US2151772A - Telegraph line circuit - Google Patents

Telegraph line circuit Download PDF

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Publication number
US2151772A
US2151772A US105582A US10558236A US2151772A US 2151772 A US2151772 A US 2151772A US 105582 A US105582 A US 105582A US 10558236 A US10558236 A US 10558236A US 2151772 A US2151772 A US 2151772A
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US
United States
Prior art keywords
relay
line
repeater
circuit
station
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
US105582A
Other languages
English (en)
Inventor
Fullerton S Kinkead
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
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
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US105582A priority Critical patent/US2151772A/en
Priority to BE424061D priority patent/BE424061A/xx
Priority to FR827821D priority patent/FR827821A/fr
Priority to GB27959/37A priority patent/GB487476A/en
Priority to DE1937I0059296 priority patent/DE693292C/de
Application granted granted Critical
Publication of US2151772A publication Critical patent/US2151772A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/04—Switchboards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0108—Winches, capstans or pivots with devices for paying out or automatically tightening the cable

Definitions

  • This invention relates to improvements in long toll subscribers lines for connection to teletypewriter exchanges and switching points.
  • the subscribers station also includes a switch for turning on the power and closing the line, the usual teletypewriter sending contacts and receiving equipment of a teletypewriter,.a sending relay [5, and a break key. Further details'of such subscribers circuits are disclosed in various pending United States patent applications but are not necessary here for a complete understanding of the invention.
  • the cord circuit for cooperating with the jack is may be of the type disclosed in, the application of Locke and Kinkead, Serial No. 459,684, filed ;June 7, 1930, or patent to Kinkead et al. No.
  • the subscribers line i3 terminates at repeater R, but in the idle condition it terminates in relays "D and E of supervisory equipment over back contacts of relays C and J.
  • Relay B has one winding in the loop I! between the switchboard and the repeater R and the other is in a local biasing circuit and repeats all signals to the relay F which is energized on a marking signal torelay B.
  • Relay F is ofthe slow release type; it holds operated on all teletype'writer signals but releases on break signals or openconditions of the subscribers line.
  • Relay 0 connects the line to the line side oi repeater R when energized, holds relay J operated and connects battery to the answering lamps AL.
  • reelased relay C connects the line l3 to contacts of relay J.
  • Relay J when operated, holds relay D oper ated and when released connects the line l3 to windings of relays D and E. Relay J is slow release and during the release time it discharges the line through resistance I660.
  • Relay D tests the line upon release of relay J to determine the station condition and remains 1 operated when relay J releases if the current from the subscribers station is positive (marking) or negative (spacing) but releases when the sub scribers station is idle. :Upon operating relay D will close the lead to relay TL to light call lamp CL and to operate the night alarm (not shown) and upon release prepares a ground path for operating relay A.
  • Relay E is not operated to close its contact when relay J is operated but is operated when marking potential is applied to the line.- at the Operation of relay E operates relay F.
  • Relay F operates relay 0; when relay F is operated it is held by relay 0; relay F is slow release.
  • Relay H operates upon ringing current supplied from the cord over the tip of the jack and applies ringing current to line [3.
  • Relay G- is a sleeve relay and is operated from battery in the cord circuit over the sleeve of jack IE; it opens the circuit to lamp AL and extends the communication circuit to jack it from winding of relay B.
  • V operates relay TL over back contact of relay G
  • relay TL lights lamp CL.
  • Relay E operates relay F, which operates relay C.
  • Relay 0 connects negative battery to the windings of relays D and E.
  • Polar relay E releases, relay D remains operated.
  • Relay C connects line l3 to the line side of repeater R. Repeater R supplies a path for current over lead I! to the operating winding of relay B from the positive battery on lead l8.
  • Relay B closes its contact to hold relay F operated.
  • Relay C also connects battery to lamps AL and the winding of relay J.
  • Relay J transfers the windings of relays D and E from negative battery over contacts of relay C to apath through the back contact of the inner lower armature of relay A, also connected to negative battery.
