JPS54109711A - Circuit alarm generating system - Google Patents
Circuit alarm generating systemInfo
- Publication number
- JPS54109711A JPS54109711A JP1590578A JP1590578A JPS54109711A JP S54109711 A JPS54109711 A JP S54109711A JP 1590578 A JP1590578 A JP 1590578A JP 1590578 A JP1590578 A JP 1590578A JP S54109711 A JPS54109711 A JP S54109711A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- amplifier
- monitor signal
- circuit monitor
- 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)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
PURPOSE: To ensure the steady circuit monitoring even though the circuit monitor signal is cut off temporarily by sending the circuit monitor signal extracted through the reception amplifier back to the transmission amplifier via the up-circuit.
CONSTITUTION: The circuit monitor signal generated from circuit monitor signal generator 5 is piled on the normal signal at the transmission terminal and then led to the repeating transmission via converter 1. At the repeating transmission line, the circuit monitor signal is extracted through transmission amplifier 2 to be used as the S signal. At the same time, the circuit monitor signal is extracted also through reception amplifier 2 and then sent back to amplifier 2 to be used as signal S'. At amplifier 2, signal S and S' are collated through comparison comparator 7, and the circuit alarm is given only in case signal S exists normally and signal S' is cut off.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1590578A JPS54109711A (en) | 1978-02-16 | 1978-02-16 | Circuit alarm generating system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1590578A JPS54109711A (en) | 1978-02-16 | 1978-02-16 | Circuit alarm generating system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54109711A true JPS54109711A (en) | 1979-08-28 |
Family
ID=11901780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1590578A Pending JPS54109711A (en) | 1978-02-16 | 1978-02-16 | Circuit alarm generating system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54109711A (en) |
-
1978
- 1978-02-16 JP JP1590578A patent/JPS54109711A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS54109711A (en) | Circuit alarm generating system | |
JPS5314513A (en) | Interface conversion device | |
JPS5421146A (en) | Failure detector | |
JPS5221630A (en) | Anti-overcurrent and starting device of dc power transmission system | |
JPS53142143A (en) | Fault notifying system for input/output device | |
JPS52141254A (en) | Concentrated system for indicating abnormal of automatic equipments group | |
JPS52152051A (en) | Elevator signal transmitting device | |
JPS5394104A (en) | Circuit monitor system | |
JPS53111444A (en) | Converter for dc transmission system | |
JPS53138640A (en) | Power source throw-in system | |
JPS52124151A (en) | Protection system for dc transmission system | |
JPS5235598A (en) | Guarding system | |
JPS51132539A (en) | Brake monitor | |
JPS54918A (en) | Facsimile transmission system | |
JPS52106448A (en) | Generator fluctuation suppressor | |
JPS51147125A (en) | Power signal monitor between two devices | |
JPS5374258A (en) | Insulation monitor | |
JPS5534586A (en) | Trouble detecting system in two-ways data communication system | |
JPS53126833A (en) | Terminal control system | |
JPS54129812A (en) | Line monitor system | |
JPS5336426A (en) | Photoelectric converter device | |
JPS5387615A (en) | Line trouble detection system | |
JPS53107503A (en) | Turbine controller | |
JPS52123197A (en) | Telephone mutual communication system for fire information facility be tween receiver and secondary receiver | |
JPS5365635A (en) | Data transmission system |