JPS54109711A - Circuit alarm generating system - Google Patents

Circuit alarm generating system

Info

Publication number
JPS54109711A
JPS54109711A JP1590578A JP1590578A JPS54109711A JP S54109711 A JPS54109711 A JP S54109711A JP 1590578 A JP1590578 A JP 1590578A JP 1590578 A JP1590578 A JP 1590578A JP S54109711 A JPS54109711 A JP S54109711A
Authority
JP
Japan
Prior art keywords
signal
circuit
amplifier
monitor signal
circuit monitor
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
JP1590578A
Other languages
Japanese (ja)
Inventor
Seiji Kinoshita
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1590578A priority Critical patent/JPS54109711A/en
Publication of JPS54109711A publication Critical patent/JPS54109711A/en
Pending legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Exchanges (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE: To ensure the steady circuit monitoring even though the circuit monitor signal is cut off temporarily by sending the circuit monitor signal extracted through the reception amplifier back to the transmission amplifier via the up-circuit.
CONSTITUTION: The circuit monitor signal generated from circuit monitor signal generator 5 is piled on the normal signal at the transmission terminal and then led to the repeating transmission via converter 1. At the repeating transmission line, the circuit monitor signal is extracted through transmission amplifier 2 to be used as the S signal. At the same time, the circuit monitor signal is extracted also through reception amplifier 2 and then sent back to amplifier 2 to be used as signal S'. At amplifier 2, signal S and S' are collated through comparison comparator 7, and the circuit alarm is given only in case signal S exists normally and signal S' is cut off.
COPYRIGHT: (C)1979,JPO&Japio
JP1590578A 1978-02-16 1978-02-16 Circuit alarm generating system Pending JPS54109711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1590578A JPS54109711A (en) 1978-02-16 1978-02-16 Circuit alarm generating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1590578A JPS54109711A (en) 1978-02-16 1978-02-16 Circuit alarm generating system

Publications (1)

Publication Number Publication Date
JPS54109711A true JPS54109711A (en) 1979-08-28

Family

ID=11901780

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1590578A Pending JPS54109711A (en) 1978-02-16 1978-02-16 Circuit alarm generating system

Country Status (1)

Country Link
JP (1) JPS54109711A (en)

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