JPS556928A - Extension answer connecting system for key telephone system - Google Patents

Extension answer connecting system for key telephone system

Info

Publication number
JPS556928A
JPS556928A JP7928078A JP7928078A JPS556928A JP S556928 A JPS556928 A JP S556928A JP 7928078 A JP7928078 A JP 7928078A JP 7928078 A JP7928078 A JP 7928078A JP S556928 A JPS556928 A JP S556928A
Authority
JP
Japan
Prior art keywords
extension
calling
wire
answering
pln
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.)
Granted
Application number
JP7928078A
Other languages
Japanese (ja)
Other versions
JPS5839436B2 (en
Inventor
Koji Oishi
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 JP7928078A priority Critical patent/JPS5839436B2/en
Publication of JPS556928A publication Critical patent/JPS556928A/en
Publication of JPS5839436B2 publication Critical patent/JPS5839436B2/en
Expired 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 decrease the number of the core for the wiring cable by using one piece of extension call wire for both calling and answering use through an automatic switching in the hand-free answering connection system at the extension answering time. CONSTITUTION:The power input of transmission amplifier T-AMP provided within each telephone set is supplied from extension calling wire PL, and the aural output given from amplifier T-AMP is sent back via extension calling wires PL1- PLn. In this connection, extension calling detection relays K1-Kn are provided in accordance with wires PL1-PLn and then connected to hybrid circuit HYB via contacts k1-kn in such way that contact k1 may be installed between wire PL2 and circuit HYB.
JP7928078A 1978-06-30 1978-06-30 Extension response connection method in button telephone equipment Expired JPS5839436B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7928078A JPS5839436B2 (en) 1978-06-30 1978-06-30 Extension response connection method in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7928078A JPS5839436B2 (en) 1978-06-30 1978-06-30 Extension response connection method in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS556928A true JPS556928A (en) 1980-01-18
JPS5839436B2 JPS5839436B2 (en) 1983-08-30

Family

ID=13685447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7928078A Expired JPS5839436B2 (en) 1978-06-30 1978-06-30 Extension response connection method in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5839436B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61174859A (en) * 1985-01-30 1986-08-06 Aihon Kk Interphone telephone hybrid device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896438U (en) * 1981-12-21 1983-06-30 株式会社東芝 heat exchange ventilation fan
JPS6425651U (en) * 1987-08-06 1989-02-13
JP6243682B2 (en) 2013-09-25 2017-12-06 住友ゴム工業株式会社 Medical rubber parts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61174859A (en) * 1985-01-30 1986-08-06 Aihon Kk Interphone telephone hybrid device

Also Published As

Publication number Publication date
JPS5839436B2 (en) 1983-08-30

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