JPS5738046A - Retrieving system for failure relay device - Google Patents

Retrieving system for failure relay device

Info

Publication number
JPS5738046A
JPS5738046A JP11378380A JP11378380A JPS5738046A JP S5738046 A JPS5738046 A JP S5738046A JP 11378380 A JP11378380 A JP 11378380A JP 11378380 A JP11378380 A JP 11378380A JP S5738046 A JPS5738046 A JP S5738046A
Authority
JP
Japan
Prior art keywords
failure
circuit
relay device
frequency
gate
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
JP11378380A
Other languages
Japanese (ja)
Other versions
JPS5920304B2 (en
Inventor
Nobuyuki Tokura
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55113783A priority Critical patent/JPS5920304B2/en
Publication of JPS5738046A publication Critical patent/JPS5738046A/en
Publication of JPS5920304B2 publication Critical patent/JPS5920304B2/en
Expired 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
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/403—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local oscillators

Landscapes

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

Abstract

PURPOSE:To achieve the orientation of failed position with a simple constitution, by constituting a timing extracting circuit with an elastic surface wave filter, oscillating this circut in frequencies inherent to the station itself at failure, and detecting this oscillatin frequency at monitor station. CONSTITUTION:When a failure is produced to a preceding relay device or transmission line and applied to an input terminal IN, the level of PCM signals is interrupted. The gain of an AGC circuit is maximum and the output of an equalizing amplifier EQ is noise only. A signal failure detector DET detects this state as failure and the output opens an AND gate G. When the gate G is opened, an elastic surface wave filter SAWFIL of a timing extracting circuit, a limiter LIMAMP, and a phase shift circuit PS operate as an oscillation circuit. This oscillation frequency is set to frequencies inherent to the station itself with the phase shift circuit PS and a monitor station can know the relay device or transmission line failed, by checking the frequency.
JP55113783A 1980-08-19 1980-08-19 Fault repeater search method Expired JPS5920304B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55113783A JPS5920304B2 (en) 1980-08-19 1980-08-19 Fault repeater search method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55113783A JPS5920304B2 (en) 1980-08-19 1980-08-19 Fault repeater search method

Publications (2)

Publication Number Publication Date
JPS5738046A true JPS5738046A (en) 1982-03-02
JPS5920304B2 JPS5920304B2 (en) 1984-05-12

Family

ID=14620983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55113783A Expired JPS5920304B2 (en) 1980-08-19 1980-08-19 Fault repeater search method

Country Status (1)

Country Link
JP (1) JPS5920304B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229556A (en) * 1984-04-27 1985-11-14 Nec Corp Locating system for fault point on digital light signal transmission line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229556A (en) * 1984-04-27 1985-11-14 Nec Corp Locating system for fault point on digital light signal transmission line

Also Published As

Publication number Publication date
JPS5920304B2 (en) 1984-05-12

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