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JPS55136737A - Failure retrieval and monitor system for relay transmission line - Google Patents

Failure retrieval and monitor system for relay transmission line

Info

Publication number
JPS55136737A
JPS55136737A JP4466579A JP4466579A JPS55136737A JP S55136737 A JPS55136737 A JP S55136737A JP 4466579 A JP4466579 A JP 4466579A JP 4466579 A JP4466579 A JP 4466579A JP S55136737 A JPS55136737 A JP S55136737A
Authority
JP
Japan
Prior art keywords
terminal station
failure
monitor
signal
monitor signal
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
JP4466579A
Other languages
Japanese (ja)
Inventor
Tsutomu Takahashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4466579A priority Critical patent/JPS55136737A/en
Publication of JPS55136737A publication Critical patent/JPS55136737A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Landscapes

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

Abstract

PURPOSE:To perform failure retrieval simply by the synthesized signal f2+ or -f1 by transmitting two monitor signals f1, f2, from the terminal stations, synthesizing in the relay unit. CONSTITUTION:In the relay transmission system of one line bidirectional method, the line monitor signal f1 is transmitted from one terminal station (low group transmission terminal station etc.) and the monitor signal f2 is from another terminal station (high group transmission terminal station etc.). The band pass filters 201, 202 the signals f1, f2 and produce the failure retrieval and monitor signal of f2+ or -f1 in the frequency converter 203. The signal is coupled at the output point of the low and high group amplifiers 105, 106, and f2-f1 is given to the low group band and f2+f1 is to the high group band. Accordingly, the number of relay units and failure can be monitored at each reception terminal station by only detecting the level of the failure retrieval and monitor signal. Further, the frequency of the failure retrieval and monitor signal is single enough to monitor the entire relay units, the occupied area can be less, and the line can effectively be used.
JP4466579A 1979-04-12 1979-04-12 Failure retrieval and monitor system for relay transmission line Pending JPS55136737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4466579A JPS55136737A (en) 1979-04-12 1979-04-12 Failure retrieval and monitor system for relay transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4466579A JPS55136737A (en) 1979-04-12 1979-04-12 Failure retrieval and monitor system for relay transmission line

Publications (1)

Publication Number Publication Date
JPS55136737A true JPS55136737A (en) 1980-10-24

Family

ID=12697737

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4466579A Pending JPS55136737A (en) 1979-04-12 1979-04-12 Failure retrieval and monitor system for relay transmission line

Country Status (1)

Country Link
JP (1) JPS55136737A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058103A (en) * 1988-11-08 1991-10-15 Fujitsu Limited Bidirectional optical transmission system having a light-interruption detecting function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058103A (en) * 1988-11-08 1991-10-15 Fujitsu Limited Bidirectional optical transmission system having a light-interruption detecting function

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