JPS6482794A - Digital key telephone set - Google Patents

Digital key telephone set

Info

Publication number
JPS6482794A
JPS6482794A JP24004187A JP24004187A JPS6482794A JP S6482794 A JPS6482794 A JP S6482794A JP 24004187 A JP24004187 A JP 24004187A JP 24004187 A JP24004187 A JP 24004187A JP S6482794 A JPS6482794 A JP S6482794A
Authority
JP
Japan
Prior art keywords
key telephone
multiplexing
main device
demultiplexing
data
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
JP24004187A
Other languages
Japanese (ja)
Inventor
Kunihiko Wakabayashi
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP24004187A priority Critical patent/JPS6482794A/en
Publication of JPS6482794A publication Critical patent/JPS6482794A/en
Pending legal-status Critical Current

Links

Landscapes

  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To save wiring from a main device to a key telephone set by providing the main device with a control data demultiplexing and multiplexing part and the key telephone set with a data demultiplexing and multiplexing part, and multiplexing and transmitting control data and PCM speech data corresponding to two key telephone sets through one communication path from the main device to the key telephone sets. CONSTITUTION:The main device 1 is equipped with control data demultiplexing and multiplexing part (CDMX) 7 and 8 and a key telephone set T1 is equipped with a data demultiplexing and multiplexing part (DMX) 10. Then when PCM speech data is sent from the main device 1 to the key telephone sets T1 and T2, PCM speech data from a PCM signal demultiplexing/multiplexing and speed conversion part (TDSW) 3 is demultiplexed by a PCM signal demultiplexing/ multiplexing and speed conversion part (PCMCV) 6 into PCM speech data for two key telephone sets T1 and T2 and control data for the two key telephone sets T1 and T2 from a main control part (CTL) 2 are sent by the CDMX 7 through a telephone set interface part control part (IFCL) 5 additionally to the PCM speech data for the two sets. Consequently, the wiring from the main device to the key telephone sets is reduced.
JP24004187A 1987-09-24 1987-09-24 Digital key telephone set Pending JPS6482794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24004187A JPS6482794A (en) 1987-09-24 1987-09-24 Digital key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24004187A JPS6482794A (en) 1987-09-24 1987-09-24 Digital key telephone set

Publications (1)

Publication Number Publication Date
JPS6482794A true JPS6482794A (en) 1989-03-28

Family

ID=17053592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24004187A Pending JPS6482794A (en) 1987-09-24 1987-09-24 Digital key telephone set

Country Status (1)

Country Link
JP (1) JPS6482794A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503412A2 (en) * 1991-03-09 1992-09-16 Neumann Elektronik GmbH Key-controlled multi-line telephone system for alternate, simultaneous or loud-speaking and communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728494A (en) * 1980-07-28 1982-02-16 Oki Electric Ind Co Ltd Private branch of exchange system
JPS5974795A (en) * 1982-10-21 1984-04-27 Taiko Denki Seisakusho:Kk Digital key telephone device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5728494A (en) * 1980-07-28 1982-02-16 Oki Electric Ind Co Ltd Private branch of exchange system
JPS5974795A (en) * 1982-10-21 1984-04-27 Taiko Denki Seisakusho:Kk Digital key telephone device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503412A2 (en) * 1991-03-09 1992-09-16 Neumann Elektronik GmbH Key-controlled multi-line telephone system for alternate, simultaneous or loud-speaking and communication
EP0503412A3 (en) * 1991-03-09 1995-07-19 Fraunhofer Ges Forschung Key-controlled multi-line telephone system for alternate, simultaneous or loud-speaking and communication

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