GB1412420A - Signal transmission systems - Google Patents

Signal transmission systems

Info

Publication number
GB1412420A
GB1412420A GB666472A GB666472A GB1412420A GB 1412420 A GB1412420 A GB 1412420A GB 666472 A GB666472 A GB 666472A GB 666472 A GB666472 A GB 666472A GB 1412420 A GB1412420 A GB 1412420A
Authority
GB
United Kingdom
Prior art keywords
current
earth
repeaters
balanced
signal transmission
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
GB666472A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB666472A priority Critical patent/GB1412420A/en
Publication of GB1412420A publication Critical patent/GB1412420A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/44—Arrangements for feeding power to a repeater along the transmission line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

1412420 Repeater power supplies MARCONI CO Ltd 21 Dec 1972 ]12 Feb 1972] 6664/72 Heading H4R Current flowing between earth and the floating nominal earth point 40 of a balanced power supply 35A, 35B for repeaters 1-14, 16-29 is detected 41 and utilized 42 to reduce the earth current to zero whilst maintaining constant loop current to power the repeaters. Any other balanced supplies 36A, 36B have earthed centre points 38. Detected current above a threshold indicates a fault in one of the supply sections 35A, 35B.
GB666472A 1972-02-12 1972-02-12 Signal transmission systems Expired GB1412420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB666472A GB1412420A (en) 1972-02-12 1972-02-12 Signal transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB666472A GB1412420A (en) 1972-02-12 1972-02-12 Signal transmission systems

Publications (1)

Publication Number Publication Date
GB1412420A true GB1412420A (en) 1975-11-05

Family

ID=9818572

Family Applications (1)

Application Number Title Priority Date Filing Date
GB666472A Expired GB1412420A (en) 1972-02-12 1972-02-12 Signal transmission systems

Country Status (1)

Country Link
GB (1) GB1412420A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6614632B1 (en) 1998-12-30 2003-09-02 Alcatel Powerfeed for a submarine communications system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6614632B1 (en) 1998-12-30 2003-09-02 Alcatel Powerfeed for a submarine communications system

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee