JPS6436250A - Expanded telephone system - Google Patents
Expanded telephone systemInfo
- Publication number
- JPS6436250A JPS6436250A JP19223487A JP19223487A JPS6436250A JP S6436250 A JPS6436250 A JP S6436250A JP 19223487 A JP19223487 A JP 19223487A JP 19223487 A JP19223487 A JP 19223487A JP S6436250 A JPS6436250 A JP S6436250A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- equipment
- external connection
- incoming
- line
- 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
Abstract
PURPOSE:To attain the connection between a key telephone set and an external connection equipment 3 with a simple constitution by transmitting/receiving a transmission signal, a reception signal and an incoming signal, etc., required for the connection of the external connection equipment through a 4-cored cable for handset connection between the key telephone set and the external connection equipment. CONSTITUTION:The key telephone set 1 and the external connection equipment 3 are connected by the 4-cored cable constituting transmission lines 5, 7, 9, 11. The lines 5, 7 are used for transmitting a transmission signal and a reception signal. An incoming off-hook detection circuit 15 detects an incoming off-hook signal sent from the external connection equipment 3 via the line 5 and gives it to a CPU 21. An outgoing off-hook signal supply circuit 19 sends the outgoing off-hook signal to the external connection equipment 3 via the line 7 in response to the command of the CPU 21. An incoming signal sending circuit 27, in response to the command of the CPU 21, send the incoming signal to the equipment 3 via the line 9. A transformer 23 is connected to the master equipment via a voice signal transmission line 35. A transformer 25 is connected to the master equipment via a data transmission line 37.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19223487A JPS6436250A (en) | 1987-07-31 | 1987-07-31 | Expanded telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19223487A JPS6436250A (en) | 1987-07-31 | 1987-07-31 | Expanded telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6436250A true JPS6436250A (en) | 1989-02-07 |
Family
ID=16287884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19223487A Pending JPS6436250A (en) | 1987-07-31 | 1987-07-31 | Expanded telephone system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6436250A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5732355A (en) * | 1994-04-28 | 1998-03-24 | Uniden America Corporation | Telephone system |
KR100762792B1 (en) * | 2006-04-20 | 2007-10-02 | 주식회사 로템 | Multi channel video transmission system for railcar |
-
1987
- 1987-07-31 JP JP19223487A patent/JPS6436250A/en active Pending
Cited By (3)
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 |
KR100762792B1 (en) * | 2006-04-20 | 2007-10-02 | 주식회사 로템 | Multi channel video transmission system for railcar |
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