JPS553220A - Signal transmission/reception system - Google Patents

Signal transmission/reception system

Info

Publication number
JPS553220A
JPS553220A JP7546578A JP7546578A JPS553220A JP S553220 A JPS553220 A JP S553220A JP 7546578 A JP7546578 A JP 7546578A JP 7546578 A JP7546578 A JP 7546578A JP S553220 A JPS553220 A JP S553220A
Authority
JP
Japan
Prior art keywords
voltage
level
signal transmission
key telephone
signals
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
JP7546578A
Other languages
Japanese (ja)
Other versions
JPS5838997B2 (en
Inventor
Junzo Kikuchi
Hiroshi Kitazono
Masateru Kuroda
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.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works 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 Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP7546578A priority Critical patent/JPS5838997B2/en
Publication of JPS553220A publication Critical patent/JPS553220A/en
Publication of JPS5838997B2 publication Critical patent/JPS5838997B2/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 transmit the signals from the side of the fixed-level voltage to the side of the key telephone for the wire signal transmission between the master unit and the terminal unit like the key telephone and the like, and then to generate the voltage of the original level at the side of the telephone to transmit the signals based on generated voltage. CONSTITUTION:When master unit C is connected to key telephone L1, the voltage of level D is generated by the voltage of level A and via power sending circuit 700 in the interface 5 of the C side and line l1 plus regulator 504 within power receiving circuit 500 in interface 5 of the L1 side, and then held in accumulator 505. Then the clock of the level prescribed based on voltage VD plus the data signals are transmitted from signal transmission circuit 520 under the conditions that the supply of voltage VA is stopped. Thus, the power supply and the signal application are carried out in time division and via the common line, and as a result the number of the lines required for constitution of the system can be decreased.
JP7546578A 1978-06-23 1978-06-23 Signal transmission/reception method Expired JPS5838997B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7546578A JPS5838997B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7546578A JPS5838997B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Publications (2)

Publication Number Publication Date
JPS553220A true JPS553220A (en) 1980-01-11
JPS5838997B2 JPS5838997B2 (en) 1983-08-26

Family

ID=13577073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7546578A Expired JPS5838997B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Country Status (1)

Country Link
JP (1) JPS5838997B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314109A (en) * 1979-06-05 1982-02-02 Iwasaki Tsushinki Kabushiki Kaisha Synchronization system for key telephone system
JPS5825748A (en) * 1981-08-07 1983-02-16 Hitachi Ltd Telephone set

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314109A (en) * 1979-06-05 1982-02-02 Iwasaki Tsushinki Kabushiki Kaisha Synchronization system for key telephone system
JPS5825748A (en) * 1981-08-07 1983-02-16 Hitachi Ltd Telephone set
JPH039668B2 (en) * 1981-08-07 1991-02-08 Hitachi Ltd

Also Published As

Publication number Publication date
JPS5838997B2 (en) 1983-08-26

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