JPS5660121A - Circuit switching system - Google Patents

Circuit switching system

Info

Publication number
JPS5660121A
JPS5660121A JP13578279A JP13578279A JPS5660121A JP S5660121 A JPS5660121 A JP S5660121A JP 13578279 A JP13578279 A JP 13578279A JP 13578279 A JP13578279 A JP 13578279A JP S5660121 A JPS5660121 A JP S5660121A
Authority
JP
Japan
Prior art keywords
circuit
alarm
signals
response
alarm signals
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
JP13578279A
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 JP13578279A priority Critical patent/JPS5660121A/en
Publication of JPS5660121A publication Critical patent/JPS5660121A/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 miniaturize a transmitter that includes a switch by exercising switching control in response to an alarm received from a terminal equipment. CONSTITUTION:When A circuit 20 is cut off, terminal equipments 21 and 24 send alarm signals to alarm receiving terminals 12 and 16 of circuit switches 25 and 26 as earth signals. In response to those alarm signals, logic circuits 13 and 17 of both the switches operate relays 14 and 18 to switch relay contacts 15 and 19. Consequently, A circuit 20 is changed over to B circuit 22. By the ceasing of alarm signals generated by terminal equipments 21 and 24, it can be made sure that the switching of both stations 25 and 26 is completed and a normal transmission line is constituted.
JP13578279A 1979-10-19 1979-10-19 Circuit switching system Pending JPS5660121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13578279A JPS5660121A (en) 1979-10-19 1979-10-19 Circuit switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13578279A JPS5660121A (en) 1979-10-19 1979-10-19 Circuit switching system

Publications (1)

Publication Number Publication Date
JPS5660121A true JPS5660121A (en) 1981-05-23

Family

ID=15159718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13578279A Pending JPS5660121A (en) 1979-10-19 1979-10-19 Circuit switching system

Country Status (1)

Country Link
JP (1) JPS5660121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61131921A (en) * 1984-11-30 1986-06-19 Nec Eng Ltd Backup system by radio equipment at important line is at fault
US5278989A (en) * 1990-01-18 1994-01-11 Andrew Corporation Distributed amplifier network management system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61131921A (en) * 1984-11-30 1986-06-19 Nec Eng Ltd Backup system by radio equipment at important line is at fault
US5278989A (en) * 1990-01-18 1994-01-11 Andrew Corporation Distributed amplifier network management system

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