JPS57174964A - Reproducing repeater failure retrieval system and reproducing repeater - Google Patents

Reproducing repeater failure retrieval system and reproducing repeater

Info

Publication number
JPS57174964A
JPS57174964A JP5914781A JP5914781A JPS57174964A JP S57174964 A JPS57174964 A JP S57174964A JP 5914781 A JP5914781 A JP 5914781A JP 5914781 A JP5914781 A JP 5914781A JP S57174964 A JPS57174964 A JP S57174964A
Authority
JP
Japan
Prior art keywords
repeater
retrieval
signal
terminal
terminal station
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
JP5914781A
Other languages
Japanese (ja)
Inventor
Shigeji Kameyama
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 JP5914781A priority Critical patent/JPS57174964A/en
Publication of JPS57174964A publication Critical patent/JPS57174964A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/405—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local multipliers, dividers, modulators

Abstract

PURPOSE:To extend the range of retrieval, by returning a signal modulating a mark rate or pulse polarity of a reverse transmission line to a terminal station with a retrieval information signal picked up with a band pass filter connected to a repeater. CONSTITUTION:A retrieval code is outputted to a line from a terminal station A. A repeater 7 identifies a reception signal at a discriminating circuit 9. In this case, if no modulation signal is given to a terminal 18, the output of the circuit 9 is reproduced. A retrieval code train is picked up at a flip-flop from this reproduced output. This signal is applied to a modulation input terminal 16 of a descending repeater. As a result, an exclusive logical sum of the retrieval code train outputted from terminal stations B and A is obtained. This code train is returned to the terminal station A. The terminal station A monitors the frequency component of the code train returend at a reception section 42 and finds out a failure of the repeater.
JP5914781A 1981-04-21 1981-04-21 Reproducing repeater failure retrieval system and reproducing repeater Pending JPS57174964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5914781A JPS57174964A (en) 1981-04-21 1981-04-21 Reproducing repeater failure retrieval system and reproducing repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5914781A JPS57174964A (en) 1981-04-21 1981-04-21 Reproducing repeater failure retrieval system and reproducing repeater

Publications (1)

Publication Number Publication Date
JPS57174964A true JPS57174964A (en) 1982-10-27

Family

ID=13104926

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5914781A Pending JPS57174964A (en) 1981-04-21 1981-04-21 Reproducing repeater failure retrieval system and reproducing repeater

Country Status (1)

Country Link
JP (1) JPS57174964A (en)

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