JPS5641037B2 - - Google Patents
Info
- Publication number
- JPS5641037B2 JPS5641037B2 JP5204977A JP5204977A JPS5641037B2 JP S5641037 B2 JPS5641037 B2 JP S5641037B2 JP 5204977 A JP5204977 A JP 5204977A JP 5204977 A JP5204977 A JP 5204977A JP S5641037 B2 JPS5641037 B2 JP S5641037B2
- Authority
- JP
- Japan
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5204977A JPS53138207A (en) | 1977-05-09 | 1977-05-09 | Calling detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5204977A JPS53138207A (en) | 1977-05-09 | 1977-05-09 | Calling detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS53138207A JPS53138207A (en) | 1978-12-02 |
JPS5641037B2 true JPS5641037B2 (en) | 1981-09-25 |
Family
ID=12903949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5204977A Granted JPS53138207A (en) | 1977-05-09 | 1977-05-09 | Calling detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS53138207A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49129408U (en) * | 1973-03-05 | 1974-11-07 | ||
JPS5195709A (en) * | 1975-02-19 | 1976-08-21 | ||
JPS51127605A (en) * | 1975-04-30 | 1976-11-06 | Hitachi Ltd | Call detection system |
-
1977
- 1977-05-09 JP JP5204977A patent/JPS53138207A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49129408U (en) * | 1973-03-05 | 1974-11-07 | ||
JPS5195709A (en) * | 1975-02-19 | 1976-08-21 | ||
JPS51127605A (en) * | 1975-04-30 | 1976-11-06 | Hitachi Ltd | Call detection system |
Also Published As
Publication number | Publication date |
---|---|
JPS53138207A (en) | 1978-12-02 |