  • Relay G operates over the sleeve lead and disconnects lamp AL. Relay G also prepares the operating path of relay A and connects the communication path to the tip of the jack and cord. The ofiice side of repeater R is now connected to the tip of jack I5 and the line side to the line 13 over contacts of relays C and J. Relay B follows all teletypewriters spacing signals but relay F holds operated.
  • the subscribers station may now communicate with an operator on the cord circuit (not shown) or thereover to another line.
  • Break signal from subscriber station A break signal holds relay B off its contact until relay F releases, which causes relay C to release. This opens the line 13 to the repeater which continues the spacing condition. After release of relay C and before release of relay J the line is connected to resistance [6a and discharged. When relay J releases resistance
  • Break signal from cord circuit Upon a break signal from the cord circuit or beyond the relay B opens its contact; this releases relay E, which releases relays C and J.
  • Relay J connects the operating path for relays D and E to the line [3 but inasmuch as marking or positive polarity is applied to the line by the subscriber during the break period, the relay E is operated, which in turn reoperates relays F, C and J.
  • relay J Upon reoperation relay J causes relay E to release by virtue of negative battery supplied locally from the source on the back contact of the lower armature of relay C and front contact of relay J.
  • this cyclic operation and reoperation may continue as the relay F again releases upon release of relay E until the break condition is terminated to reoperate relay B, which reoperates relays F, C and J. Communication may then continue.
  • Disconnect signal from station to operator Consider now a disconnect signal from the sub-'- scriber station.
  • the attendant at the station opens the line which releases relays B, F and C.
  • relay C Upon release of relay C and during the holding time of relay J, the charge on the line will pass to ground.
  • relay D Upon release of relay J, relay D will release and cause relay A to operate.
  • Relay A upon operating, opens the communication path, opens the path from battery to the upper armature of relay J, and connects ground to the tip of the cord to operate a supervisory lamp in the cord.
  • the action of relay J in discharging the line is essential to prevent momentary operation of relay D which would interrupt the ground connection to the tip of the cord and interrupt the lighting of the supervisory lamp.
  • the momentary operation of relay E is also prevented so that relay F will not be reoperated.
  • relay B If the subscriber station disconnects during the time a break signal is being transmitted from the cord circuit, relay B will already have been released and the release of relay E will cause the operation of relay A and ground the tip lead when during the releasing and operating sequence of the relays E, F, C and J as previously described the D and E relays are next connected to the line.
  • a recall signal is given by the station operator by operating a recall key which opens the line to direct current for an interval and then recloses it.
  • Upon opening the line relay D will release as described under the heading above to operate the relay A and ground the tip of the cord.
  • the relay D Upon reclosing the line the relay D reoperates and releases relay A which removes ground from the tip and causes the signal in the cord circuit to be a recall or flashing signal (in a manner well known in the art and described in the disclosures hereinabove mentioned).
  • a recall signal may be given to the switchboard operator during a break signal from the switchboard.
  • relay H applies alternating ringing current to the line i3 over a make contact of relay H and a back contact of relay C. After each release of relay H the resistance l6a will discharge the line to prevent any false operation of relays D or E.
  • relay F operates, relay C operates and relay J operates; relay D operates and releases relay A which connects the operating winding of relay B to the tip of the cord for communication in the same manner as when the station called and the operator answered.
  • the operating essentials of the subscriber station are first, that the two lines l3 and I3A in the normal idle condition are connected together at the subscriber station and connected through an alternating current ringer and condenser to ground and that operation of the subscribers recall key connects the two lines together and isolates them from the transmission circuit at the subscriber station.
  • relays D and E must be made a bit sluggish or alternatively the contacts of relay J must be adjusted to operate in proper sequence, or both.
