JPS6457891A - Key telephone system - Google Patents
Key telephone systemInfo
- 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
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.
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)
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 |
-
1987
- 1987-08-28 JP JP21306987A patent/JPS6457891A/en active Pending
Cited By (2)
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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