JPS54105404A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS54105404A
JPS54105404A JP1276478A JP1276478A JPS54105404A JP S54105404 A JPS54105404 A JP S54105404A JP 1276478 A JP1276478 A JP 1276478A JP 1276478 A JP1276478 A JP 1276478A JP S54105404 A JPS54105404 A JP S54105404A
Authority
JP
Japan
Prior art keywords
signal
carrier
data signal
light
data
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
JP1276478A
Other languages
Japanese (ja)
Inventor
Kaoru Fukushima
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP1276478A priority Critical patent/JPS54105404A/en
Publication of JPS54105404A publication Critical patent/JPS54105404A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Dc Digital Transmission (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To make it possible to exercise a supervision over the state of a signal path by performing transmission with a carrier inserted when a data signal is zero when sending binary data by light. CONSTITUTION:Carrier generator 2 operates with a data signal ''0'' and stops with the signal ''1''. Therefore, OR circuit 3 outputs the data signal or carrier signal. As a result, transistor 4 operates to flow a current to light emission diode 5. After passing through fiber 6, light from light emission diode 5 is converted into an electric signal by photo diode 7. The signal, after being waveform-shaped by comparator 8, is demodulated by monostable multivibrator 9 and then rectified 10 to be extracted as the detection signal of a transmission line. Namely, when neither the data signal nor carrier signal is obtained, the detecion is done regarding it as the abnormality of the transmission line.
JP1276478A 1978-02-06 1978-02-06 Data transmission system Pending JPS54105404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1276478A JPS54105404A (en) 1978-02-06 1978-02-06 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1276478A JPS54105404A (en) 1978-02-06 1978-02-06 Data transmission system

Publications (1)

Publication Number Publication Date
JPS54105404A true JPS54105404A (en) 1979-08-18

Family

ID=11814458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1276478A Pending JPS54105404A (en) 1978-02-06 1978-02-06 Data transmission system

Country Status (1)

Country Link
JP (1) JPS54105404A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58146151A (en) * 1982-02-24 1983-08-31 Mitsubishi Electric Corp Optical transmitter and receiver for digital signal transmission
US6239889B1 (en) 1997-10-22 2001-05-29 Nortel Networks Limited Optical signal power detection with signature bit pattern in WDM systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58146151A (en) * 1982-02-24 1983-08-31 Mitsubishi Electric Corp Optical transmitter and receiver for digital signal transmission
US6239889B1 (en) 1997-10-22 2001-05-29 Nortel Networks Limited Optical signal power detection with signature bit pattern in WDM systems

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