JPS5728459A - System switching system - Google Patents

System switching system

Info

Publication number
JPS5728459A
JPS5728459A JP10246680A JP10246680A JPS5728459A JP S5728459 A JPS5728459 A JP S5728459A JP 10246680 A JP10246680 A JP 10246680A JP 10246680 A JP10246680 A JP 10246680A JP S5728459 A JPS5728459 A JP S5728459A
Authority
JP
Japan
Prior art keywords
signal
system switching
gate
circuit
inputted
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
JP10246680A
Other languages
Japanese (ja)
Inventor
Tomihisa Nishijima
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 JP10246680A priority Critical patent/JPS5728459A/en
Publication of JPS5728459A publication Critical patent/JPS5728459A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised

Landscapes

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

Abstract

PURPOSE:To make a spare system start as an existing system surely, by outputting a system switching signal repetitively, if no system switching is made after a given time. CONSTITUTION:When a failure is taken place at a central controller 4A and a failure state display signal AL is transmitted, this illuminates a lamp corresponding to a failure display circuit 68A and it is inputted to an AND gate 62A via an OR gate 61A and immediately inputted to a system switching start circuit 63A. The circuit 63A transmits a system switching signal ST to operate the system B as an existing system. If the signal ST can not be delivered to a central controller 4B due to any cause, after a given time passes from the input of the signal AL to the system switching start circuit 63A, the system switching signal ST is again outputted from a delay circuit 65A and this is inputted to the central controller 4B via an AND gate 66A and an OR gate 64A.
JP10246680A 1980-07-28 1980-07-28 System switching system Pending JPS5728459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10246680A JPS5728459A (en) 1980-07-28 1980-07-28 System switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10246680A JPS5728459A (en) 1980-07-28 1980-07-28 System switching system

Publications (1)

Publication Number Publication Date
JPS5728459A true JPS5728459A (en) 1982-02-16

Family

ID=14328227

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10246680A Pending JPS5728459A (en) 1980-07-28 1980-07-28 System switching system

Country Status (1)

Country Link
JP (1) JPS5728459A (en)

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