JPS5675756A - Button telephone device - Google Patents

Button telephone device

Info

Publication number
JPS5675756A
JPS5675756A JP15266379A JP15266379A JPS5675756A JP S5675756 A JPS5675756 A JP S5675756A JP 15266379 A JP15266379 A JP 15266379A JP 15266379 A JP15266379 A JP 15266379A JP S5675756 A JPS5675756 A JP S5675756A
Authority
JP
Japan
Prior art keywords
button telephone
self
telephone set
call
relay
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
JP15266379A
Other languages
Japanese (ja)
Inventor
Tatsuya Kato
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 JP15266379A priority Critical patent/JPS5675756A/en
Publication of JPS5675756A publication Critical patent/JPS5675756A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To enable to continue a call even if a power failure occurs during call, by using a self-hold type relay for a channel switch. CONSTITUTION:If the power supply for a button telephone set is cut off during call, the power to the operating winding A of a channel connection relay R11 is stopped, but the relay R11 is of self-hold type, then the operation is self-held to keep the connection of the main trunk #1 and the button telephone set TEL#1. The end of call at power failure is made by hook switch or the like of the button telephone set TEL#1 to open the channel loop.
JP15266379A 1979-11-26 1979-11-26 Button telephone device Pending JPS5675756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15266379A JPS5675756A (en) 1979-11-26 1979-11-26 Button telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15266379A JPS5675756A (en) 1979-11-26 1979-11-26 Button telephone device

Publications (1)

Publication Number Publication Date
JPS5675756A true JPS5675756A (en) 1981-06-23

Family

ID=15545357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15266379A Pending JPS5675756A (en) 1979-11-26 1979-11-26 Button telephone device

Country Status (1)

Country Link
JP (1) JPS5675756A (en)

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