JPS5365611A - Specified telephone switching device - Google Patents

Specified telephone switching device

Info

Publication number
JPS5365611A
JPS5365611A JP14189576A JP14189576A JPS5365611A JP S5365611 A JPS5365611 A JP S5365611A JP 14189576 A JP14189576 A JP 14189576A JP 14189576 A JP14189576 A JP 14189576A JP S5365611 A JPS5365611 A JP S5365611A
Authority
JP
Japan
Prior art keywords
switching device
specified telephone
telephone switching
switching
specified
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
JP14189576A
Other languages
Japanese (ja)
Inventor
Koichi Mizuno
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP14189576A priority Critical patent/JPS5365611A/en
Publication of JPS5365611A publication Critical patent/JPS5365611A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To ensure a switching of a specified circuit to a specified telephone by securing switching of the specified telephone before a fault occurrence only when it is not used and also securing switching when non-use state is obtained in case the specific telephone is under being used, by use of a response switch, circuit switching relay, etc.
JP14189576A 1976-11-25 1976-11-25 Specified telephone switching device Pending JPS5365611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14189576A JPS5365611A (en) 1976-11-25 1976-11-25 Specified telephone switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14189576A JPS5365611A (en) 1976-11-25 1976-11-25 Specified telephone switching device

Publications (1)

Publication Number Publication Date
JPS5365611A true JPS5365611A (en) 1978-06-12

Family

ID=15302653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14189576A Pending JPS5365611A (en) 1976-11-25 1976-11-25 Specified telephone switching device

Country Status (1)

Country Link
JP (1) JPS5365611A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887951A (en) * 1981-11-19 1983-05-25 Nec Corp Operation switching system at failure of electronic exchange

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887951A (en) * 1981-11-19 1983-05-25 Nec Corp Operation switching system at failure of electronic exchange

Similar Documents

Publication Publication Date Title
JPS5365611A (en) Specified telephone switching device
FR2275016A1 (en) Protective circuit breaker with test key - has resistor between summation transformer primary and secondary circuits
JPS5347722A (en) Key input circuit
JPS5363541A (en) Enclosed switch
JPS5217762A (en) Monitoring circuit of operating relays condition
JPS52154051A (en) Enclosed switchboard
JPS5315051A (en) Chattering absorbing circuit of contacts
JPS5310039A (en) Leak breaker operation indicating device with protective lamp
JPS53911A (en) Speech current disconnection circuit
JPS53101241A (en) Transmission control device
JPS52115149A (en) Antenna changeover device
JPS53955A (en) Chattering prevention circuit
JPS526100A (en) Operation indication device for switch
JPS5493434A (en) Voltage switching circuit
JPS5341913A (en) Talking current cut-off circuit
JPS53961A (en) A.c. timer circuit
JPS52100803A (en) Call wating system
JPS51135356A (en) C-mos switch circuit
JPS5330207A (en) Telephone exchange unit
JPS51140505A (en) Selecting station operation mode automatic switching device
JPS5330547A (en) Device for controlling automotive cooler
JPS5321402A (en) Automatic operating device of pump
JPS52101907A (en) Shunt type current switching scanning method
JPS5698066A (en) Talking device
JPS52101903A (en) Forecasting tone sending method