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
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English (en)
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
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Bell Telephone Laboratories Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE483523D priority Critical patent/BE483523A/xx
Priority to FR961957D priority patent/FR961957A/fr
Priority to NL70952D priority patent/NL70952C/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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Relay Circuits (AREA)
US335240A 1940-05-15 1940-05-15 Telephone system Expired - Lifetime US2259101A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL70952D NL70952C (enrdf_load_stackoverflow) 1940-05-15
BE483523D BE483523A (enrdf_load_stackoverflow) 1940-05-15
FR961957D FR961957A (enrdf_load_stackoverflow) 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

Publications (1)

Publication Number Publication Date
US2259101A true US2259101A (en) 1941-10-14

Family

ID=27407045

Family Applications (2)

Application Number Title Priority Date Filing Date
US335240A Expired - Lifetime US2259101A (en) 1940-05-15 1940-05-15 Telephone system
US335241A Expired - Lifetime US2261370A (en) 1940-05-15 1940-05-15 Telephone system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US335241A Expired - Lifetime US2261370A (en) 1940-05-15 1940-05-15 Telephone system

Country Status (3)

Country Link
US (2) US2259101A (enrdf_load_stackoverflow)
BE (1) BE483523A (enrdf_load_stackoverflow)
FR (1) FR961957A (enrdf_load_stackoverflow)

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 (enrdf_load_stackoverflow) * 1946-01-26
US2573569A (en) * 1948-10-29 1951-10-30 Bell Telephone Labor Inc Frame and trunk selection
NL161592B (nl) * 1950-05-31 Xerox Corp Werkwijze voor het bereiden van een cyaanblauwe elektrofotografische toner.
US2747021A (en) * 1950-09-21 1956-05-22 Gen Electric Co Ltd Telecommunication systems embodying automatic exchanges
BE548044A (enrdf_load_stackoverflow) * 1955-05-23
US2981803A (en) * 1955-12-28 1961-04-25 Bell Telephone Labor Inc Program switching system
NL263157A (enrdf_load_stackoverflow) * 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

Also Published As

Publication number Publication date
US2261370A (en) 1941-11-04
BE483523A (enrdf_load_stackoverflow)
FR961957A (enrdf_load_stackoverflow) 1950-05-26

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