JPS55123250A - Modulation fault supervisory system - Google Patents

Modulation fault supervisory system

Info

Publication number
JPS55123250A
JPS55123250A JP3066579A JP3066579A JPS55123250A JP S55123250 A JPS55123250 A JP S55123250A JP 3066579 A JP3066579 A JP 3066579A JP 3066579 A JP3066579 A JP 3066579A JP S55123250 A JPS55123250 A JP S55123250A
Authority
JP
Japan
Prior art keywords
circuit
modulator
opposite station
station
opposite
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
JP3066579A
Other languages
Japanese (ja)
Other versions
JPS637056B2 (en
Inventor
Yasushi Ichikawa
Masashi Tanaka
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 JP3066579A priority Critical patent/JPS55123250A/en
Publication of JPS55123250A publication Critical patent/JPS55123250A/en
Publication of JPS637056B2 publication Critical patent/JPS637056B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To simplify a transmission change-over circuit by switching the transmitter of the opposite station in case that when a reception input arrives, plural receivers, receiving transmitted signals from the opposite stations, all detect the break of pilot signals. CONSTITUTION:Pilot signal PIL and a reception input detected by way of circuit 11 covering a range from the high frequency wave to the intermediate wave of two reception systems, demodulator 12, pilot filter 15, amplifier 14, and detector 13 are supervised by logic circuit 17. When an input signal arrives and all receivers detect the break of PIL, circuit 17 judges that the opposite station modulator is in trouble, and then sends a control signal to tone oscillator 18. Switching signals from oscillator 18 are sent out to the opposite station by way of modulator 2 and transmission part 3 that the station owns. In the opposite station, switching signals demodulated by demodulator 12 are detected by detection circuit 19 and then supervised by logic circuit 20. When circuit 20 judges that the modulator is getting out of order, switch 9 switches the transmitter.
JP3066579A 1979-03-16 1979-03-16 Modulation fault supervisory system Granted JPS55123250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3066579A JPS55123250A (en) 1979-03-16 1979-03-16 Modulation fault supervisory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3066579A JPS55123250A (en) 1979-03-16 1979-03-16 Modulation fault supervisory system

Publications (2)

Publication Number Publication Date
JPS55123250A true JPS55123250A (en) 1980-09-22
JPS637056B2 JPS637056B2 (en) 1988-02-15

Family

ID=12310027

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3066579A Granted JPS55123250A (en) 1979-03-16 1979-03-16 Modulation fault supervisory system

Country Status (1)

Country Link
JP (1) JPS55123250A (en)

Also Published As

Publication number Publication date
JPS637056B2 (en) 1988-02-15

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