releasing relay 6|3. The release of relay 602 restores the connection of battery through resistance 00| to conductor 600 thereby placing the position circuit in condition to be selected in connection with another call, In addition, relay |000 opens the circuit of relay 923 disconnecting the position nder from the centralized sender circuits.
Relay |000 in operating also disconnects the conductors 232 and 233 from the winding of relay |002 and completes the fundamental circuit for transferring the designation to the terminating sender. This circuit was prepared when relay 9|3 operated by the operation of relays |005 and |005. Relay |005 operates in a circuit from battery through its winding, back contact of relay |0|5, outer upper back contact of relay |020, conductor 036 to ground at the inner lower front contact of relay 9|3. With relay |005 operated, the circuit of relay |006 extends from battery through the winding of that relay, lower front contact of relay |005, inner upper back contact of relay |028 to ground over conductor 036. Relay |000 locks over the inner upper back contact of relay |028 to grounded conductor 936 independent of relay |005. Therefore, when relay |000 operates, a circuit is closed in the centralized sender from conductor 232, lower front contact of relay |000, lower back contact of relay |003, back contact of relay |021, lower back contact of relay |028, outer upper front contact of relay |000, Winding of stepping relay |004, inner upper back contact of relay |003, inner upper front contact of relay |000 to conductor 233.
The closure of the fundamental circuit in the centralized sender causes the operation of relay 3I0 in the terminating sender. Relay 3|0 closes a circuitA from batteryithrough thc winding of relay 308, middle upper front contact of relay 300, which has been held operated following the registration of the frame designation, outer right back contact of relay 306 to ground at the front contact of relay 3|0. Relay 308 locks to the front contact of relay 3|0 independent of relay 300 and closes an obvious circuit for relay 306 which locks to ground over the outer lower front contact of relay 300. 'I'he operation of relay 306 opens the second locking circuit for relay 300 and that relay releases, leaving relay 306 dependent upon relays 308 and 3|0.
With relays 306 and 308 operated, ground is disconnected from conductor 235 permitting the `steppingrelay 5I4 to operate. Relay l5|4 closes a circuit from ground over the outer upper front contact of relay 5|3, front contact of relay 5|4, lower front contact of relay 5I3 to the winding of relay 530 and battery. Relay 530 closes a circuit from ground over its lower contact, normal contacts of jack 53|, conductor 532, left back contact of relay 3|2, winding of relay 3|3 to battery. Relay 3|3 closes a holding circuit from battery through its winding, right winding of relay 3|2, back contact of relay 3|4, left contact of relay 3I3 to ground at the outer right front contact of relay 308, but relay 3|2 does not operate, being shunted by the operating circuit of relay 3|3.
Relay 530 at its upper front contact connects ground to conductor 234 thereby holding relay At the terminating sender the operation of relays 308 and 300 connects ground to the right armatures of relay 3|2. When relay 530 releases after the rst revertive pulse, relay 3`|2 operates in the holding circuit of relay 3|-3 and closes a circuit from ground at the inner left front contact of'relay 308, right front contact of relay 312,l left back contact of relays 324 and 322, right back contacts of relays 323 and 325 to the winding of relay 32| and battery. Relay 32| operates and locks over its inner right front contact, normal contacts of relays 322, 323, 324 and 325, outer right front Contact of relay 305 to ground over conductor 301. A parallel locking circuit extends from the contact of relay 325 over the up'-v per normal contacts of relay 300 to groundedy conductor 22|. The next operation of relay 530', grounding conductor 532 closes a circuit over the left front contact and left winding of relay 3|2 through the right winding of relay 3M and loat- I tery. Relay 3|4 opens the operating circuit of relay 3|3 and that relay releases. When relay 530 releases, relays 3M and 3|2 also release. A circuit is then closed from ground over the right back contact of relay 3|2, inner left front Contact of relay 32| to the winding of relay 322 andbattery. Relay 322 locks over the chain circuit previously traced, opening the locking circuit for relay 32| which releases. Subsequent operations of relay 530 cause relays 3|3, 3M and 312 to operate as above described so that for each odd pulse ground is closed to the counting relays'over the front contact of relay 3|2 and. for each even pulse ground is connected to the countingV relays over the backrcontact of relay 3|2. The third, fourth, fifth and sixth' pulses operate relays V323, 324, 325 and 323, respectively. Relay 325 locks over the back contact of relay 32|, therefore remaining operated when relay 32S is operated. Relay 326 locks through its right winding and inner right front contact over the outer right front contact of relay 300 to conductor 301 independent of the other counting relays and therefore re-f maining operated during any subsequent pulses. The seventh, eighth, ninth and tenth pulses operate relays 32 322,l 323 and 320, respectively, relay 32| releasing relay 325.
