JPS56161751A - Synchronizing system for key telephone set - Google Patents

Synchronizing system for key telephone set

Info

Publication number
JPS56161751A
JPS56161751A JP6408180A JP6408180A JPS56161751A JP S56161751 A JPS56161751 A JP S56161751A JP 6408180 A JP6408180 A JP 6408180A JP 6408180 A JP6408180 A JP 6408180A JP S56161751 A JPS56161751 A JP S56161751A
Authority
JP
Japan
Prior art keywords
circuit
synchronizing signal
polarity
data transmission
call
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
JP6408180A
Other languages
Japanese (ja)
Inventor
Takeo Oba
Eiji Morikami
Hirozo Shintani
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP6408180A priority Critical patent/JPS56161751A/en
Publication of JPS56161751A publication Critical patent/JPS56161751A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals

Abstract

PURPOSE:To take the synchronism simply and surely, by taking the synchronism between terminals through the change in the polarity of a DC supply path fed to the terminas with the synchronizing signal from a synchronizing signal generating circuit. CONSTITUTION:The synchronizing signal from a data transmission control circuit 4 of a terminal 100 is fed to a polarity inverting circuit 2 to invert the output of the polarity inverting circuit 2 connecting a power supply 1. The change in the polarity is detected with a polarity detection circuit 7 of another terminal 300 to judge the synchronizing signal, then the timing of data transmission/reception can be arranged by giving this synchronizing signal to a data transmission control circuit 9. The call is separated from the data at a communication separation circuit 10 from a transmission line 200, and the communication is made possible by giving the call to a channel 12 via a DC closing circuit 11.
JP6408180A 1980-05-16 1980-05-16 Synchronizing system for key telephone set Pending JPS56161751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6408180A JPS56161751A (en) 1980-05-16 1980-05-16 Synchronizing system for key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6408180A JPS56161751A (en) 1980-05-16 1980-05-16 Synchronizing system for key telephone set

Publications (1)

Publication Number Publication Date
JPS56161751A true JPS56161751A (en) 1981-12-12

Family

ID=13247773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6408180A Pending JPS56161751A (en) 1980-05-16 1980-05-16 Synchronizing system for key telephone set

Country Status (1)

Country Link
JP (1) JPS56161751A (en)

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