  • a subscribers telegraph toll line terminating circuit a telegraph line therein normally terminating at a central oflice in relays, and relays operated as a result of closing said line to shift the termination to a telegraph repeater connected to means at said central office conditioned for flexibly extending said circuit.
  • a system for telegraphing and supervising exchange connections over a subscribers telegraph trunk line circuit said circuit comprising a local station, an incoming line and a repeater, a contact in said line between said station and repeater, a relay controlling said contact, and a slow release relay controlling said relay.
  • an incoming line said line including a repeater for repeating signals arriving thereover to a local connecting circuit, said line being normally disassociated from said repeater and extending independently of said repeater through relay contacts to elements controlling line operation signals.
  • an incoming line said line including a repeater for repeating signals arriving thereover to a local connecting circuit, said line being normally disassociated from said repeater and extending through relay contacts to elements, said elements controlling line operation signals including a polar device and a nonpolar device.
  • an incoming line said line including a repeater for repeating signals arriving thereover to a local connecting circuit
  • said line being normally disassociated from said repeater and extending through relay contacts to elements controlling line operation signals, and connections whereby said relay contacts are under'the control of a relay which is .actuable by said polar device to close said line to said repeater.
  • an incoming line said line including a repeater for repeating signals arriving thereover to a local connecting circuit, said line being normally disassociated from said repeater and extending through relay contacts to elements controlling line operation signals, and a polar device controlling said relay contacts to close said line through to said repeater, and devices for locking up said relay contacts under the control of said repeater.
  • an incoming line said line including a repeater for repeating signals arriving thereover to a local connecting circuit, said line being normally disassociated from said repeater and extending through relay contacts to elements controlling line operation signals, a
  • relay for transferring said line from said elements to said repeater, a relay locked up to maintain said transfer, means for releasing said locked up relay to restore said line to said elements, and means to connect said line to ground for an instant prior to said restoration.
  • a subscribers telegraph facility for connecting a subscribers premises with a central telegraph switching oil'ice in a manual telegraph switching system, said facility requiring a telegraph repeater for telegraph communication, the method for extending the distance range over which the subscriber has positive control over line operation signals, between said subscriber and the central station operator, which consists in disassociating said repeater from the telegraph path while said signals are being transmitted.
  • a subscribers station a central switching station, a telegraph path, normally open at said subscribers station, connecting said stations, a telegraph repeater, individual to said path, and means in said path for switching said repeater into said path.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US105582A 1936-10-14 1936-10-14 Telegraph line circuit Expired - Lifetime US2151772A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US105582A US2151772A (en) 1936-10-14 1936-10-14 Telegraph line circuit
BE424061D BE424061A (en)) 1936-10-14 1937-10-12
FR827821D FR827821A (fr) 1936-10-14 1937-10-13 Circuits de lignes télégraphiques
GB27959/37A GB487476A (en) 1936-10-14 1937-10-14 Telegraph line circuits for teleprinter exchange systems
DE1937I0059296 DE693292C (de) 1936-10-14 1937-10-15 Schaltungsanordnung fuer Telegraphenvermittlungsanlagen mit einer Mehrzahl getrennter Teilnehmerleitungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US105582A US2151772A (en) 1936-10-14 1936-10-14 Telegraph line circuit

Publications (1)

Publication Number Publication Date
US2151772A true US2151772A (en) 1939-03-28

Family

ID=22306642

Family Applications (1)

Application Number Title Priority Date Filing Date
US105582A Expired - Lifetime US2151772A (en) 1936-10-14 1936-10-14 Telegraph line circuit

Country Status (5)

Country Link
US (1) US2151772A (en))
BE (1) BE424061A (en))
DE (1) DE693292C (en))
FR (1) FR827821A (en))
GB (1) GB487476A (en))

Also Published As

Publication number Publication date
DE693292C (de) 1940-07-05
GB487476A (en) 1938-06-21
FR827821A (fr) 1938-05-04
BE424061A (en)) 1937-11-30

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