JPS5778241A - Monitor system for momentary break - Google Patents

Monitor system for momentary break

Info

Publication number
JPS5778241A
JPS5778241A JP55152978A JP15297880A JPS5778241A JP S5778241 A JPS5778241 A JP S5778241A JP 55152978 A JP55152978 A JP 55152978A JP 15297880 A JP15297880 A JP 15297880A JP S5778241 A JPS5778241 A JP S5778241A
Authority
JP
Japan
Prior art keywords
signal
circuit
momentary break
receiving
turned
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
JP55152978A
Other languages
Japanese (ja)
Other versions
JPS6130781B2 (en
Inventor
Noboru Sonehara
Yoshihiro Jinbo
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55152978A priority Critical patent/JPS5778241A/en
Publication of JPS5778241A publication Critical patent/JPS5778241A/en
Publication of JPS6130781B2 publication Critical patent/JPS6130781B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H04L27/066—Carrier recovery circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Dc Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To facilitate the releading-in operation from a data signal after momentary break to monitor the line fault, by using a data communication device to distinguish the normal end of data transmission and the momentary break from each other. CONSTITUTION:If a momentary break occurs by the fault of a line or the like during the receiving operation, a carrier detection indication signal CDi is turned off. At this time, a pattern detecting circuit 15 tries to detect a pattern signal from receiving data RD of the output of a receiving circuit; and if the pattern signal is detected, the normal end is indicated to a receiving control circuit 14, and the circuit 14 turns off a carrier detection signal CD'. A momentary break occurrence signal CF is held in the turn-off state. Meanwhile, if the circuit 15 does not detect the pattern signal, the occurrence of a momentary break is discriminated, and it is indicated to the circuit 14, and the signal CD' is turned off after a prescribed delay time from the time when the signal CDi is turned off.
JP55152978A 1980-11-01 1980-11-01 Monitor system for momentary break Granted JPS5778241A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55152978A JPS5778241A (en) 1980-11-01 1980-11-01 Monitor system for momentary break

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55152978A JPS5778241A (en) 1980-11-01 1980-11-01 Monitor system for momentary break

Publications (2)

Publication Number Publication Date
JPS5778241A true JPS5778241A (en) 1982-05-15
JPS6130781B2 JPS6130781B2 (en) 1986-07-16

Family

ID=15552282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55152978A Granted JPS5778241A (en) 1980-11-01 1980-11-01 Monitor system for momentary break

Country Status (1)

Country Link
JP (1) JPS5778241A (en)

Also Published As

Publication number Publication date
JPS6130781B2 (en) 1986-07-16

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