JPS6473851A - Terminal connection identifying system - Google Patents
Terminal connection identifying systemInfo
- Publication number
- JPS6473851A JPS6473851A JP23046587A JP23046587A JPS6473851A JP S6473851 A JPS6473851 A JP S6473851A JP 23046587 A JP23046587 A JP 23046587A JP 23046587 A JP23046587 A JP 23046587A JP S6473851 A JPS6473851 A JP S6473851A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- circuit
- loop
- loop current
- photocoupler
- 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
Landscapes
- Monitoring And Testing Of Exchanges (AREA)
Abstract
PURPOSE:To easily identify the connection state of a terminal, by utilizing a feed path from a network terminal equipment to the terminal, and detecting the loop current of the path by a loop current detecting means. CONSTITUTION:A loop current detecting circuit 215 is inserted in series to the feed path, and is constituted of a photocoupler 216 and an output circuit 217. When the terminal 220 is connected to a custom bus 230, a loop is formed, and the photocoupler 216 is turned (ON), and the output level of the output circuit 217 goes to a (low). Also, when no terminal 220 is connected to the bus, no loop is formed, and the photocoupler 216 is turned (OFF), therefore, the output level of the output circuit 217 goes to a (high). A transmission control circuit 211 can judge the connection state of the terminal 220 corresponding to the output level of the loop current detecting circuit 215, and can inform the state to a station side via a digital subscriber line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23046587A JPS6473851A (en) | 1987-09-14 | 1987-09-14 | Terminal connection identifying system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23046587A JPS6473851A (en) | 1987-09-14 | 1987-09-14 | Terminal connection identifying system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6473851A true JPS6473851A (en) | 1989-03-20 |
Family
ID=16908265
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23046587A Pending JPS6473851A (en) | 1987-09-14 | 1987-09-14 | Terminal connection identifying system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6473851A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8773754B2 (en) | 2000-05-23 | 2014-07-08 | Imra America, Inc. | Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems |
CN112881834A (en) * | 2021-01-18 | 2021-06-01 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Electrical equipment online state detection method and device |
-
1987
- 1987-09-14 JP JP23046587A patent/JPS6473851A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8773754B2 (en) | 2000-05-23 | 2014-07-08 | Imra America, Inc. | Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems |
CN112881834A (en) * | 2021-01-18 | 2021-06-01 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Electrical equipment online state detection method and device |
CN112881834B (en) * | 2021-01-18 | 2022-07-29 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Electrical equipment online state detection method and device |
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