JPS6473995A - Key telephone set - Google Patents

Key telephone set

Info

Publication number
JPS6473995A
JPS6473995A JP22979887A JP22979887A JPS6473995A JP S6473995 A JPS6473995 A JP S6473995A JP 22979887 A JP22979887 A JP 22979887A JP 22979887 A JP22979887 A JP 22979887A JP S6473995 A JPS6473995 A JP S6473995A
Authority
JP
Japan
Prior art keywords
key telephone
lines
extension
ping pong
telephone set
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
JP22979887A
Other languages
Japanese (ja)
Inventor
Masayuki Tsurusaki
Shunji Inomata
Hiroshi Mano
Yoshiichi Sano
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP22979887A priority Critical patent/JPS6473995A/en
Publication of JPS6473995A publication Critical patent/JPS6473995A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To extend the extension expanding range longer by using an interface device connecting to a telephone set to a master set by 2 lines and applying ping pong transmission to the communication between the master set and the interface device thereby facilitating the wiring work. CONSTITUTION:The voice data and control between key telephone set interface devices 15, 16 connecting to key telephone sets 11-14 and a master set 1 are transmitted and received by the ping pong transmission system through 2 lines. In extending the extension, the key telephone sets 11-14 and the interface devices 15, 16 are moved together, then only the 2 lines are to be extended. Thus, the wiring work is facilitated and the transmission of 1km or over is attained by the ping pong transmission and longer extension is attained.
JP22979887A 1987-09-16 1987-09-16 Key telephone set Pending JPS6473995A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22979887A JPS6473995A (en) 1987-09-16 1987-09-16 Key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22979887A JPS6473995A (en) 1987-09-16 1987-09-16 Key telephone set

Publications (1)

Publication Number Publication Date
JPS6473995A true JPS6473995A (en) 1989-03-20

Family

ID=16897838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22979887A Pending JPS6473995A (en) 1987-09-16 1987-09-16 Key telephone set

Country Status (1)

Country Link
JP (1) JPS6473995A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251257A (en) * 1990-09-12 1993-10-05 Sharp Kabushiki Kaisha 2-wire/3-wire converting apparatus
US8436465B2 (en) 2007-03-06 2013-05-07 Nikon Corporation Semiconductor device and method for manufacturing the semiconductor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251257A (en) * 1990-09-12 1993-10-05 Sharp Kabushiki Kaisha 2-wire/3-wire converting apparatus
US8436465B2 (en) 2007-03-06 2013-05-07 Nikon Corporation Semiconductor device and method for manufacturing the semiconductor device

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