JPS57121344A - Transmission system alarm indication signal - Google Patents

Transmission system alarm indication signal

Info

Publication number
JPS57121344A
JPS57121344A JP56007003A JP700381A JPS57121344A JP S57121344 A JPS57121344 A JP S57121344A JP 56007003 A JP56007003 A JP 56007003A JP 700381 A JP700381 A JP 700381A JP S57121344 A JPS57121344 A JP S57121344A
Authority
JP
Japan
Prior art keywords
signal
ais
alarm
circuit
transmitted
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
JP56007003A
Other languages
Japanese (ja)
Other versions
JPS6232664B2 (en
Inventor
Masahiro Nakajima
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 JP56007003A priority Critical patent/JPS57121344A/en
Publication of JPS57121344A publication Critical patent/JPS57121344A/en
Publication of JPS6232664B2 publication Critical patent/JPS6232664B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/23—Indication means, e.g. displays, alarms, audible means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To transmit an AIS (alarm indication) signal through a radio digital transmission line without the influence upon the fault detection method, by transmitting only a radio section by an alarm transfer signal with the logical value changed. CONSTITUTION:When an AIS signal (a) is inputted to a transmission side A, faults of devices in preceding stages are detected by an AIS detecting circuit 7, and the AIS signal (a) and an alarm transmission signal (b) generated by an alarm transmission signal generating circuit 8 are switched by a logic switching circuit 9 under the control of the AIS detection signal, and the alarm transmission signal (b) is transmitted to a radio circuit 2. Meanwhile, in a receiving side B, the transmitted alarm transmission signal (b) is detected by an alarm transmission signal detecting circuit 10, and the transmitted alarm transmission signal and the AIS signal (a) generated by an AIS signal generating circuit 11 are switched by a switching circuit 12 under the control of the output signal from the circuit 10, and the AIS signal (a) is transmitted to a transmission line 5 of the next stage.
JP56007003A 1981-01-20 1981-01-20 Transmission system alarm indication signal Granted JPS57121344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56007003A JPS57121344A (en) 1981-01-20 1981-01-20 Transmission system alarm indication signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56007003A JPS57121344A (en) 1981-01-20 1981-01-20 Transmission system alarm indication signal

Publications (2)

Publication Number Publication Date
JPS57121344A true JPS57121344A (en) 1982-07-28
JPS6232664B2 JPS6232664B2 (en) 1987-07-16

Family

ID=11653895

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56007003A Granted JPS57121344A (en) 1981-01-20 1981-01-20 Transmission system alarm indication signal

Country Status (1)

Country Link
JP (1) JPS57121344A (en)

Also Published As

Publication number Publication date
JPS6232664B2 (en) 1987-07-16

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