JPH044800B2 - - Google Patents
Info
- Publication number
- JPH044800B2 JPH044800B2 JP9442885A JP9442885A JPH044800B2 JP H044800 B2 JPH044800 B2 JP H044800B2 JP 9442885 A JP9442885 A JP 9442885A JP 9442885 A JP9442885 A JP 9442885A JP H044800 B2 JPH044800 B2 JP H044800B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- dial tone
- detection circuit
- trunk
- subscriber
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9442885A JPS61252793A (ja) | 1985-04-30 | 1985-04-30 | 発信音検出回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9442885A JPS61252793A (ja) | 1985-04-30 | 1985-04-30 | 発信音検出回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61252793A JPS61252793A (ja) | 1986-11-10 |
JPH044800B2 true JPH044800B2 (de) | 1992-01-29 |
Family
ID=14109957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9442885A Granted JPS61252793A (ja) | 1985-04-30 | 1985-04-30 | 発信音検出回路 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61252793A (de) |
-
1985
- 1985-04-30 JP JP9442885A patent/JPS61252793A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS61252793A (ja) | 1986-11-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term |