JPS553221A - Signal transmission/reception system - Google Patents

Signal transmission/reception system

Info

Publication number
JPS553221A
JPS553221A JP7546678A JP7546678A JPS553221A JP S553221 A JPS553221 A JP S553221A JP 7546678 A JP7546678 A JP 7546678A JP 7546678 A JP7546678 A JP 7546678A JP S553221 A JPS553221 A JP S553221A
Authority
JP
Japan
Prior art keywords
level
voltage
signal
master unit
key telephone
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
JP7546678A
Other languages
Japanese (ja)
Other versions
JPS5838998B2 (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 JP7546678A priority Critical patent/JPS5838998B2/en
Publication of JPS553221A publication Critical patent/JPS553221A/en
Publication of JPS5838998B2 publication Critical patent/JPS5838998B2/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 make differ the supply voltage and the signal voltage given from the side of the master unit from the signal voltage level given from the side of the key telephone in case the wire signal transmission/reception is carried out between the master unit and the terminal unit such as the key telephone or the like. CONSTITUTION:When master unit C is connected to key telephone L1, the voltage of level VA is transmitted to power reception circuit 500 of the L1 side via l1 and power transmission circuit 700 in interface 5 of the C side to be used as the reference voltage for supply of the signals from the side of L1 of level VD. At the same time, the voltage of level VC is prepared for the signal supply from the C side. And these three levels are set to differ from one another. The clock signals sent from the C side based on VC and furthermore the data signals are transmitted to be received at signal reception circuit 540 and then to be switched to the communication based on level VD sent from the L1 side. Thus, line l1 is used in common by the time division.
JP7546678A 1978-06-23 1978-06-23 Signal transmission/reception method Expired JPS5838998B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7546678A JPS5838998B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7546678A JPS5838998B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Publications (2)

Publication Number Publication Date
JPS553221A true JPS553221A (en) 1980-01-11
JPS5838998B2 JPS5838998B2 (en) 1983-08-26

Family

ID=13577102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7546678A Expired JPS5838998B2 (en) 1978-06-23 1978-06-23 Signal transmission/reception method

Country Status (1)

Country Link
JP (1) JPS5838998B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940737A (en) * 1982-08-30 1984-03-06 Sanyo Electric Co Ltd Bidirectional transmission circuit
US6864717B2 (en) 2000-03-08 2005-03-08 Nec Corporation Signal transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940737A (en) * 1982-08-30 1984-03-06 Sanyo Electric Co Ltd Bidirectional transmission circuit
US6864717B2 (en) 2000-03-08 2005-03-08 Nec Corporation Signal transmission system

Also Published As

Publication number Publication date
JPS5838998B2 (en) 1983-08-26

Similar Documents

Publication Publication Date Title
JPS54136208A (en) Telephone exchanger
JPS553222A (en) Signal transmission/reception system
JPS5329011A (en) Signal transmitter
JPS5585156A (en) Protective unit of transmission system
JPS56157153A (en) Data repeating device
JPS52149903A (en) Data transmitter
JPS5386502A (en) Control unit for telephone circuit netwoek
JPS5671358A (en) Control system for button telephone
JPS553220A (en) Signal transmission/reception system
JPS5624860A (en) Alarm circuit using key telephone system
JPS5630347A (en) Single-speed digital subscriber's line transmission system
JPS5614747A (en) Switchboard
JPS55145460A (en) Communication terminal unit and its exchange network
JPS55127778A (en) Terminal control unit of catv system
JPS5617562A (en) Sending system of charging pulse
JPS53131706A (en) Automatic telephone exchange system
JPS5537013A (en) Facsimile device
JPS5537644A (en) Input-output circuit of microcomputer
JPS54156407A (en) Information communication system
JPS56119557A (en) Communication mode switching system
JPS548410A (en) Two-way signal transmitting device
JPS5526714A (en) Digital transmission system
JPS54162905A (en) Radiotelephony equipment
JPS53131707A (en) Auotmatic telephone exchange system
JPS5599866A (en) Connection unit for communication line