JPS5624856A - Extension call detecting system for key telephone system - Google Patents

Extension call detecting system for key telephone system

Info

Publication number
JPS5624856A
JPS5624856A JP9987279A JP9987279A JPS5624856A JP S5624856 A JPS5624856 A JP S5624856A JP 9987279 A JP9987279 A JP 9987279A JP 9987279 A JP9987279 A JP 9987279A JP S5624856 A JPS5624856 A JP S5624856A
Authority
JP
Japan
Prior art keywords
lines
key telephone
extension call
telephone system
office
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
JP9987279A
Other languages
Japanese (ja)
Other versions
JPS6019877B2 (en
Inventor
Masato Araki
Norio Saneyoshi
Akio Doi
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 JP54099872A priority Critical patent/JPS6019877B2/en
Publication of JPS5624856A publication Critical patent/JPS5624856A/en
Publication of JPS6019877B2 publication Critical patent/JPS6019877B2/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)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To ensure both the office call and the extension call independently from each other with the minimum number of insulated conductors for the key telephone system of the branch connection system, by forming the connecting cord for the office n circuit with 2n+2 pieces of insulated conductors. CONSTITUTION:The branch connection is given between extension call lines 42-1 and 42-2 which are used in common for the power supply to slave units 20 and 30 plus office call line 41 in main device 1 and each of slave units 20 and 30. In such key telephone system, signal generator 7 which secures the piling of the high frequency signal on lines 42-1 and 42-2 is provided to main device 1. And element C20 showing a low impedance to the high frequency signal is connected to lines 42-1 and 42-2 each. Then the calling to lines 42-1 and 42-2 is detected via monitor circuit 8.
JP54099872A 1979-08-07 1979-08-07 Extension call detection method for button telephone equipment Expired JPS6019877B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54099872A JPS6019877B2 (en) 1979-08-07 1979-08-07 Extension call detection method for button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54099872A JPS6019877B2 (en) 1979-08-07 1979-08-07 Extension call detection method for button telephone equipment

Publications (2)

Publication Number Publication Date
JPS5624856A true JPS5624856A (en) 1981-03-10
JPS6019877B2 JPS6019877B2 (en) 1985-05-18

Family

ID=14258891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54099872A Expired JPS6019877B2 (en) 1979-08-07 1979-08-07 Extension call detection method for button telephone equipment

Country Status (1)

Country Link
JP (1) JPS6019877B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856597A (en) * 1981-09-11 1983-04-04 ミテル・コーポレーション Service circuit in telephone system
JPS6320099A (en) * 1986-07-10 1988-01-27 Jgc Corp Treatment of molten slag of waste water sludge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856597A (en) * 1981-09-11 1983-04-04 ミテル・コーポレーション Service circuit in telephone system
JPH0439838B2 (en) * 1981-09-11 1992-06-30
JPS6320099A (en) * 1986-07-10 1988-01-27 Jgc Corp Treatment of molten slag of waste water sludge

Also Published As

Publication number Publication date
JPS6019877B2 (en) 1985-05-18

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