JPS561688A - Control system for key telephone equipment - Google Patents

Control system for key telephone equipment

Info

Publication number
JPS561688A
JPS561688A JP7668879A JP7668879A JPS561688A JP S561688 A JPS561688 A JP S561688A JP 7668879 A JP7668879 A JP 7668879A JP 7668879 A JP7668879 A JP 7668879A JP S561688 A JPS561688 A JP S561688A
Authority
JP
Japan
Prior art keywords
circuits
master unit
current
given
units
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
JP7668879A
Other languages
Japanese (ja)
Other versions
JPS5950154B2 (en
Inventor
Akio Doi
Masato Araki
Norio Saneyoshi
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 JP7668879A priority Critical patent/JPS5950154B2/en
Publication of JPS561688A publication Critical patent/JPS561688A/en
Publication of JPS5950154B2 publication Critical patent/JPS5950154B2/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 simplify the control system as well as decrease the core number of the wiring cable, by detecting the set value of the channel current given from each slave unit via the master unit of the key telephone equipment and then giving the identification to the button selection, the holding and the dial information each. CONSTITUTION:The master unit is connected to slave units #1-#3 via power lines +P and -G, call line T and information line J each. And the DC-type isolation is given between the call current system and main wires 1 and 2, and the value of the call current is compared with the reference value via units #-1#3 to be sent to the master unit in the form of the several prescribed current region levels. And these region levels are idenfified via slave unit detecting circuits 8-1-8-3 of the master unit. In case this current exists, circuits 8-1-8-3 are cut off from the channel via incoming tone sending circuit 12. At the same time, the channels are formed by cross-point circuits 6-1, 6-2 and 7 incorporating SCR and via the outputs of circuit 8-1-8-3 between main wires 1 and 2 or the extension and units #1-#3. And the control is given to the button selection, the holding and the dial information after formation of the channels through main wire control circuits 4-1 and 4-2 plus extension control circuit 5 each.
JP7668879A 1979-06-20 1979-06-20 Control method for button telephone equipment Expired JPS5950154B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7668879A JPS5950154B2 (en) 1979-06-20 1979-06-20 Control method for button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7668879A JPS5950154B2 (en) 1979-06-20 1979-06-20 Control method for button telephone equipment

Publications (2)

Publication Number Publication Date
JPS561688A true JPS561688A (en) 1981-01-09
JPS5950154B2 JPS5950154B2 (en) 1984-12-06

Family

ID=13612388

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7668879A Expired JPS5950154B2 (en) 1979-06-20 1979-06-20 Control method for button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5950154B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60244140A (en) * 1984-05-18 1985-12-04 Tamura Electric Works Ltd Function telephone set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60244140A (en) * 1984-05-18 1985-12-04 Tamura Electric Works Ltd Function telephone set

Also Published As

Publication number Publication date
JPS5950154B2 (en) 1984-12-06

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