JPS55109095A - Call signal detection system - Google Patents
Call signal detection systemInfo
- Publication number
- JPS55109095A JPS55109095A JP1667979A JP1667979A JPS55109095A JP S55109095 A JPS55109095 A JP S55109095A JP 1667979 A JP1667979 A JP 1667979A JP 1667979 A JP1667979 A JP 1667979A JP S55109095 A JPS55109095 A JP S55109095A
- Authority
- JP
- Japan
- Prior art keywords
- call signal
- features
- diode
- give
- lines
- 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
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1667979A JPS55109095A (en) | 1979-02-14 | 1979-02-14 | Call signal detection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1667979A JPS55109095A (en) | 1979-02-14 | 1979-02-14 | Call signal detection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55109095A true JPS55109095A (en) | 1980-08-21 |
Family
ID=11922993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1667979A Pending JPS55109095A (en) | 1979-02-14 | 1979-02-14 | Call signal detection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55109095A (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS609356U (ja) * | 1983-06-30 | 1985-01-22 | 株式会社東芝 | 呼出信号検出回路 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52115106A (en) * | 1976-03-23 | 1977-09-27 | Toshiba Corp | Telephone state detection system |
-
1979
- 1979-02-14 JP JP1667979A patent/JPS55109095A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52115106A (en) * | 1976-03-23 | 1977-09-27 | Toshiba Corp | Telephone state detection system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS609356U (ja) * | 1983-06-30 | 1985-01-22 | 株式会社東芝 | 呼出信号検出回路 |
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