JPS647557B2 - - Google Patents
Info
- Publication number
- JPS647557B2 JPS647557B2 JP9270583A JP9270583A JPS647557B2 JP S647557 B2 JPS647557 B2 JP S647557B2 JP 9270583 A JP9270583 A JP 9270583A JP 9270583 A JP9270583 A JP 9270583A JP S647557 B2 JPS647557 B2 JP S647557B2
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- current
- supply line
- current supply
- detection circuit
- 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 23
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000007257 malfunction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000004397 blinking Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/003—Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9270583A JPS59218088A (ja) | 1983-05-26 | 1983-05-26 | 電子式ボタン電話装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9270583A JPS59218088A (ja) | 1983-05-26 | 1983-05-26 | 電子式ボタン電話装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59218088A JPS59218088A (ja) | 1984-12-08 |
| JPS647557B2 true JPS647557B2 (enrdf_load_stackoverflow) | 1989-02-09 |
Family
ID=14061896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9270583A Granted JPS59218088A (ja) | 1983-05-26 | 1983-05-26 | 電子式ボタン電話装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59218088A (enrdf_load_stackoverflow) |
-
1983
- 1983-05-26 JP JP9270583A patent/JPS59218088A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59218088A (ja) | 1984-12-08 |