JPH0459665U - - Google Patents
Info
- Publication number
- JPH0459665U JPH0459665U JP10356690U JP10356690U JPH0459665U JP H0459665 U JPH0459665 U JP H0459665U JP 10356690 U JP10356690 U JP 10356690U JP 10356690 U JP10356690 U JP 10356690U JP H0459665 U JPH0459665 U JP H0459665U
- Authority
- JP
- Japan
- Prior art keywords
- current
- loop
- closed loop
- monitoring means
- communication
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims 8
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Monitoring And Testing Of Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10356690U JPH0459665U (en:Method) | 1990-10-01 | 1990-10-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10356690U JPH0459665U (en:Method) | 1990-10-01 | 1990-10-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0459665U true JPH0459665U (en:Method) | 1992-05-21 |
Family
ID=31848496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10356690U Pending JPH0459665U (en:Method) | 1990-10-01 | 1990-10-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0459665U (en:Method) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56117492A (en) * | 1980-02-22 | 1981-09-14 | Hitachi Ltd | Answer monitor circuit |
| JPS62110390A (ja) * | 1985-11-08 | 1987-05-21 | Nec Corp | 電話交換装置の局線回路の直流終端回路 |
| JPS62241493A (ja) * | 1986-03-19 | 1987-10-22 | Iwatsu Electric Co Ltd | ル−プ検出回路 |
-
1990
- 1990-10-01 JP JP10356690U patent/JPH0459665U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56117492A (en) * | 1980-02-22 | 1981-09-14 | Hitachi Ltd | Answer monitor circuit |
| JPS62110390A (ja) * | 1985-11-08 | 1987-05-21 | Nec Corp | 電話交換装置の局線回路の直流終端回路 |
| JPS62241493A (ja) * | 1986-03-19 | 1987-10-22 | Iwatsu Electric Co Ltd | ル−プ検出回路 |