JPS57201350A - Information transmission system - Google Patents

Information transmission system

Info

Publication number
JPS57201350A
JPS57201350A JP56087273A JP8727381A JPS57201350A JP S57201350 A JPS57201350 A JP S57201350A JP 56087273 A JP56087273 A JP 56087273A JP 8727381 A JP8727381 A JP 8727381A JP S57201350 A JPS57201350 A JP S57201350A
Authority
JP
Japan
Prior art keywords
service interruption
scanner
slave station
receiving device
signal receiving
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
JP56087273A
Other languages
Japanese (ja)
Inventor
Nobuo Tsuyoshi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56087273A priority Critical patent/JPS57201350A/en
Publication of JPS57201350A publication Critical patent/JPS57201350A/en
Pending 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)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To discern service interruption of a slave station in a master station by adding circuits for using a service interruption detection signal receiving device of master station side in common with all slave stations. CONSTITUTION:A scanner 9 is working slways in a master station, and input circuits of a service interruption detection signal receiving device 10 are connected cyclically as No. 1 slave station A No. 2 slave station B No. 1 slave station A.... For instance, if service interruption occurs in the No. 1 slave station, voice frequency of (f2-1) band comes to the scanner 9 for a specified time. When an input circuit of the service interruption signal receiving device 10 is formed by the scanner 9, (f2-1) is received and a slave station number signal from the scanner 9 is added and stored. An alarm is indicated at the same time. When service interruption is restored, a data transmitting device (1-1) operates and a demodulator (5-1) detects (f1-1). This signal is taken into the scanner 9 and memory of service interruption detection in the service interruption signal receiving device is erased.
JP56087273A 1981-06-03 1981-06-03 Information transmission system Pending JPS57201350A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56087273A JPS57201350A (en) 1981-06-03 1981-06-03 Information transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56087273A JPS57201350A (en) 1981-06-03 1981-06-03 Information transmission system

Publications (1)

Publication Number Publication Date
JPS57201350A true JPS57201350A (en) 1982-12-09

Family

ID=13910153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56087273A Pending JPS57201350A (en) 1981-06-03 1981-06-03 Information transmission system

Country Status (1)

Country Link
JP (1) JPS57201350A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60224349A (en) * 1984-04-23 1985-11-08 Oki Electric Ind Co Ltd Detection for power failure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60224349A (en) * 1984-04-23 1985-11-08 Oki Electric Ind Co Ltd Detection for power failure

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