JPS5499506A - Repeating monitor system - Google Patents

Repeating monitor system

Info

Publication number
JPS5499506A
JPS5499506A JP581978A JP581978A JPS5499506A JP S5499506 A JPS5499506 A JP S5499506A JP 581978 A JP581978 A JP 581978A JP 581978 A JP581978 A JP 581978A JP S5499506 A JPS5499506 A JP S5499506A
Authority
JP
Japan
Prior art keywords
signal
repeater
ssvk
case
frequency
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
JP581978A
Other languages
Japanese (ja)
Inventor
Masayuki Goto
Mamoru Endo
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP581978A priority Critical patent/JPS5499506A/en
Publication of JPS5499506A publication Critical patent/JPS5499506A/en
Pending 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)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To ensure an extremely quick detection of the faulty area as well as to reduce greatly the band width of the SV signal by generating the frequency proper to each repeater and sending it to the next step in case the SV signal is not received normally. CONSTITUTION:In case some fault takes place in repeater 14-(k - 1) which is just before repeater 14-K, repeater 14-K cannot receive the SM signal at input terminal 21-in. And SV signal monitor 32 detects this and then sends it own oscillation output to piling unit 23 through oscillator 24. Thus, the transmission signal of output terminal 21-out is turned into the composite signal of data signal Sd and SV signal SSVK of frequency fk. And if no fault is detected in the subsequent repeaters, signal SSVK is received at reception end office 12 in the form of the SV signal. Thus, the fault occurrence of repeater 14-(K - 1) can be detected at office 12 through viewing SSVK. In this case too, the SV signal running on the transmission line features frequency fk at the lower part of repeater 14-K and with an extremely band width.
JP581978A 1978-01-24 1978-01-24 Repeating monitor system Pending JPS5499506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP581978A JPS5499506A (en) 1978-01-24 1978-01-24 Repeating monitor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP581978A JPS5499506A (en) 1978-01-24 1978-01-24 Repeating monitor system

Publications (1)

Publication Number Publication Date
JPS5499506A true JPS5499506A (en) 1979-08-06

Family

ID=11621682

Family Applications (1)

Application Number Title Priority Date Filing Date
JP581978A Pending JPS5499506A (en) 1978-01-24 1978-01-24 Repeating monitor system

Country Status (1)

Country Link
JP (1) JPS5499506A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56103547A (en) * 1980-01-22 1981-08-18 Toshiba Corp Optical communication system
JPS62295532A (en) * 1986-06-14 1987-12-22 Nec Corp Line supervisory system
JPS63238746A (en) * 1987-03-26 1988-10-04 Nec Corp Trouble supervising system for transmission line signal
JPH07107055A (en) * 1993-10-05 1995-04-21 Nec Corp Fault detection circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56103547A (en) * 1980-01-22 1981-08-18 Toshiba Corp Optical communication system
JPS62295532A (en) * 1986-06-14 1987-12-22 Nec Corp Line supervisory system
JPH0644744B2 (en) * 1986-06-14 1994-06-08 日本電気株式会社 Line monitoring method
JPS63238746A (en) * 1987-03-26 1988-10-04 Nec Corp Trouble supervising system for transmission line signal
JPH07107055A (en) * 1993-10-05 1995-04-21 Nec Corp Fault detection circuit

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