JPS5624853A - Lamp control system for key telephone system - Google Patents

Lamp control system for key telephone system

Info

Publication number
JPS5624853A
JPS5624853A JP9986979A JP9986979A JPS5624853A JP S5624853 A JPS5624853 A JP S5624853A JP 9986979 A JP9986979 A JP 9986979A JP 9986979 A JP9986979 A JP 9986979A JP S5624853 A JPS5624853 A JP S5624853A
Authority
JP
Japan
Prior art keywords
office
call
line
key telephone
contact
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
JP9986979A
Other languages
Japanese (ja)
Other versions
JPS5939957B2 (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 JP9986979A priority Critical patent/JPS5939957B2/en
Publication of JPS5624853A publication Critical patent/JPS5624853A/en
Publication of JPS5939957B2 publication Critical patent/JPS5939957B2/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
    • H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment

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. These wires and line are furthermore connected T2 to each other in terms of AC, and 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 to neutral point CH10 of line 41 via the parallel-connection circuit consisting of contact r1 which repeats the make and break during the imcoming of the main wire, contact a2 which is made continuously during the call main wire and contact K1 which repeats the make and break during the holding of the main wire respectively. Then current extracting means CH22 which extracts the DC plus display means LD1 which glows by the extracted DC are provided to each slave unit. Thus the state is displayed for the office incoming, the office call and the office holding each.
JP9986979A 1979-08-07 1979-08-07 Lamp control method in button telephone equipment Expired JPS5939957B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9986979A JPS5939957B2 (en) 1979-08-07 1979-08-07 Lamp control method in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9986979A JPS5939957B2 (en) 1979-08-07 1979-08-07 Lamp control method in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS5624853A true JPS5624853A (en) 1981-03-10
JPS5939957B2 JPS5939957B2 (en) 1984-09-27

Family

ID=14258807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9986979A Expired JPS5939957B2 (en) 1979-08-07 1979-08-07 Lamp control method in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5939957B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59115695A (en) * 1982-12-14 1984-07-04 ミテル・コ−ポレ−シヨン Indicator for telephone set
JPS59104656U (en) * 1982-12-28 1984-07-14 株式会社東芝 Wiring connection structure in button telephone equipment
JPH0271089A (en) * 1987-09-09 1990-03-09 Tokyo Gas Co Ltd Heating method for substance to be heated in heating furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59115695A (en) * 1982-12-14 1984-07-04 ミテル・コ−ポレ−シヨン Indicator for telephone set
JPS59104656U (en) * 1982-12-28 1984-07-14 株式会社東芝 Wiring connection structure in button telephone equipment
JPH0271089A (en) * 1987-09-09 1990-03-09 Tokyo Gas Co Ltd Heating method for substance to be heated in heating furnace

Also Published As

Publication number Publication date
JPS5939957B2 (en) 1984-09-27

Similar Documents

Publication Publication Date Title
TW367635B (en) Improved high frequency electrical connector
JPS5310235A (en) Simple type wire telecommunication unit
JPS5624853A (en) Lamp control system for key telephone system
JPS5624855A (en) Holding detecting system for key telephone system
JPS522113A (en) Telephone current suplying system
JPS5624852A (en) Control system for key telephone system
JPS6416153A (en) Cordless telephone system
FR2426365A1 (en) HYBRID CIRCUIT FOR A TWO-FOUR WIRE AUTOMATICALLY ADJUSTED LINK
JPS5624854A (en) Privacy call control system for key telephone system
JPS5624860A (en) Alarm circuit using key telephone system
ES2163166T3 (en) TELECOMMUNICATION INSTALLATION NOT LINKED TO A NETWORK.
GB1469314A (en) Electrical cable monitoring circuitry
DE3270893D1 (en) Integrated circuit microprocessor-controlled telephone two wire/four wire transmission circuit, and line current safeguard powering
JPS5624856A (en) Extension call detecting system for key telephone system
GB1250958A (en)
JPS54150006A (en) Interphone device
JPS5436548A (en) Sectioning connector of closed switching apparatus
US2828366A (en) Holding circuit for a multi-line telephone system
JPS5624858A (en) Calling control system for key telephone system
JPS561695A (en) Key telephone equipment
JPS561688A (en) Control system for key telephone equipment
JPS54139414A (en) Line lead-in system
GB1265084A (en)
JPS54140807A (en) Circuit test system
Kourliourus et al. Spin fiber link on existing conductors.