JPS6215999A - 自動交換機の加入者状態検出回路 - Google Patents
自動交換機の加入者状態検出回路Info
- Publication number
- JPS6215999A JPS6215999A JP15418885A JP15418885A JPS6215999A JP S6215999 A JPS6215999 A JP S6215999A JP 15418885 A JP15418885 A JP 15418885A JP 15418885 A JP15418885 A JP 15418885A JP S6215999 A JPS6215999 A JP S6215999A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- voltage
- subscriber
- circuit
- comparator
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 241001315609 Pittosporum crassifolium Species 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15418885A JPS6215999A (ja) | 1985-07-15 | 1985-07-15 | 自動交換機の加入者状態検出回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15418885A JPS6215999A (ja) | 1985-07-15 | 1985-07-15 | 自動交換機の加入者状態検出回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6215999A true JPS6215999A (ja) | 1987-01-24 |
JPH0370958B2 JPH0370958B2 (enrdf_load_stackoverflow) | 1991-11-11 |
Family
ID=15578758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15418885A Granted JPS6215999A (ja) | 1985-07-15 | 1985-07-15 | 自動交換機の加入者状態検出回路 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6215999A (enrdf_load_stackoverflow) |
-
1985
- 1985-07-15 JP JP15418885A patent/JPS6215999A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0370958B2 (enrdf_load_stackoverflow) | 1991-11-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5216704A (en) | Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops | |
US4099032A (en) | Loop current detector | |
US5848149A (en) | Subscriber line interface and power circuit | |
US3912883A (en) | Direct current supervisory system | |
AU627982B2 (en) | A new key telephone interface | |
US4079205A (en) | Automatic number identification device | |
JPS6215999A (ja) | 自動交換機の加入者状態検出回路 | |
JP4034999B2 (ja) | 火災受信機の増設ユニット | |
EP0089355B1 (en) | Detector circuit for communication lines | |
CA1069631A (en) | Method and apparatus for automatically identifying an individual calling party on a multiparty telephone line | |
US4689816A (en) | Three relay C. O. trunk interface | |
JPH0821995B2 (ja) | 積分増幅器用補償回路 | |
US4754472A (en) | Telecommunication systems | |
JP2779856B2 (ja) | 電話端末装置 | |
US4127747A (en) | Voltage boost circuit for telephone systems | |
JPH0734566B2 (ja) | インターホン装置 | |
US4178486A (en) | Ring sensing circuit for use with a service evaluation system | |
JP4237018B2 (ja) | グランドスタート方式およびループスタート方式兼用局線トランク回路、局線トランク回路の制御方法、および局線トランク回路の制御用プログラム | |
JP2958230B2 (ja) | 端末網制御装置 | |
JP2643482B2 (ja) | 端末用網制御装置の給電装置 | |
KR880001873Y1 (ko) | 전화 경보 링수 및 전화 단선 감지회로 | |
JPS6240859A (ja) | 網制御回路 | |
JP3039097B2 (ja) | 端末網制御装置 | |
JPS63258193A (ja) | ボタン電話装置の停電用電話機回路 | |
JPS6269759A (ja) | 電話交換機のオフフツク状態検出回路 |