JPS55123242A - Circuit control system - Google Patents

Circuit control system

Info

Publication number
JPS55123242A
JPS55123242A JP3143879A JP3143879A JPS55123242A JP S55123242 A JPS55123242 A JP S55123242A JP 3143879 A JP3143879 A JP 3143879A JP 3143879 A JP3143879 A JP 3143879A JP S55123242 A JPS55123242 A JP S55123242A
Authority
JP
Japan
Prior art keywords
circuit
television signal
station
signal
special television
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
JP3143879A
Other languages
Japanese (ja)
Inventor
Takeo Aso
Nobuyoshi Kobayashi
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 JP3143879A priority Critical patent/JPS55123242A/en
Publication of JPS55123242A publication Critical patent/JPS55123242A/en
Pending 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)
  • Details Of Television Systems (AREA)

Abstract

PURPOSE:To make it possible to constitute automatically a special television signal transmitting circuit extending to a receiving terminal station via a repeater station by inserting a special television signal including a circuit supervisory pilot signal into a stand-by circuit and then by detecting the pilot signal at a halfway switching station. CONSTITUTION:Through circuit switching controller 2 of insertion station 1, a special television signal insertion switch 12 is controlled to send a special television signal to intermediate switching station 2 via a stand-by circuit. In switching station 2, special television circuit pilot signal detector 20 equipped to the stand-by circuit detects the television signal being sent and transmits the detection information to circuit switching controller 22. On receiving this detection signal, controller 22 controls special television signal repeating switch 13 and then sends out it to receiving station 3 via the stand-by circuit in the next switching section. In receiving station 3, detector 20 detects the television signal arriving and sends its detection information to controller 22, which controls special television signal receiving terminal switch 14 to output the television signal to the special television signal output terminal.
JP3143879A 1979-03-16 1979-03-16 Circuit control system Pending JPS55123242A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3143879A JPS55123242A (en) 1979-03-16 1979-03-16 Circuit control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3143879A JPS55123242A (en) 1979-03-16 1979-03-16 Circuit control system

Publications (1)

Publication Number Publication Date
JPS55123242A true JPS55123242A (en) 1980-09-22

Family

ID=12331236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3143879A Pending JPS55123242A (en) 1979-03-16 1979-03-16 Circuit control system

Country Status (1)

Country Link
JP (1) JPS55123242A (en)

Similar Documents

Publication Publication Date Title
ES8502556A1 (en) Testable optically isolated control circuit
JPS55123242A (en) Circuit control system
JPS57115051A (en) Telemeter device
ES8608189A1 (en) Testable optically isolated control circuit
JPS56168446A (en) Cordless telephone device
JPS5447415A (en) Sequelch remote control system for radio relay equipment
JPS5723347A (en) Communication system
JPS5720051A (en) Reception switching system of digital radio system
JPS56161742A (en) Automatic detection method for faulty part in loop transmitting system
JPS54124603A (en) Folding connection control system of ring transmitter
JPS64830A (en) Radio relay system
JPS56122253A (en) Signal transmission system
JPS5617529A (en) Transmitting/receiving device
JPS56119570A (en) Emergency communication system
JPS545544A (en) Control system for power line carrier in indoor load
JPS54102805A (en) Fault detection system
JPS54139419A (en) Switching system for double-system transmission line
JPS57202159A (en) Controlling system for transmission interruption
JPS575474A (en) Signal switching device
JPS5761324A (en) Receiver
JPS54161814A (en) Pilot automatic gain control system
JPS56166648A (en) Transmission switching system for television signal
JPS57150244A (en) Connection control system of communication circuit
JPS56149831A (en) Duplex line switching unit
JPS56119557A (en) Communication mode switching system