JPS5652991A - Inter-call system of key telephone system - Google Patents

Inter-call system of key telephone system

Info

Publication number
JPS5652991A
JPS5652991A JP12804479A JP12804479A JPS5652991A JP S5652991 A JPS5652991 A JP S5652991A JP 12804479 A JP12804479 A JP 12804479A JP 12804479 A JP12804479 A JP 12804479A JP S5652991 A JPS5652991 A JP S5652991A
Authority
JP
Japan
Prior art keywords
telephone set
main unit
signal
operated
adaptor
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
JP12804479A
Other languages
Japanese (ja)
Other versions
JPS6057279B2 (en
Inventor
Katsuyuki Sekine
Tomio Nishimura
Yoshio Shinoda
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 JP12804479A priority Critical patent/JPS6057279B2/en
Publication of JPS5652991A publication Critical patent/JPS5652991A/en
Publication of JPS6057279B2 publication Critical patent/JPS6057279B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To make the individual calling button of each telephone set unnecessary, and to reduce the price of the unit, by transmitting and receiving the information between the main unit and each telephone set, by means of a voltage (discriminating) signal of the control line. CONSTITUTION:A dial pulse of a telephone set, which is sent out to the talking line TL is detected by the main unit adaptor DPO. And the counting circuit COUNT of the inter-call control part in the ME.AP (main unit adaptor) counts the pulses from the adaptor DPO, the switching circuits SW1, SW2... are operated by this output, and the individual signal generating circuits OSC1-OSC3 are operated, respectively. On the other hand, when a signal is sent out from the counting circuit COUNT, the relay RL is operated, the contacts rla, rlb are changed, and the polarity of voltage supplied to the control line CL of the main unit ME is inverted. And signals of the circuits OSC1-OSC3 are input to the telephone set side through the control line CL, the switching circuit SW4 is turned ON by an output from the filter FIL according to the individual signal, and an audible ringing signal is sounded from the speaker.
JP12804479A 1979-10-05 1979-10-05 Individual calling method in button telephone equipment Expired JPS6057279B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12804479A JPS6057279B2 (en) 1979-10-05 1979-10-05 Individual calling method in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12804479A JPS6057279B2 (en) 1979-10-05 1979-10-05 Individual calling method in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS5652991A true JPS5652991A (en) 1981-05-12
JPS6057279B2 JPS6057279B2 (en) 1985-12-13

Family

ID=14975117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12804479A Expired JPS6057279B2 (en) 1979-10-05 1979-10-05 Individual calling method in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS6057279B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6418394A (en) * 1987-07-14 1989-01-23 Sanyo Electric Co Home telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6418394A (en) * 1987-07-14 1989-01-23 Sanyo Electric Co Home telephone system

Also Published As

Publication number Publication date
JPS6057279B2 (en) 1985-12-13

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