JPS53143108A - Monitoring system for extension lockout - Google Patents

Monitoring system for extension lockout

Info

Publication number
JPS53143108A
JPS53143108A JP5756877A JP5756877A JPS53143108A JP S53143108 A JPS53143108 A JP S53143108A JP 5756877 A JP5756877 A JP 5756877A JP 5756877 A JP5756877 A JP 5756877A JP S53143108 A JPS53143108 A JP S53143108A
Authority
JP
Japan
Prior art keywords
lockout
extension
monitoring system
line
line relays
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
JP5756877A
Other languages
Japanese (ja)
Inventor
Shuichi Hashimoto
Shiyuuji Oka
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 JP5756877A priority Critical patent/JPS53143108A/en
Publication of JPS53143108A publication Critical patent/JPS53143108A/en
Pending 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)

Abstract

PURPOSE:To reduce power consumption and to prevent heating of line relays, by decreasing the operating time of line relays, through monitoring the restoration of the line relays at the connection between subscribers and line circuits.
JP5756877A 1977-05-20 1977-05-20 Monitoring system for extension lockout Pending JPS53143108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5756877A JPS53143108A (en) 1977-05-20 1977-05-20 Monitoring system for extension lockout

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5756877A JPS53143108A (en) 1977-05-20 1977-05-20 Monitoring system for extension lockout

Publications (1)

Publication Number Publication Date
JPS53143108A true JPS53143108A (en) 1978-12-13

Family

ID=13059431

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5756877A Pending JPS53143108A (en) 1977-05-20 1977-05-20 Monitoring system for extension lockout

Country Status (1)

Country Link
JP (1) JPS53143108A (en)

Similar Documents

Publication Publication Date Title
JPS53143108A (en) Monitoring system for extension lockout
JPS53117181A (en) Sequence controller
JPS5386502A (en) Control unit for telephone circuit netwoek
JPS53136741A (en) High frequency wave heating device
JPS5416953A (en) Input current monitor system
JPS5360506A (en) Circuit control system
JPS53133349A (en) Terminal control unit for central control unit at fault occurrence time
JPS5391633A (en) Line printer
JPS52153350A (en) Fail-safe unit for controlling calculator
JPS53146148A (en) Remote control system
JPS53114658A (en) Delay timer circuit
JPS53118358A (en) Delay timer circuit
JPS5367853A (en) Power-factor controlling apparatus
JPS5216114A (en) Connection system of telephone exchanger
JPS5410952A (en) Display apparatus
JPS5384511A (en) Line concentrator
JPS544007A (en) Identifying system of two terminals and two common subscribers
JPS5394841A (en) Switching system for circuit corresponding part of communication control un it
JPS5215205A (en) Power failure monitor circuit for key telephone system
JPS5317202A (en) Magnetron power supply device
JPS5386504A (en) Dividing system for office b-board channel
JPS5391639A (en) Power supply system in i/o interface circuit
JPS5340207A (en) Stand-by unit switching system
JPS5296806A (en) Common control unit starting system
JPS5371501A (en) Individual-selection and call receiver