JPS5651143A - Detection system for abnomaly of digital signal transmission device - Google Patents

Detection system for abnomaly of digital signal transmission device

Info

Publication number
JPS5651143A
JPS5651143A JP12680879A JP12680879A JPS5651143A JP S5651143 A JPS5651143 A JP S5651143A JP 12680879 A JP12680879 A JP 12680879A JP 12680879 A JP12680879 A JP 12680879A JP S5651143 A JPS5651143 A JP S5651143A
Authority
JP
Japan
Prior art keywords
output
pulse
shot multivibrator
gate
abnormal state
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
JP12680879A
Other languages
Japanese (ja)
Other versions
JPS5811784B2 (en
Inventor
Sadao Mizokawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP54126808A priority Critical patent/JPS5811784B2/en
Publication of JPS5651143A publication Critical patent/JPS5651143A/en
Publication of JPS5811784B2 publication Critical patent/JPS5811784B2/en
Expired 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)
  • Small-Scale Networks (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To detect rapidly and stably the abnormal state of the line to inhibit the use of demodulation data reproducing clocks caused by the no-signal state, by detecting as anomaly that at least one of the pulse width of a pulse train the pulse interval becomes a prescribed value or more. CONSTITUTION:The output of differentiating circuit 26 is input to one shot multivibrator 40 to monitor the time width and the pulse interval or output pulses of receiving circuit 20. When the pulse wodth or the interval becomes a prescribed value or more, OR between the output of gate 38 and the output of one shot multivibrator 40 is operated, and flip-flop 47 is reset, and READY signal 9k is placed to the unestablishment side. In this case, the abnormal state is output. For release of the abnormal state, the logic between the output of one shot multivibrator 46 and the output of gate 43 is operated after output of gate 43, and flip-flop 47 is set to place the READY signal to the establishment side after the fixed time set by one shot multivibrator 46.
JP54126808A 1979-10-03 1979-10-03 Abnormality detection method for digital signal transmission equipment Expired JPS5811784B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54126808A JPS5811784B2 (en) 1979-10-03 1979-10-03 Abnormality detection method for digital signal transmission equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54126808A JPS5811784B2 (en) 1979-10-03 1979-10-03 Abnormality detection method for digital signal transmission equipment

Publications (2)

Publication Number Publication Date
JPS5651143A true JPS5651143A (en) 1981-05-08
JPS5811784B2 JPS5811784B2 (en) 1983-03-04

Family

ID=14944463

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54126808A Expired JPS5811784B2 (en) 1979-10-03 1979-10-03 Abnormality detection method for digital signal transmission equipment

Country Status (1)

Country Link
JP (1) JPS5811784B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58205353A (en) * 1982-05-25 1983-11-30 Sharp Corp Data trnsmitting system
JPS60189156U (en) * 1984-05-24 1985-12-14 松下電工株式会社 repeater panel
JPS63215139A (en) * 1987-03-04 1988-09-07 Nec Corp Detecting system for fault of signal in balanced double-current interchange

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012324A (en) * 1973-06-06 1975-02-07
JPS5057107A (en) * 1973-09-17 1975-05-19

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012324A (en) * 1973-06-06 1975-02-07
JPS5057107A (en) * 1973-09-17 1975-05-19

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58205353A (en) * 1982-05-25 1983-11-30 Sharp Corp Data trnsmitting system
JPS60189156U (en) * 1984-05-24 1985-12-14 松下電工株式会社 repeater panel
JPH0427237Y2 (en) * 1984-05-24 1992-06-30
JPS63215139A (en) * 1987-03-04 1988-09-07 Nec Corp Detecting system for fault of signal in balanced double-current interchange

Also Published As

Publication number Publication date
JPS5811784B2 (en) 1983-03-04

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