GB839581A - Improvements relating to telephone systems - Google Patents

Improvements relating to telephone systems

Info

Publication number
GB839581A
GB839581A GB3684457A GB3684457A GB839581A GB 839581 A GB839581 A GB 839581A GB 3684457 A GB3684457 A GB 3684457A GB 3684457 A GB3684457 A GB 3684457A GB 839581 A GB839581 A GB 839581A
Authority
GB
United Kingdom
Prior art keywords
nov
improvements relating
telephone systems
wire
relay
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
GB3684457A
Inventor
Bernard Drake
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.)
Siemens Edison Swan Ltd
Original Assignee
Siemens Edison Swan Ltd
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 Siemens Edison Swan Ltd filed Critical Siemens Edison Swan Ltd
Priority to GB3684457A priority Critical patent/GB839581A/en
Publication of GB839581A publication Critical patent/GB839581A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/03—Hybrid circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Prepayment Telephone Systems (AREA)
  • Telephone Set Structure (AREA)

Abstract

839,581. Telephone transmission. SIEMENS EDISON SWAN Ltd. Nov. 21, 1958 [Nov. 26, 1957], No. 36844/57. Class 40 (4). At a tandem exchange wherein an incoming 4-wire junction is connected to an outgoing 4-wire junction by a 2-wire link TW, each terminating set comprises a hybrid coil HCP, HCQ with a balancing network and a repeating coil RCP, RCQ arranged as shown. A D.C signalling circuit exists over the primary windings of the repeating coils, polarized relay DD being energized by reversal of current when relay D (not shown) pulls up.
GB3684457A 1957-11-26 1957-11-26 Improvements relating to telephone systems Expired GB839581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3684457A GB839581A (en) 1957-11-26 1957-11-26 Improvements relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3684457A GB839581A (en) 1957-11-26 1957-11-26 Improvements relating to telephone systems

Publications (1)

Publication Number Publication Date
GB839581A true GB839581A (en) 1960-06-29

Family

ID=10391639

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3684457A Expired GB839581A (en) 1957-11-26 1957-11-26 Improvements relating to telephone systems

Country Status (1)

Country Link
GB (1) GB839581A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142429A (en) * 1990-05-07 1992-08-25 Telefonaktiebolaget L M Ericsson Overvoltage and overcurrent protective circuit with high earth balance
EP1031184A1 (en) * 1997-11-12 2000-08-30 Alcatel USA Sourcing, L.P. Front end interface circuit and method of tuning the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142429A (en) * 1990-05-07 1992-08-25 Telefonaktiebolaget L M Ericsson Overvoltage and overcurrent protective circuit with high earth balance
EP1031184A1 (en) * 1997-11-12 2000-08-30 Alcatel USA Sourcing, L.P. Front end interface circuit and method of tuning the same
EP1031184A4 (en) * 1997-11-12 2005-11-16 Alcatel Usa Sourcing Lp Front end interface circuit and method of tuning the same

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