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JPS564949A - Transmission system for previous-arrangement supervisory signal - Google Patents

Transmission system for previous-arrangement supervisory signal

Info

Publication number
JPS564949A
JPS564949A JP8043679A JP8043679A JPS564949A JP S564949 A JPS564949 A JP S564949A JP 8043679 A JP8043679 A JP 8043679A JP 8043679 A JP8043679 A JP 8043679A JP S564949 A JPS564949 A JP S564949A
Authority
JP
Japan
Prior art keywords
signal
previous
pcm
arrangement
supervisory signal
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
JP8043679A
Other languages
Japanese (ja)
Inventor
Takashi Kihara
Akira Miyata
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 JP8043679A priority Critical patent/JPS564949A/en
Publication of JPS564949A publication Critical patent/JPS564949A/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
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/074—Monitoring an optical transmission system using a supervisory signal using a superposed, over-modulated signal

Landscapes

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

Abstract

PURPOSE:To improve S/N while making it possible to transmit a previous-arrangement supervisory signal by using the same transmission line a main signal by PCM- modulating the previous arrangement supervisory signal and also by amplitudemodulating the main signal by the output. CONSTITUTION:A previous-arrangement supervisory signal applied from terminal 1 consists of an analog signal of 0.3-3.4kHz and is converted by A/D converting circuit 2 into a PCM signal of 64kb/s, for example. On the other hand, a main signal (PCM signal of tens - hundreds Mb/s) applied from terminal 3 is supplied to amplitude modulating circuit 4 for pulse amplitude modulation using the PCM-modulated prearrangement supervisory signal from circuit 2 and after amplification 5, light emitting device 6 is driven to generate and send a photosignal out of 7. On the other hand, the main signal with the superposed previous-arrangement supervisory signal input to terminal 11 is converted at 12 into an electric signal, which is amplified at 13 and discriminated and reproduced at 4 to obtain main signal output 15. Further, the output of amplifying circuit 13 has it peak value detected at 16 and the previous-arrangement supervisory signal PCM-modulated through LPF17 and discriminating circuit 18 is converted at 19 into an analog signal, so that the original previous-arrangement supervisory signal will be reproduced.
JP8043679A 1979-06-26 1979-06-26 Transmission system for previous-arrangement supervisory signal Pending JPS564949A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8043679A JPS564949A (en) 1979-06-26 1979-06-26 Transmission system for previous-arrangement supervisory signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8043679A JPS564949A (en) 1979-06-26 1979-06-26 Transmission system for previous-arrangement supervisory signal

Publications (1)

Publication Number Publication Date
JPS564949A true JPS564949A (en) 1981-01-19

Family

ID=13718203

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8043679A Pending JPS564949A (en) 1979-06-26 1979-06-26 Transmission system for previous-arrangement supervisory signal

Country Status (1)

Country Link
JP (1) JPS564949A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6037846A (en) * 1983-08-09 1985-02-27 Fujitsu Ltd Meeting line signal transmission method
US4608488A (en) * 1982-08-24 1986-08-26 Tokyo Shibaura Denki Kabushiki Kaisha Document issuing apparatus
JPH05244046A (en) * 1991-04-02 1993-09-21 Nec Corp Monitor signal superposition system
JP2015136086A (en) * 2014-01-20 2015-07-27 日立金属株式会社 Optical communication module, and transmission and reception system using the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4608488A (en) * 1982-08-24 1986-08-26 Tokyo Shibaura Denki Kabushiki Kaisha Document issuing apparatus
JPS6037846A (en) * 1983-08-09 1985-02-27 Fujitsu Ltd Meeting line signal transmission method
JPH0454410B2 (en) * 1983-08-09 1992-08-31 Fujitsu Ltd
JPH05244046A (en) * 1991-04-02 1993-09-21 Nec Corp Monitor signal superposition system
JP2015136086A (en) * 2014-01-20 2015-07-27 日立金属株式会社 Optical communication module, and transmission and reception system using the same

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