| 摘要 |
<p>O F T H E D I S C L O S U R E The remote monitoring system remote locates individually the pairs of intermediate amplification circuits in the transmission line between a monitoring station and a monitored station. The monitoring station transmits its remote location signals and other control signals which can be mixed with the data signals normally transmitted over the line. The monitoring station analyzes any faults in the signals transmitted and looped in the line and also carries out remote-control of the gain variation of each amplification circuit without normal transmission of the data signals being interrupted. Signals transmitted from by the monitoring station over the forward channel of the line control four loops of the inputs and outputs ofa remote located pair of amplification circuits and a gain regulating means inserted in the negative feedback loop, or inserted upstream or downstream of each amplification circuit in order to change its gain. The transmission line is of the analog, digital or digital-analog type and is supported by means of a cable, optical fibres, radio links or the like.</p> |
