JPS5624855A - Holding detecting system for key telephone system - Google Patents

Holding detecting system for key telephone system

Info

Publication number
JPS5624855A
JPS5624855A JP9987179A JP9987179A JPS5624855A JP S5624855 A JPS5624855 A JP S5624855A JP 9987179 A JP9987179 A JP 9987179A JP 9987179 A JP9987179 A JP 9987179A JP S5624855 A JPS5624855 A JP S5624855A
Authority
JP
Japan
Prior art keywords
office
key telephone
holding
telephone system
office call
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
JP9987179A
Other languages
Japanese (ja)
Other versions
JPS6019876B2 (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 JP9987179A priority Critical patent/JPS6019876B2/en
Publication of JPS5624855A publication Critical patent/JPS5624855A/en
Publication of JPS6019876B2 publication Critical patent/JPS6019876B2/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
    • H04M9/006—Exchange line circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (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:Main wires L1 and L2 plus office call line 41 within the key telephone system form a DC loop each and also isolated from each other in terms of DC to be furthermore connected T2 to each other in terms of AC. At the same time, the branch connection is secured between the office call line and each of slave units 20 and 30. In addition, the DC is supplied CH10 to the main device at the neutral point of the office call line. Then holding operation HK1 is carried out only when each slave unit is busy. And the DC is extracted CH21 and CH22 via holding switch means HK1, and then this extracted current is detected to detect the holding via holding detecting means 5.
JP9987179A 1979-08-07 1979-08-07 Hold detection method for button telephone equipment Expired JPS6019876B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9987179A JPS6019876B2 (en) 1979-08-07 1979-08-07 Hold detection method for button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9987179A JPS6019876B2 (en) 1979-08-07 1979-08-07 Hold detection method for button telephone equipment

Publications (2)

Publication Number Publication Date
JPS5624855A true JPS5624855A (en) 1981-03-10
JPS6019876B2 JPS6019876B2 (en) 1985-05-18

Family

ID=14258866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9987179A Expired JPS6019876B2 (en) 1979-08-07 1979-08-07 Hold detection method for button telephone equipment

Country Status (1)

Country Link
JP (1) JPS6019876B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58186668U (en) * 1982-06-07 1983-12-12 日本電信電話株式会社 Additional device for sending hold music
JPS60150397A (en) * 1984-01-18 1985-08-08 Masao Uchiumi Transfer device
JPS6133099A (en) * 1984-07-26 1986-02-15 Matsushita Electric Ind Co Ltd Push phone device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58186668U (en) * 1982-06-07 1983-12-12 日本電信電話株式会社 Additional device for sending hold music
JPH033019Y2 (en) * 1982-06-07 1991-01-25
JPS60150397A (en) * 1984-01-18 1985-08-08 Masao Uchiumi Transfer device
JPS6133099A (en) * 1984-07-26 1986-02-15 Matsushita Electric Ind Co Ltd Push phone device

Also Published As

Publication number Publication date
JPS6019876B2 (en) 1985-05-18

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