JPS5638628A - Change-over unit for signal line - Google Patents

Change-over unit for signal line

Info

Publication number
JPS5638628A
JPS5638628A JP11377779A JP11377779A JPS5638628A JP S5638628 A JPS5638628 A JP S5638628A JP 11377779 A JP11377779 A JP 11377779A JP 11377779 A JP11377779 A JP 11377779A JP S5638628 A JPS5638628 A JP S5638628A
Authority
JP
Japan
Prior art keywords
relay
signal line
change
output signal
signal lines
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
JP11377779A
Other languages
Japanese (ja)
Inventor
Tsutomu Sakurai
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 JP11377779A priority Critical patent/JPS5638628A/en
Publication of JPS5638628A publication Critical patent/JPS5638628A/en
Pending legal-status Critical Current

Links

Classifications

    • Y02B60/1235—

Landscapes

  • Maintenance And Management Of Digital Transmission (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE: To keep the connection of input and output signal line, even if the supply of power is interrupted, by using the relay having the brake contact as the connecting relay in the relay circuit performing connection and disconnection of the input signal line and the output signal line.
CONSTITUTION: The connectio and disconnection between a plurality of input signal lines 16(1)W16(n) and a plurality of output signal lines 17(1)W17(n) are made with the signal change-over section 9 consisting of the relay 10 having the make contact 20 and the relay 11 having the brake contact 21. Further, the NOT circuit 13 is provided in the path of driving current of the relay 11 having the brake contact 21. Power is supplied to the control circuit 2 and the signal line change-over section 9 from the power source 15. If the power supply from the power source 15 is interrupted, all the relay contacts 20 and 21 are at nonoperaion, but the brake contact 21 is closed, allowing to keep the connection between the input signal lines 16(1)W 16(n) and the output signal lines 17(1)W17(n-1) which require the connection state.
COPYRIGHT: (C)1981,JPO&Japio
JP11377779A 1979-09-05 1979-09-05 Change-over unit for signal line Pending JPS5638628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11377779A JPS5638628A (en) 1979-09-05 1979-09-05 Change-over unit for signal line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11377779A JPS5638628A (en) 1979-09-05 1979-09-05 Change-over unit for signal line

Publications (1)

Publication Number Publication Date
JPS5638628A true JPS5638628A (en) 1981-04-13

Family

ID=14620845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11377779A Pending JPS5638628A (en) 1979-09-05 1979-09-05 Change-over unit for signal line

Country Status (1)

Country Link
JP (1) JPS5638628A (en)

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