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JPS5660122A - Circuit switching circuit - Google Patents

Circuit switching circuit

Info

Publication number
JPS5660122A
JPS5660122A JP13578379A JP13578379A JPS5660122A JP S5660122 A JPS5660122 A JP S5660122A JP 13578379 A JP13578379 A JP 13578379A JP 13578379 A JP13578379 A JP 13578379A JP S5660122 A JPS5660122 A JP S5660122A
Authority
JP
Japan
Prior art keywords
circuit
switching
signal
inputted
over
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
JP13578379A
Other languages
Japanese (ja)
Inventor
Tokuhiro Kawakami
Kiyoshi Inoue
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 JP13578379A priority Critical patent/JPS5660122A/en
Publication of JPS5660122A publication Critical patent/JPS5660122A/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)

Abstract

PURPOSE:To fulfill miniaturization by changing a circuit over by a switching unit by receiving an alarm signal from each terminal equipment. CONSTITUTION:When a fault occurs in circuit A, a received fault alarm signal from the terminal station is inputted to terminal 8 and alarm receiving relay 17 is operated. Through the operation, switching transistor 18 is turned on to supply the signal to malfunction preventing FF19. After a confirmation time of 300ms passes since the occurrence of the fault, FF19 sends a signal. This signal is inputted to switching self-holding FF22, whose output state is inverted to operate circuit switching relay 14, thereby changing circuit A over to circuit B. When the circuit is changed over manually, depressing circuit-switching switches 16A and 16B puts switching transistors 18A and 18B into operation and their signals are inputted to set and preset terminals of FF22, so that the circuit is changed over.
JP13578379A 1979-10-19 1979-10-19 Circuit switching circuit Pending JPS5660122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13578379A JPS5660122A (en) 1979-10-19 1979-10-19 Circuit switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13578379A JPS5660122A (en) 1979-10-19 1979-10-19 Circuit switching circuit

Publications (1)

Publication Number Publication Date
JPS5660122A true JPS5660122A (en) 1981-05-23

Family

ID=15159738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13578379A Pending JPS5660122A (en) 1979-10-19 1979-10-19 Circuit switching circuit

Country Status (1)

Country Link
JP (1) JPS5660122A (en)

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