JPS5577245A - Circuit supervisory system - Google Patents

Circuit supervisory system

Info

Publication number
JPS5577245A
JPS5577245A JP15089278A JP15089278A JPS5577245A JP S5577245 A JPS5577245 A JP S5577245A JP 15089278 A JP15089278 A JP 15089278A JP 15089278 A JP15089278 A JP 15089278A JP S5577245 A JPS5577245 A JP S5577245A
Authority
JP
Japan
Prior art keywords
station
supervised
supervisory
repeater
endmost
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.)
Granted
Application number
JP15089278A
Other languages
Japanese (ja)
Other versions
JPS5715500B2 (en
Inventor
Akimasa Yamazaki
Yoichiro Enami
Nobuhiro Bando
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15089278A priority Critical patent/JPS5577245A/en
Publication of JPS5577245A publication Critical patent/JPS5577245A/en
Publication of JPS5715500B2 publication Critical patent/JPS5715500B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To simplify a connection between stations with the number of wired bilateral transmission lines reduced by exercising a supervision over the endmost terminal station making use of level variation in pilot frequency, by folding a resistance supervisory line at a supervisory station right before the endmost terminal station of wired bilateral transmission lines. CONSTITUTION:Repeater 8 of supervisory station 1 is sequentially connected to repeaters 9 and 10 of station 2 to be supervised, and repeater 10 is connected to repeater 11 of endmost station 3 to be supervised; and repeater 11 of supervised station 3 is sequentially connected to repeaters 13 and 14 of supervised station 2, and repeater 14 is connected to repeater 15 of supervisory station 1. Further, resistance supervisory unit 7 of supervisory station 1 is connected to resistance supervisory line 6 exercising a supervision over the resistance value of each supervised station 2, and this resistance supervisory line 6 is foled at supervised station 2 right before endmost supervised station 3. Then, a supervision over the endmost supervised station 3 is exercised by making use of level variation of pilot frequencies F1 and F2 of up circuit 4 and down circuit 5 and the number of signal lines between supervised station 2 and endmost supervised station 3 provided with repeaters 10 and 13.
JP15089278A 1978-12-05 1978-12-05 Circuit supervisory system Granted JPS5577245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15089278A JPS5577245A (en) 1978-12-05 1978-12-05 Circuit supervisory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15089278A JPS5577245A (en) 1978-12-05 1978-12-05 Circuit supervisory system

Publications (2)

Publication Number Publication Date
JPS5577245A true JPS5577245A (en) 1980-06-10
JPS5715500B2 JPS5715500B2 (en) 1982-03-31

Family

ID=15506652

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15089278A Granted JPS5577245A (en) 1978-12-05 1978-12-05 Circuit supervisory system

Country Status (1)

Country Link
JP (1) JPS5577245A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS636648A (en) * 1986-06-27 1988-01-12 Nec Corp Bipolar storage circuit with error detecting function

Also Published As

Publication number Publication date
JPS5715500B2 (en) 1982-03-31

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