GB704039A - Improvements in automatic telephone systems - Google Patents

Improvements in automatic telephone systems

Info

Publication number
GB704039A
GB704039A GB2586951A GB2586951A GB704039A GB 704039 A GB704039 A GB 704039A GB 2586951 A GB2586951 A GB 2586951A GB 2586951 A GB2586951 A GB 2586951A GB 704039 A GB704039 A GB 704039A
Authority
GB
United Kingdom
Prior art keywords
relay
switch
wire
signal
operator
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
Application number
GB2586951A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2586951A priority Critical patent/GB704039A/en
Publication of GB704039A publication Critical patent/GB704039A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/08—Metering calls to called party, i.e. B-party charged for the communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

704,039. Automatic exchange systems. GENERAL ELECTRIC CO., Ltd., SCOWCROFT, J., and CHUBB, A. A. Sept. 26, 1952 [Nov. 5, 1951], No. 25869/51. Class 40 (4) In a subscriber's number identification system, wires characteristic of various subscribers are connected in non-numerical order to a bank of an identifying switch which is set in motion when an identifying signal appears on one of these wires ; the switch is stopped on the contact carrying the signal, and a signal code indicative of the corresponding subscriber's number is applied to the associated wire, the whole of the units of the code other than those (if any) representing the exchange being derived from the position of the switch. As shown, a calling subscriber is connected through a main distribution frame (M.D.F.), an intermediate distribution frame (I.D.F.), and a selector to an operator's position, Fig. 3. The operator plugs into jack JA and initiates identification by applying a positive potential to the ring connection. Relay MA is operated and applies a positive potential and a 10 kc/s signal to the P wire which is connected through the M wire and the local (non-numerical) side of the I.D.F. to a non-linear resistance NL. This becomes conductive and passes the current to an amplifier-receiver VA tuned to receive the 10 kc/s signalling frequency. Relay DD is operated and brings up relay DA. Meanwhile relay MB at the operator's position has operated slowly and now removes the positive potential from the P wire before it can operate the subscriber's meter. NL ceases to conduct and releases VA and DD. Relay DB operates in series with DA and connects VA to a wiper S1 of an identifying switch S which now commences stepping. When wiper S1 reaches a contact connected to the P wire of the calling line, which still carries the 10 kc/s signal, VA and DD are re-operated. Relay DC is energized to stop the switch S, release VA and DD, and connect wipers S2-S5 to wiper S1. A code of voice-frequency pulses indicative of the number of the calling line is thereby sent in known fashion over the M and P wires to produce a visual display at the operator's position or to operate an automatic charge register and printing device. Additional units of code representing the exchange may be added over lead EC. The system may also be used for identifying faulty lines. Specification 656,214 is referred to.
GB2586951A 1951-11-05 1951-11-05 Improvements in automatic telephone systems Expired GB704039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2586951A GB704039A (en) 1951-11-05 1951-11-05 Improvements in automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2586951A GB704039A (en) 1951-11-05 1951-11-05 Improvements in automatic telephone systems

Publications (1)

Publication Number Publication Date
GB704039A true GB704039A (en) 1954-02-17

Family

ID=10234687

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2586951A Expired GB704039A (en) 1951-11-05 1951-11-05 Improvements in automatic telephone systems

Country Status (1)

Country Link
GB (1) GB704039A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828140A (en) * 1972-12-22 1974-08-06 Bell Telephone Labor Inc Calling line identification system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828140A (en) * 1972-12-22 1974-08-06 Bell Telephone Labor Inc Calling line identification system

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