JPS555944B2 - - Google Patents
Info
- Publication number
- JPS555944B2 JPS555944B2 JP3088676A JP3088676A JPS555944B2 JP S555944 B2 JPS555944 B2 JP S555944B2 JP 3088676 A JP3088676 A JP 3088676A JP 3088676 A JP3088676 A JP 3088676A JP S555944 B2 JPS555944 B2 JP S555944B2
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
- H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/82—Line monitoring circuits for call progress or status discrimination
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3088676A JPS52115106A (en) | 1976-03-23 | 1976-03-23 | Telephone state detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3088676A JPS52115106A (en) | 1976-03-23 | 1976-03-23 | Telephone state detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52115106A JPS52115106A (en) | 1977-09-27 |
| JPS555944B2 true JPS555944B2 (pl) | 1980-02-12 |
Family
ID=12316201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3088676A Granted JPS52115106A (en) | 1976-03-23 | 1976-03-23 | Telephone state detection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS52115106A (pl) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55109095A (en) * | 1979-02-14 | 1980-08-21 | Nec Corp | Call signal detection system |
| JPS5731256A (en) * | 1980-08-01 | 1982-02-19 | Oki Electric Ind Co Ltd | Ncu circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50100903A (pl) * | 1973-12-28 | 1975-08-11 |
-
1976
- 1976-03-23 JP JP3088676A patent/JPS52115106A/ja active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50100903A (pl) * | 1973-12-28 | 1975-08-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52115106A (en) | 1977-09-27 |