JPS5356908A - Preventive system of main wire service cut-off at power failure time - Google Patents

Preventive system of main wire service cut-off at power failure time

Info

Publication number
JPS5356908A
JPS5356908A JP13054876A JP13054876A JPS5356908A JP S5356908 A JPS5356908 A JP S5356908A JP 13054876 A JP13054876 A JP 13054876A JP 13054876 A JP13054876 A JP 13054876A JP S5356908 A JPS5356908 A JP S5356908A
Authority
JP
Japan
Prior art keywords
main wire
power failure
failure time
wire service
preventive system
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
JP13054876A
Other languages
Japanese (ja)
Other versions
JPS5728236B2 (en
Inventor
Juichi Shimamori
Yoshio Ohashi
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP13054876A priority Critical patent/JPS5356908A/en
Publication of JPS5356908A publication Critical patent/JPS5356908A/en
Publication of JPS5728236B2 publication Critical patent/JPS5728236B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To improve service with returning the service in call back to the main wire and preventing the service to the main wire from being cut off at a power failure time, by detecting the operating voltage drop of an exchange.
JP13054876A 1976-11-01 1976-11-01 Preventive system of main wire service cut-off at power failure time Granted JPS5356908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13054876A JPS5356908A (en) 1976-11-01 1976-11-01 Preventive system of main wire service cut-off at power failure time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13054876A JPS5356908A (en) 1976-11-01 1976-11-01 Preventive system of main wire service cut-off at power failure time

Publications (2)

Publication Number Publication Date
JPS5356908A true JPS5356908A (en) 1978-05-23
JPS5728236B2 JPS5728236B2 (en) 1982-06-15

Family

ID=15036904

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13054876A Granted JPS5356908A (en) 1976-11-01 1976-11-01 Preventive system of main wire service cut-off at power failure time

Country Status (1)

Country Link
JP (1) JPS5356908A (en)

Also Published As

Publication number Publication date
JPS5728236B2 (en) 1982-06-15

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