JPS5484911A - Protection unit for signal transmission line - Google Patents
Protection unit for signal transmission lineInfo
- Publication number
- JPS5484911A JPS5484911A JP15377277A JP15377277A JPS5484911A JP S5484911 A JPS5484911 A JP S5484911A JP 15377277 A JP15377277 A JP 15377277A JP 15377277 A JP15377277 A JP 15377277A JP S5484911 A JPS5484911 A JP S5484911A
- Authority
- JP
- Japan
- Prior art keywords
- demodulator
- set value
- reception signal
- transmission line
- signal transmission
- 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 Transmission In General (AREA)
Abstract
PURPOSE: To increase the reliability of line, by reducing the detection speed of line open and detecting the repetitive momentary interruption in a short time, through the supervisory before the reception signal level is fed to the filter, in microwave lines.
CONSTITUTION: The reception signal from the transformer 1 is outputted via the filter 2 and demodulator 3, and the line open detector 4 stops the output of the demodulator 3 when the input level is lower than a given value. Further, the reception signal of the transformer 1 is inputted to the continuity momentary open detector 8, detecting the momentary interruption repeated in a short time according to a given time and number of set value. If it is less than the set value, the output signal of the demodulator 3 is in reset condition and if more than the set value, the output signal of the demodulator 3 is stopped.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15377277A JPS5484911A (en) | 1977-12-20 | 1977-12-20 | Protection unit for signal transmission line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15377277A JPS5484911A (en) | 1977-12-20 | 1977-12-20 | Protection unit for signal transmission line |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5484911A true JPS5484911A (en) | 1979-07-06 |
Family
ID=15569791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15377277A Pending JPS5484911A (en) | 1977-12-20 | 1977-12-20 | Protection unit for signal transmission line |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5484911A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4942207A (en) * | 1972-08-16 | 1974-04-20 | ||
JPS5111507A (en) * | 1974-07-19 | 1976-01-29 | Nippon Telegraph & Telephone |
-
1977
- 1977-12-20 JP JP15377277A patent/JPS5484911A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4942207A (en) * | 1972-08-16 | 1974-04-20 | ||
JPS5111507A (en) * | 1974-07-19 | 1976-01-29 | Nippon Telegraph & Telephone |
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