JPS5620365A - Fault detection system - Google Patents

Fault detection system

Info

Publication number
JPS5620365A
JPS5620365A JP9584479A JP9584479A JPS5620365A JP S5620365 A JPS5620365 A JP S5620365A JP 9584479 A JP9584479 A JP 9584479A JP 9584479 A JP9584479 A JP 9584479A JP S5620365 A JPS5620365 A JP S5620365A
Authority
JP
Japan
Prior art keywords
line
calling
key station
cex
constitution
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.)
Granted
Application number
JP9584479A
Other languages
Japanese (ja)
Other versions
JPS5857944B2 (en
Inventor
Hikari Masujima
Mamoru Chino
Hironori Yamatani
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 JP9584479A priority Critical patent/JPS5857944B2/en
Publication of JPS5620365A publication Critical patent/JPS5620365A/en
Publication of JPS5857944B2 publication Critical patent/JPS5857944B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
    • H04Q1/22—Automatic arrangements
    • H04Q1/26—Automatic arrangements for signalling trouble in unoccupied sub-exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To make it possible to detect the existence of a unit fault and also to simplify unit constitution by making a remote line concentrator perform normal call processing operation from a key station and then by receiving calling information on it by the key station. CONSTITUTION:When key station CEX calls subscriber's line (a) of sending-back circuit LBC, control circuit RL-CTL sends a calling signal to line (a). Subscriber's lines (a) and (b) are connected together and the state of a call from line (b) is set to put RL-CTL into operation, thereby informing key station CEX of the calling of line (b). Therefore, as far as remote line concentrator RLC is normal, calling in- formation to the calling is sent back from the key station.
JP9584479A 1979-07-27 1979-07-27 Fault detection method Expired JPS5857944B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9584479A JPS5857944B2 (en) 1979-07-27 1979-07-27 Fault detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9584479A JPS5857944B2 (en) 1979-07-27 1979-07-27 Fault detection method

Publications (2)

Publication Number Publication Date
JPS5620365A true JPS5620365A (en) 1981-02-25
JPS5857944B2 JPS5857944B2 (en) 1983-12-22

Family

ID=14148677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9584479A Expired JPS5857944B2 (en) 1979-07-27 1979-07-27 Fault detection method

Country Status (1)

Country Link
JP (1) JPS5857944B2 (en)

Also Published As

Publication number Publication date
JPS5857944B2 (en) 1983-12-22

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