JPS54162908A - Key telephone system - Google Patents

Key telephone system

Info

Publication number
JPS54162908A
JPS54162908A JP7233878A JP7233878A JPS54162908A JP S54162908 A JPS54162908 A JP S54162908A JP 7233878 A JP7233878 A JP 7233878A JP 7233878 A JP7233878 A JP 7233878A JP S54162908 A JPS54162908 A JP S54162908A
Authority
JP
Japan
Prior art keywords
opx12
extension
main wire
telephone
circuit
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.)
Pending
Application number
JP7233878A
Other languages
Japanese (ja)
Inventor
Minoru Yamanaka
Kenji Sunochi
Keitaro Sakurai
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7233878A priority Critical patent/JPS54162908A/en
Publication of JPS54162908A publication Critical patent/JPS54162908A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements

Landscapes

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

Abstract

PURPOSE:To secure the office call even from the office extension telephone set (OPX) added to the key telephone with use of the extension counter circuit. CONSTITUTION:When the connection is desired for the main wire 14 to OPX12 which is an exclusive telephone, OPX12 calls out key telephone 13 via extension 15 to request for the trunk connection. Telephone 13 catches extension circuit 2 after confirming the idle state of the main wire and then gives dialing with addition of the special number to the head of the extension number of the OPX. Extension counter circuit 3 identifies the special number and then starts trunk connection circuit 9 within extension circuit 5 through trunk connection control circuit 4 as well as drives called control circuit 6. Thus, the signals given from bell power source 8 are transmitted to OPX12. With reply of OPX12, OPX12 is connected to main wire 14 via contact 10. Thus OPX12 is ready for transmission of the main wire. In the case of incoming of the main wire, OPX12 can also be connected to the main wire through the same operation of telephone 13.
JP7233878A 1978-06-14 1978-06-14 Key telephone system Pending JPS54162908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7233878A JPS54162908A (en) 1978-06-14 1978-06-14 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7233878A JPS54162908A (en) 1978-06-14 1978-06-14 Key telephone system

Publications (1)

Publication Number Publication Date
JPS54162908A true JPS54162908A (en) 1979-12-25

Family

ID=13486398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7233878A Pending JPS54162908A (en) 1978-06-14 1978-06-14 Key telephone system

Country Status (1)

Country Link
JP (1) JPS54162908A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732355A (en) * 1994-04-28 1998-03-24 Uniden America Corporation Telephone system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732355A (en) * 1994-04-28 1998-03-24 Uniden America Corporation Telephone system
US5758289A (en) * 1994-04-28 1998-05-26 Uniden Corporation Telephone system and bell sound detecting method thereof

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