JPS5630338A - Signal change-over system - Google Patents

Signal change-over system

Info

Publication number
JPS5630338A
JPS5630338A JP10623579A JP10623579A JPS5630338A JP S5630338 A JPS5630338 A JP S5630338A JP 10623579 A JP10623579 A JP 10623579A JP 10623579 A JP10623579 A JP 10623579A JP S5630338 A JPS5630338 A JP S5630338A
Authority
JP
Japan
Prior art keywords
signal
stand
maintenance
signals
fault
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
JP10623579A
Other languages
Japanese (ja)
Inventor
Shohei Sato
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 JP10623579A priority Critical patent/JPS5630338A/en
Publication of JPS5630338A publication Critical patent/JPS5630338A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To change signals over rapidly by the fault-period in-use/stand-by change- over system of audio in-band signals on a time-division multiprocessing system, by providing each signal with a fault detecting circuit and by using a signal from this circuit for in-use/stand-by switching. CONSTITUTION:When leads 124 and 129 are set to ''1'' and ''0'' respectively, signals proceed to maintenance operation. With switch 130, maintenance transmission channel number is assigned and a 2,400Hz digital pattern, sent out of transmitter 117 in a 128ms period, has timing adjusted by shift register 115 or 116 and is applied to receiver 110. With switch 131, a maintenance reception channel number is assigned and a signal reception state read command for a receiving channel for maintenance is supplied at intervals of 32ms to check the reception state of the above-mentioned digital pattern. Then when not greater than two pulses or not less than five pulses are detected continuously at intervals of 32ms, for example, a decision on a signal fault is made and the in-use signal is changed over to a stand- by signal. Therefore, stand-by switching of signals can be performed rapidly without external controller.
JP10623579A 1979-08-21 1979-08-21 Signal change-over system Pending JPS5630338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10623579A JPS5630338A (en) 1979-08-21 1979-08-21 Signal change-over system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10623579A JPS5630338A (en) 1979-08-21 1979-08-21 Signal change-over system

Publications (1)

Publication Number Publication Date
JPS5630338A true JPS5630338A (en) 1981-03-26

Family

ID=14428452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10623579A Pending JPS5630338A (en) 1979-08-21 1979-08-21 Signal change-over system

Country Status (1)

Country Link
JP (1) JPS5630338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59182633A (en) * 1983-03-31 1984-10-17 Fujitsu Ltd Spare switching control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59182633A (en) * 1983-03-31 1984-10-17 Fujitsu Ltd Spare switching control system
JPH0381336B2 (en) * 1983-03-31 1991-12-27 Fujitsu Ltd

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