JPS57160231A - In-use and stand-by switching device - Google Patents

In-use and stand-by switching device

Info

Publication number
JPS57160231A
JPS57160231A JP4562481A JP4562481A JPS57160231A JP S57160231 A JPS57160231 A JP S57160231A JP 4562481 A JP4562481 A JP 4562481A JP 4562481 A JP4562481 A JP 4562481A JP S57160231 A JPS57160231 A JP S57160231A
Authority
JP
Japan
Prior art keywords
stand
relays
switching
circuit
systems
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.)
Pending
Application number
JP4562481A
Other languages
Japanese (ja)
Inventor
Toshio Ikeda
Yuzo Fujii
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP4562481A priority Critical patent/JPS57160231A/en
Publication of JPS57160231A publication Critical patent/JPS57160231A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/74—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 for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To reduce transmission loss and impedance mismatching by providing an auxiliary relay group, which corresponds to one transfer type relay, to every two systems of stand-by side outputs of a transfer type main relay group. CONSTITUTION:In a switching circuit 2 which connects one stand-by system to, for example, four in-use systems, transmission lines 11-14 are provided with main relays RL1-RL4 for switching input signals, and in-use circuits 31-34 are connected to their one-side contacts. Conductors extending from the other-side contacts of the main relays are connected to auxiliary relays RL1-1 and RL1-2 of the 1st stage respectively. The common terminal of the RL1-1 and RL1-2 is connected to the auxiliary relay RL2-1 of the 2nd stage, whose common terminal is connected to a stand-by system circuit 4. When the in-use circuit 31 has a fault, the transmission line 11 is connected to the stand-by system 4 through the RL1, RL1-1 and RL2-1, and the contact of the RL1 is made independent of the other in-use systems; and the number of switching relays is decreased, and transmission loss and impedance mismatching during switching are reduced, lower the error rate of a transmitted signal.
JP4562481A 1981-03-30 1981-03-30 In-use and stand-by switching device Pending JPS57160231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4562481A JPS57160231A (en) 1981-03-30 1981-03-30 In-use and stand-by switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4562481A JPS57160231A (en) 1981-03-30 1981-03-30 In-use and stand-by switching device

Publications (1)

Publication Number Publication Date
JPS57160231A true JPS57160231A (en) 1982-10-02

Family

ID=12724518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4562481A Pending JPS57160231A (en) 1981-03-30 1981-03-30 In-use and stand-by switching device

Country Status (1)

Country Link
JP (1) JPS57160231A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544154A1 (en) * 1983-04-05 1984-10-12 Norway Geophysical Co DATA TRANSMISSION SYSTEM FOR SEISMIC FLUTES
JPH07297762A (en) * 1994-04-27 1995-11-10 Nec Corp Line changeover device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544154A1 (en) * 1983-04-05 1984-10-12 Norway Geophysical Co DATA TRANSMISSION SYSTEM FOR SEISMIC FLUTES
JPH07297762A (en) * 1994-04-27 1995-11-10 Nec Corp Line changeover device

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