The regular terminating sender is arranged to receive the wanted number from the originating sender in the forro of three selections known as incoming brush, incoming group and nal brush selections, which are translated from the thousands and hundreds digits of the Wanted number, followed by nal tens and final units selections corresponding directly to the tens and units digits of the wanted number. Therefore, in order to provide for theY simple modification of terminating sendersv to work with a centralizedY B operators equipment or vice versa, the terminating end of the present sender is likewise equipped with a cross-bar register having ve verticals for receiving five selections and translating them into a numerical de's'igriationv for transmission to the marker.
In the centralized end 'of the sender theV five selections vare controlled by the steering relays |030 to |039. When relay 553' operated grounding conductor 834, a circuit was closed over the middle upper back contact of relay|000 through the windings of relays |030l and |03 in seriesI to battery, relay |030 closing a locking circuit through the windings of; relays w30-and |03|-, front contact of relay |030, upper back contact of relay |033' to grounded. conductor 034, independent of relay |000.
Withv relays |030 and |03| operated, vthe operation of relay |004, by the establishment of the fundamental circuit, closes a circuit from ground over thev upper back contactof relay |001, front contact ofrrela-y |004, lower back contact of relay |001, back contacts of relays |020v and |02|, inner upper front contact of relay |03|, conductor |000,` middle' upper front contact of relay |||4, outer upper front contact of relay |||3, lower front contacts of relays |9 and |||B, conductor H52, upper front contact of relay |005, winding of relay |0|l to' battery. Relay |0|| locks through thewnding of relay |02| to' ground at the lowermost contact of rel-ay |006, but relay |02 does not operate, being shunted by the opera ating circuit for relay |0| t. When relay 530 operates, shuntingthe stepping relays of the two senders, relay |0013 releases, permitting relay |024. to operate. When relay 530' releases permitting relay |004 to reoperate, the counting relay circuit extends, as above tra-ced, tothe upper armature of relay |02| and` thence over thefront contact of relay |02 upper back contacts of relays |030, |035 and |032 to the winding of relay |0'|0 and battery. RelayV |0|0 operates, lock-ing through the windings of rel-aysl02-1 and |020 in parallelto ground at the outer lower front con'- tact of relay |000. When relay |000 is-shunted andA releases for thesecond time, relays |021 and |020 operatev in this locking ci-rcuit.- The operation of relay |021 opens the fundamental circuit, releasingrrelays 3|0, 5M and |004, and bringing the lselection to an end.
Relay |020 closes a circuit from ground atl its contact over the lowerlcack contacts of lrelays |030, |031, |035 and |033, lower front contactfof relay |03| to the ywinding ol relay |032 and battery; a Relay |032v closes ai locking circuit for i-tself through the winding of relay |033-, outer lower front contact of relay|032,rupper back contact of relay |035 to grounded conductor 9734-. RelayY |032 also closes acircuit from grounded conductor 934, outer upper front contacter" relay |03|, inner lower contact of relay |032 to the winding. of relay |028 and battery. Relay |028 further opens the fundamental circuit and disconnects grounded conductor 030 from the oping that relay torelease and open the fundamental.A circuit at an additional point.A YRelay |028 alsoopens theoperating circuit of relay |005 and that relay releases. The release of relay |000 opens the locking circuit of lthe counting relays and these relays release. The release of relay |020' permits relay |033 to operate in the locking circuit of relay |032 and openthe locking circuit of relays |030 and |03| so that these relays release. The releaseY of relay |03| opens the cir- Vcuit of relay |020 and that relay releases, restering the circuits of relays |005 andV |000'which now reoperate. Withl relay |006 reop'erated-` the fundamental circuit is reclosed and the Centralized4 sender is' ready to transmit the next selection..
At the terminating sender the two revertive pulses which satisfy the centralized sender cause the ope-ration of relays 32| and 322 leaving relay 322 operated` and locked when the fundamental circuit was opened. The release of relay 3|0 in turn releases relays 308 and 303. With relay 306 released, a circuit is closed from ground at the lower back contact of relay 534, conductor 535, lower normal contacts of relay 300, right back contact of relay 320, first left back contact of relay 306, outer left front contact of relay 322, conductor 33|, winding of select magnet 10|, winding of relay 130 and battery. Magnet 10| prepares the crosspoints at the No. l level of the register switch and extends its operating ground to the winding of relay A300 as previously described. Relay 300 locks over the back contacts of relays 220 aind 306 as before, thereby also locking the select magnet 10|. At its outer upper front contact relay 300 connects ground on conductor 302 over the upper front contact of relay 204 to resistance 203 and battery in shunt of the winding of relay 202 which thereupon releases. Relay 204 is held operated over the normal contact of relay 202 after that relay releases. With relay 202 released and relay 204 operated, the windings of relay 220 are connected over the lower front contact of relay 204, lower back contact of relay 202, conductor 230, outer upper contact of hold magnet 4|0, upper back contact of hold magnet 4|2, to the winding of magnet 4|| and battery. Magnet 4|| closes cross-point 112 and locks over its inner upper front contact, conductor 42|, through cable 422 to ground at the fourth upper front contact of relay 206. The closure of this locking circuit extends ground back to the upper winding of relay 220 causing that relay to operate opening one locking circuit for relay 300.
When the fundamental circuit is reclosed at the centralized oice, relays 3|0, 308 and 306 reoperate and relay 300 releases, in turn releasing relay 204. The remaining selections are performed in essentially the same manner, relay 300 operating relays 202 and 204 on alternate selections and releasing them on the following selections.
Since the thousands and hundreds digits have been translated into incoming brush, incoming group and final brush selections, with relays |032 and |033 operated to control incoming group selection, the counting relay circuit extends as previously traced to the armature of relay |02|, over the back contact of that relay, inner upper front contact of relay |033, conductor |040, inner upper front contact of relay |||3, inner upper front contact of relay i I4, lower back contact of relay H24, back contact of relay |023, winding of relay |0|3 and battery. For this selection, when relays |0|| and |02| are operated, after three revertive pulses the counting relay circuit extends over the front contact of relay |02|, upper back contacts of relay |038 and |036, upper front Contact of relay |032, lower back Contact of relay 940, winding of relay |0|0 to battery. At the end of the selection, the fundamental circuit is broken as above, resulting in the operation of steering relays |035 and |034 and the release of relays |032 and |033. In the terminating sender the four revertive pulses leave relay 324 operated, resulting in the operation of select magnet 103 and hold magnet 4|2, closing crosspoint 113.
With relays |034 and |035 operated, the selection is controlled by the hundreds register alone and the counting relay circuit may be traced over the back contact of relay |02| over the inner upper front contact of relay |035, upper front cont-act of relay |23, outer upper front Contact of relay H22, upper back contact of relay ||2|, conductor H52, upper front contact of relay |005, winding of relay |0|| and battery. Two pulses satisfy the centralized sender resulting in the closure of cross-point 114 at the terminating sender.
The nal tens selection takes place with relays |036 and |031 operated. In this case, the counting relay circuit extends as traced to the back contact of relay |02|, inner upper front contact of relay |031, back contact of relay H33, lower front contact of relay |32, lower back contact of relay ||3|, back contact of relay |022 to the winding of relay |0|2 and battery. The first two pulses permit relays |022 and |02| to operate, whereupon the counting relay circuit is transferred over the front contact of relay |02|, upper back contact of relay |038, outer upper front contact of relay |036, upper back contact of relay ||34 to the winding of relay |0|6 and battery. The third pulse permits relay |020 to operate, which transfers the counting relay circuit to the Winding of relay |0|5 which operates when the stepping relay reoperates. Relay |0|5 in operating releases relay |005. As a result of the fourth, fifth, sixth land seventh pulses, relays |025, |024, |023 and |022 operate. With relay |022 operated, the counting relay circuit is extended over the front contact of relay |022, back contact of relay |005 to the winding of relay |0|0 so that eight pulses satisfy the sender. As outlined previously, eight revertive pulses operate relays 32| to 326, leaving relay 326 operated, followed by relays 32| and 322, relay 322 remaining operated at the end of the eighth pulse. Therefore, when relay 306 releases following the opening of the fundamental circuit, the select magnet circuit extends from grounded conductor 535, lower normal contacts of relay 300, outer right front contact of relay 326, outer left back contact of relay 300, inner right front contact of relay 322, conductor 332, winding of select magnet 401 and battery. With select magnet 401 operated, the operation of hold magnet 4|4 closes cross-point 415.
The nal units selection takes place in a manner similar tc the selections above described and results in the closure of cross-point 116. After final units selection has been transmitted relays |0|0, |020 and |021 are operated as above, opening the fundamental circuit. Since no circuit exists for relay |028, there is no means for reclosing the fundamental circuit and it remains open until the centralized sender is released.
