JPS6457891A - Key telephone system - Google Patents

Key telephone system

Info

Publication number
JPS6457891A
JPS6457891A JP21306987A JP21306987A JPS6457891A JP S6457891 A JPS6457891 A JP S6457891A JP 21306987 A JP21306987 A JP 21306987A JP 21306987 A JP21306987 A JP 21306987A JP S6457891 A JPS6457891 A JP S6457891A
Authority
JP
Japan
Prior art keywords
trunk line
call
terminals
relay
telephone sets
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
JP21306987A
Other languages
Japanese (ja)
Inventor
Hisao Takeuchi
Yasunobu Nakayama
Hisaaki Kato
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 JP21306987A priority Critical patent/JPS6457891A/en
Publication of JPS6457891A publication Critical patent/JPS6457891A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To attain a one-trunk line and 2-terminal conference by providing a latching relay switching connection on a trunk line and a relay of a single stable relay applying switching connection whether a terminal is to be connected to the trunk line or to the latching relay thereby receiving a call from the trunk line by two telephone sets simultaneously. CONSTITUTION:Terminals 11, 12 (or terminals 12, 11) are ready to out income with respect to the trunk lines 1, 2 independently of the connection state of latching relays 9, 10 at the time of power failure. The relays 13, 14 are subjected to switching control at power application to send a call tone corresponding to the arrival of a call to the trunk line 1 or 2 to the terminals 11, 12 at the same time and the 1-trunk line and 2-terminal equipment conference is formed. Thus, the incoming call from the trunk line is applied by two telephone sets simultaneously at power application and the 1-trunk line and 2-terminal equipment conference is applied by using 2-telephone sets.
JP21306987A 1987-08-28 1987-08-28 Key telephone system Pending JPS6457891A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21306987A JPS6457891A (en) 1987-08-28 1987-08-28 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21306987A JPS6457891A (en) 1987-08-28 1987-08-28 Key telephone system

Publications (1)

Publication Number Publication Date
JPS6457891A true JPS6457891A (en) 1989-03-06

Family

ID=16633023

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21306987A Pending JPS6457891A (en) 1987-08-28 1987-08-28 Key telephone system

Country Status (1)

Country Link
JP (1) JPS6457891A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249013A (en) * 1990-07-23 1993-09-28 Ricoh Company, Ltd. Distance measuring device of camera
CN104176616A (en) * 2013-05-21 2014-12-03 住友重机械工业株式会社 Power supply circuit for lifting magnet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5249013A (en) * 1990-07-23 1993-09-28 Ricoh Company, Ltd. Distance measuring device of camera
CN104176616A (en) * 2013-05-21 2014-12-03 住友重机械工业株式会社 Power supply circuit for lifting magnet

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