JPS5789342A - Monitor system - Google Patents

Monitor system

Info

Publication number
JPS5789342A
JPS5789342A JP55164504A JP16450480A JPS5789342A JP S5789342 A JPS5789342 A JP S5789342A JP 55164504 A JP55164504 A JP 55164504A JP 16450480 A JP16450480 A JP 16450480A JP S5789342 A JPS5789342 A JP S5789342A
Authority
JP
Japan
Prior art keywords
sent
signal
switching
driving part
light
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
JP55164504A
Other languages
Japanese (ja)
Inventor
Hiroshi Nishimoto
Mitsuhiro Motegi
Fumio Ogawa
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 JP55164504A priority Critical patent/JPS5789342A/en
Publication of JPS5789342A publication Critical patent/JPS5789342A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To warn beforehand a momentary disconnection accompanied with switching of a light emitter, by providing oscillators of different frequencies in respective repeaters to generate a monitor signal for switching of the light emitter. CONSTITUTION:The digital signal received by a light receiver 12 is amplified by an amplifier 13 and is regenerated to a DC by a DC regenerator 14 and is supplied to an discriminator 16 through an equalizer 15 and is sent to a driving part 18 synchronously with the output of a timing regenerating circuit 17. Meanwhile, an analogue signal is sent to the driving part 18 through a filter 19 and an amplifier 20. The output of the driving part 18 is sent to a fiber 11b through one of light emitters 5a-5d which is switched by a switching part 21. The switching part 21 monitors the operation of light emitters; and if they are degraded, an oscillator 22 is oscillated to generate a monitor signal. This signal is separated from the transmission signal in each repeater by the filter 19 and the equalizer 15 and by-passes a digital processing part and is sent to a terminal station.
JP55164504A 1980-11-25 1980-11-25 Monitor system Pending JPS5789342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55164504A JPS5789342A (en) 1980-11-25 1980-11-25 Monitor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55164504A JPS5789342A (en) 1980-11-25 1980-11-25 Monitor system

Publications (1)

Publication Number Publication Date
JPS5789342A true JPS5789342A (en) 1982-06-03

Family

ID=15794407

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55164504A Pending JPS5789342A (en) 1980-11-25 1980-11-25 Monitor system

Country Status (1)

Country Link
JP (1) JPS5789342A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02186846A (en) * 1989-01-13 1990-07-23 Nec Corp Optical submarine repeater
JPH02223237A (en) * 1989-02-23 1990-09-05 Nec Corp Optical submarine repeater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02186846A (en) * 1989-01-13 1990-07-23 Nec Corp Optical submarine repeater
JPH02223237A (en) * 1989-02-23 1990-09-05 Nec Corp Optical submarine repeater

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