JPS54103626A - Private line multiple transmission device - Google Patents

Private line multiple transmission device

Info

Publication number
JPS54103626A
JPS54103626A JP1085478A JP1085478A JPS54103626A JP S54103626 A JPS54103626 A JP S54103626A JP 1085478 A JP1085478 A JP 1085478A JP 1085478 A JP1085478 A JP 1085478A JP S54103626 A JPS54103626 A JP S54103626A
Authority
JP
Japan
Prior art keywords
disconnection
signal
reference voltage
output
detecting
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
JP1085478A
Other languages
Japanese (ja)
Inventor
Keiichi Mizuguchi
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP1085478A priority Critical patent/JPS54103626A/en
Publication of JPS54103626A publication Critical patent/JPS54103626A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details

Abstract

PURPOSE:To enhance the reliability of the system as a whole by detecting the occurrence of disconnection and its polarity via the output of the differential amplifier which uses the reference voltage for disconnection detection as the double input. CONSTITUTION:The power and the control signal are transmitted to many terminal units 3 from CPU via 2-core private line 2 and by the double-current base band transmission, and the return signal is sent back to CPU from unit 3 in the current mode. Then current detecting resistance R is inserted in series to line 2 to convert the signals on line 2 into the voltage signal. The converted signal is then isolated into the positive and negative side signals through isolator circuit 8, and the disconnection detecting reference voltage of the positive and negative sides are produced by each isolated output in the control period of the steady time other than the communication signal time. Thus, the occurrence and the polarity of the disconnection are detected by the output of differential amplifier 19 and 20 which use the disconnection detecting reference voltage as the double input. As a result, the reliability can be enhanced for the system as a whole.
JP1085478A 1978-01-31 1978-01-31 Private line multiple transmission device Pending JPS54103626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1085478A JPS54103626A (en) 1978-01-31 1978-01-31 Private line multiple transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1085478A JPS54103626A (en) 1978-01-31 1978-01-31 Private line multiple transmission device

Publications (1)

Publication Number Publication Date
JPS54103626A true JPS54103626A (en) 1979-08-15

Family

ID=11761931

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1085478A Pending JPS54103626A (en) 1978-01-31 1978-01-31 Private line multiple transmission device

Country Status (1)

Country Link
JP (1) JPS54103626A (en)

Similar Documents

Publication Publication Date Title
JPS56149148A (en) Signal transmission system
JPS54103626A (en) Private line multiple transmission device
JPS5585156A (en) Protective unit of transmission system
ES384624A1 (en) Two-wire to four-wire conversion circuit for a data switching center
SE7602161L (en) POWER CONTROL SYSTEM
JPS5373019A (en) Signal detection system
JPS5337307A (en) Transmission system for charging signal
JPS5443608A (en) Fault detector for contact signal transmission circuit
JPS55121716A (en) Amplification circuit
JPS5797762A (en) Analogue switch circuit
JPS5443605A (en) Fault detector for contact signal transmission circuit
JPS5437448A (en) Overload detecting circuit of power amplifier
JPS5295111A (en) Signal transmission circuit
JPS56123160A (en) Trunk line channel fault monitoring system
JPS52143708A (en) Signal line test system
JPS5443606A (en) Fault detector for contact signal transmission circuit
JPS5443607A (en) Fault detector for contact signal transmission circuit
JPS57123793A (en) Two-wire signal transmission system
JPS5290049A (en) Earth detection circuit
JPS53105163A (en) Current amplifier circuit
JPS52123118A (en) Digital communication unit completed into duplicated reducdant circuit
JPS52125206A (en) Display control circuit
KR880013316A (en) Signal converter
JPS56117408A (en) Driver circuit
JPS548410A (en) Two-way signal transmitting device