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

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)

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