In the terminating sender when hold magnet 4|5 operates after the registration of the final units selection, ground is connected to conductor 235 in shunt 0f the winding of stepping relay 5|4 Ato prevent any false pulses by that relay. Magnet 4|5 also closes a circuit from ground over its inner lower front contact, conductor 424, winding of relay 520 and battery. Relay 520 opens the circuit of relay 230 which opens the fourconductors leading to the centralized sender. Opening the connections between conductors 221 and 228 releases relay 9|2 which in turn releases relay 9| 3 removing the locking grounds from the various circuits and restoring the centralized sender to normal.
Relay 520 also opens the locking circuit for relay 300 previously controlled by relay 306 permitting relay 300 to release, in turn releasing relay 204. In addition, relay 520 closes a circuit from battery over the lower normal contacts of relay 5|6, upper normal contacts of relay 5|5, outer lower front contact of relay 523, front contact of relay 520, outer upper front contact of relay 200, to conductor 24| which extends through cable 536 to the marker connector 800 indicated at the left of Fig. 8. When the connector is operated the cross-bar register is connected to the ,marker and the recorded number transmitted thereto, the register translating the selections back into a numericaldesignation. u
.With cross-points 112, 113, 114, 415, 116 and 11| closed, they following conductors are grounded directly by cross-pointsv which are supplied with groundover conductor 423 and the back contact ofrelay 1,62; thousands conductors1l2, 1| I; hundreds conductors 12|,v 122; tens conductors 132 and 134; units conductor 143 and frame conductor 153. v v Frame tens conductor 164 is grounded over the upper front contact of relay 30|.
The marker connects ground through the marker connector 800 to conductors 30|, 802, 803 and V801i. It will be observed that ground over one of these conductors is connected by the crosspointsV to each of the conductors which donot receive ground over conductor 423. For example, thousands conductors 1|| and 1|2 are grounded by cross-points 113 and 112, respectively. The remaining thousands conductors 1|3 and 1|4 are grounded by cross-point 112 from ground supplied Iover conductor 803. The cilice identication conductor 2.50 isgrounded over the lower front contact of relay 208 and conductor 802. Reorder conductor 544 is grounded over the upper baclrv contact of relay 534 and conductor 802.
Therefore ground is connected either directly or indirectly to all of the registering conductors connecting the sender with the marker. As a result, all of the register relays in the marker are operated to close a chain circuit (not shown) as a check for faults in theV connections between the sender and marker. If the chain circuit is closed, ground is removed from conductors 80| to` 034' and the registration remaining in the marker is used to select, test and establish a connection with the wanted line. During these operations themarlier is vconnected directly with the incoming junctor under the'control of a circuit completed over conductor 2 |1. d
In the selection of the wanted line the marker combines the thousands and hundreds registrations-to operate a relay representing a block of five hundred numbers. Anurnber of such relays are indicated byrelays 8|0 to 8|3. Where the incoming junctor serves more than one oiice these numbers may occur in either ofce and the marker rnust discriminate between the oiices. With conductor 250 grounded over conductor 802,
relay 305 is released following the establishment' of the chain circuit and operates relay 806 over itsback contact. With relay 806 operated, the circuit of the 50B-block relay closed by the thousands and hundreds registers represented by relays 301 and 803, respectively, extends over front contactsv of relay 806 to relays 8|0 and 0H which arerindividual to the A office.
W'hen the marker has completed its function, it connects ground to conductor 531 closing a circuit over the lower back contact of relay 538 to the winding of release relay |6 and battery. Relay 5|6 disconnects battery from the marker connector 800 thereby releasing both the connector and the marker. In addition, relay 5|6 locks over its Icuter upper and lower front contacts to grounded conductor 5 l1 under the control of relay 200 and connects ground to conductor 2|8 to hold the sender busyy until released. The operation of relay 5|6 disconnects ground from conductor 2|3 and the locking circuit 'of relay 206 but that-relay, aswell as the hold magnets of the link switches, remains operated untilV ground is removed from conductor 2|3 by the marker connector. When this occurs relay 20S and the link switches release, followed by relay 200.l WithirelaysZ and 200 released the holding circuits for the various relays of the sender are opened andthe sender is restored to normal.
CaliA over a innetor terminating at oice B in the'operation of relay 800 and the extensionv of the operating. circuit orthe 500-block'relays to relays 8|2 and ljindividual to the B office.
