| 摘要 |
<p>1. An operation and maintenance system for equipments distributed along a bidirectional digital transmission link using a cable and having an intercommunication system between stations in which equipments are located, this system using in both transmission directions an intercommunication signal of digital service channels coded according to a redundant code with prohibited configuration and added through a modulation to the digital traffic signal, said operation and maintenance system comprising a telemonitoring system with a remote control channel using one direction of the link for the acquisition of operative informations in the stations, and a digital transmission channel of very low speed using the other direction of the link for collecting the operative informations, characterized in that the telemonitoring system is provided twice, one remote control channel in each direction of the link being transmitted by a very low frequency gigue which is superimposed to the rhythm of the intercommunication signals of service channels, and a digital transmission channel of very low frequency being transmitted by breaches of the code law of the intercommunication signals of service channels.</p> |
