JPS57132443A - Monitor system for relay transmission line - Google Patents

Monitor system for relay transmission line

Info

Publication number
JPS57132443A
JPS57132443A JP1769281A JP1769281A JPS57132443A JP S57132443 A JPS57132443 A JP S57132443A JP 1769281 A JP1769281 A JP 1769281A JP 1769281 A JP1769281 A JP 1769281A JP S57132443 A JPS57132443 A JP S57132443A
Authority
JP
Japan
Prior art keywords
transmission line
circuits
relay
signal
code
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
JP1769281A
Other languages
Japanese (ja)
Inventor
Masato Shoji
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 JP1769281A priority Critical patent/JPS57132443A/en
Publication of JPS57132443A publication Critical patent/JPS57132443A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/406—Monitoring; Testing of relay systems with selective localization using coded addresses

Landscapes

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

Abstract

PURPOSE:To reduce an output frequency of a failure retrieval current oscillator, by keeping an output signal of a failure retrieval current oscillator in accordance with a specific code assigned at each repeater. CONSTITUTION:Relays 1-3 are inserted to a relay transmission line, and a signal transmitted to a transmission line is amplified and relayed. Failure retrieval current oscillators 4-5 are connected to the input to the relays 1-3 via respectively encoding circuits 7-9. Detection circuits 10-12 are connected to the output of each relay, the circuits 10-12 receive a signal in frequency f1, and discriminates a code from a relay immediately before the signal. When the circuits 10-12 outputs a discriminating signal, the circuits 7-9 are started and the code of itself is transmitted. Thus, a code in frequency f1 is transmitted in the order of a relay at the beginning of a relay transmission line, a terminal station at the reception side selects and receives for discrimination.
JP1769281A 1981-02-09 1981-02-09 Monitor system for relay transmission line Pending JPS57132443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1769281A JPS57132443A (en) 1981-02-09 1981-02-09 Monitor system for relay transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1769281A JPS57132443A (en) 1981-02-09 1981-02-09 Monitor system for relay transmission line

Publications (1)

Publication Number Publication Date
JPS57132443A true JPS57132443A (en) 1982-08-16

Family

ID=11950863

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1769281A Pending JPS57132443A (en) 1981-02-09 1981-02-09 Monitor system for relay transmission line

Country Status (1)

Country Link
JP (1) JPS57132443A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63238746A (en) * 1987-03-26 1988-10-04 Nec Corp Trouble supervising system for transmission line signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63238746A (en) * 1987-03-26 1988-10-04 Nec Corp Trouble supervising system for transmission line signal

Similar Documents

Publication Publication Date Title
GB1389939A (en) Closed loop test method and apparatus for duplex data transmission modem
GB2282020B (en) Relay transmission system including optical amplification
JPS57132443A (en) Monitor system for relay transmission line
JPS5772440A (en) Transmission and receiving system for radio traffic information
JPS56168446A (en) Cordless telephone device
JPS6439845A (en) Data transmission equipment
JPS57116438A (en) Radio communication system
GB1089223A (en) A system for monitoring a radio link
JPS5499506A (en) Repeating monitor system
JPS568957A (en) Facsimile communication system
JPS55121774A (en) Telephone communication system
JPS56103555A (en) Transmission output control system
JPS5652946A (en) Circuit test system of mobile communication
JPS5528615A (en) Data communication system
JPS5780847A (en) Loop data transmission system
JPS54156407A (en) Information communication system
SU1177955A1 (en) Remote control device for operating radio station
SU999176A2 (en) Broadcasting adapting device
JPS6326429B2 (en)
SU944127A1 (en) Repeater
JPS56168450A (en) Fault detecting system of fm radio receiver
JPS5789342A (en) Monitor system
GB1268782A (en) Transmission system
JPS57180274A (en) Television relay system
JPS57178447A (en) Loop data transmission system