Call over a y'unctor terminating at both office A Assuming that the. connection has beenextended over incoming junctor v|34 belonging to the group of junctors which have access to more than one office, relay H9 will be operated, in turn operating group relay |20 If the same group of senders is seized, sender grouprelay H4 will also be operated. .The operation of relay |23 connects ground to conductor H5 over` the contact of relay ||4 to conductor 12|. When the sender is seized and relay 500 operated, this ground isextended over the fourth lower front contact of relay 500 to conductor 540, 4winding of relay 2i! and*` battery. .Relay 2|| locks to conductor ZIB when relay 236 operatesA The operating circuit of relay 200 which extends as previously traced to the upper back contact of relay 252 now in completed over the upper back contact of relay 2|2,. outer upper front contact of relayp2il, upper back contact of relay 208, second lower front contact ofrelay236 to conductor 2|0. y
When relayl 230 operates, connecting the ter-A minating sender 'with the .centralized sender, conductor 232 is connected over the inner upper front contact of relay230, inner lower frontl contact of relay 2| y|, conductor 235 to the winding of relay 5| 4 and ground, while conductorl 233 is connected yover the middle upper front contact of relayA 230, middle upper front contact of relay 2| |,'conductcr 234to Ithe winding of relay 3|0 and battery.V Battery and ground are, there-f fore, reversed on the fundamental circuit connecting the two senders. In Vthe centralized sender the current liowing through the winding of polarized relay |002 is in a direction to operate that relay which in turn operates relay |003. Relay |003 locks over its inner upper front contact to grounded conductor 936., Relay |003 reverses the direction of lcurrent flow through the stepping relay |004 to compensate for the reversal at the terminating sender. During the interval between the operation of relay 923 and the release of relay S50, relay 003 also connects ground over its outer lower front contact, outer lower front contact of relay 9!9,middle right iront contact of relay 323, brush 904, conductor 930, right back contact of relay B02 to the left winding cf relay B24 and battery. Relay 624 locks in. a circuit from battery through its right -wind-
US335240A 1940-05-15 1940-05-15 Telephone system Expired - Lifetime US2259101A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE483523D BE483523A (en) 1940-05-15
FR961957D FR961957A (en) 1940-05-15
NL70952D NL70952C (en) 1940-05-15
US335245A US2259100A (en) 1940-05-15 1940-05-15 Operator's position circuit
US335240A US2259101A (en) 1940-05-15 1940-05-15 Telephone system
US335241A US2261370A (en) 1940-05-15 1940-05-15 Telephone system
GB509048A GB656562A (en) 1940-05-15 1948-02-20 Improvements in or relating to telephone systems

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US335245A US2259100A (en) 1940-05-15 1940-05-15 Operator's position circuit
US335240A US2259101A (en) 1940-05-15 1940-05-15 Telephone system
US335241A US2261370A (en) 1940-05-15 1940-05-15 Telephone system

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US2259101A true US2259101A (en) 1941-10-14

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US335241A Expired - Lifetime US2261370A (en) 1940-05-15 1940-05-15 Telephone system
US335240A Expired - Lifetime US2259101A (en) 1940-05-15 1940-05-15 Telephone system

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US335241A Expired - Lifetime US2261370A (en) 1940-05-15 1940-05-15 Telephone system

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FR (1) FR961957A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499542A (en) * 1944-05-17 1950-03-07 Ericsson Telefon Ab L M System for obtaining successive operation of the selecting magnets in crossbar switches
US2552719A (en) * 1944-11-17 1951-05-15 Ericsson Telefon Ab L M Automatic registering device for impulse series

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618708A (en) * 1942-08-06 1952-11-18 Automatic Elect Lab Telephone system with main and secondary register
US2468299A (en) * 1945-07-07 1949-04-26 Bell Telephone Labor Inc Supervisory signaling in telephone or like switching systems
BE470519A (en) * 1946-01-26
US2573569A (en) * 1948-10-29 1951-10-30 Bell Telephone Labor Inc Frame and trunk selection
NL161592B (en) * 1950-05-31 Xerox Corp PROCEDURE FOR PREPARING A CYAN BLUE ELECTROPHOTOGRAPHIC TONER.
US2747021A (en) * 1950-09-21 1956-05-22 Gen Electric Co Ltd Telecommunication systems embodying automatic exchanges
BE548044A (en) * 1955-05-23
US2981803A (en) * 1955-12-28 1961-04-25 Bell Telephone Labor Inc Program switching system
NL263157A (en) * 1960-04-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499542A (en) * 1944-05-17 1950-03-07 Ericsson Telefon Ab L M System for obtaining successive operation of the selecting magnets in crossbar switches
US2552719A (en) * 1944-11-17 1951-05-15 Ericsson Telefon Ab L M Automatic registering device for impulse series

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BE483523A (en)
US2261370A (en) 1941-11-04
FR961957A (en) 1950-05-26

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