JPS5691566A - Signal transmission system of key telephone set - Google Patents

Signal transmission system of key telephone set

Info

Publication number
JPS5691566A
JPS5691566A JP16994479A JP16994479A JPS5691566A JP S5691566 A JPS5691566 A JP S5691566A JP 16994479 A JP16994479 A JP 16994479A JP 16994479 A JP16994479 A JP 16994479A JP S5691566 A JPS5691566 A JP S5691566A
Authority
JP
Japan
Prior art keywords
signal
various signals
pass filters
signal transmission
cables
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
JP16994479A
Other languages
Japanese (ja)
Other versions
JPS6322119B2 (en
Inventor
Koichi Sekiguchi
Hideaki Naganami
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 JP16994479A priority Critical patent/JPS5691566A/en
Publication of JPS5691566A publication Critical patent/JPS5691566A/en
Publication of JPS6322119B2 publication Critical patent/JPS6322119B2/ja
Granted 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)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make it possible to transmit various signals simultaneously by using a couple of cables by superposing and transmitting various signals via a couple of cables and by extracting various signals separately via a filter provided at a reception side. CONSTITUTION:Although a direct current, an AC signal of 30kHz in frequency and another AC signal of 300-3,400Hz are applied to signal transmission line 5 simultaneously, they are separated into a DC power source, digital signal and sound signal respectively at each terminal via chock coil 10, smoothing circuits 30 and 54, high-pass filters (or low-pass filters) 27 and 51, and band-pass filters 32 and 56. Only talking circuit 44 of master equipment 2 is connected to main wire 4 and when a subordinate equipment is connected to main wire 4, the main-wire key among keys 69 is pushed.
JP16994479A 1979-12-26 1979-12-26 Signal transmission system of key telephone set Granted JPS5691566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16994479A JPS5691566A (en) 1979-12-26 1979-12-26 Signal transmission system of key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16994479A JPS5691566A (en) 1979-12-26 1979-12-26 Signal transmission system of key telephone set

Publications (2)

Publication Number Publication Date
JPS5691566A true JPS5691566A (en) 1981-07-24
JPS6322119B2 JPS6322119B2 (en) 1988-05-10

Family

ID=15895779

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16994479A Granted JPS5691566A (en) 1979-12-26 1979-12-26 Signal transmission system of key telephone set

Country Status (1)

Country Link
JP (1) JPS5691566A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596693A (en) * 1982-07-02 1984-01-13 Meisei Electric Co Ltd Control signal transmission system in key telephone exchange
JPS59131288A (en) * 1983-01-17 1984-07-28 Iwatsu Electric Co Ltd Receiving stabilizing circuit of key telephone set
JPS60210092A (en) * 1984-03-30 1985-10-22 Fujitsu Ltd Data transmission system in pushbutton telephone set
JPS63283390A (en) * 1987-04-23 1988-11-21 アメリカン　テレフォン　アンド　テレグラフ　カムパニー Telephone equipment
EP0430010A2 (en) * 1989-11-23 1991-06-05 Alcatel N.V. Device for transmitting speech signal, signalling and feed over a single pair of conductors in intercommunicating subsets

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS438975Y1 (en) * 1964-06-16 1968-04-19
JPS4875104A (en) * 1972-01-10 1973-10-09
JPS5250104A (en) * 1975-10-21 1977-04-21 Nec Corp Ordering communication system by amplified call
JPS52130517A (en) * 1976-04-26 1977-11-01 Kokusai Denshin Denwa Co Ltd Complex communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS438975Y1 (en) * 1964-06-16 1968-04-19
JPS4875104A (en) * 1972-01-10 1973-10-09
JPS5250104A (en) * 1975-10-21 1977-04-21 Nec Corp Ordering communication system by amplified call
JPS52130517A (en) * 1976-04-26 1977-11-01 Kokusai Denshin Denwa Co Ltd Complex communication system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596693A (en) * 1982-07-02 1984-01-13 Meisei Electric Co Ltd Control signal transmission system in key telephone exchange
JPS59131288A (en) * 1983-01-17 1984-07-28 Iwatsu Electric Co Ltd Receiving stabilizing circuit of key telephone set
JPS60210092A (en) * 1984-03-30 1985-10-22 Fujitsu Ltd Data transmission system in pushbutton telephone set
JPS63283390A (en) * 1987-04-23 1988-11-21 アメリカン　テレフォン　アンド　テレグラフ　カムパニー Telephone equipment
EP0430010A2 (en) * 1989-11-23 1991-06-05 Alcatel N.V. Device for transmitting speech signal, signalling and feed over a single pair of conductors in intercommunicating subsets

Also Published As

Publication number Publication date
JPS6322119B2 (en) 1988-05-10

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