Procedure and device to find automatically the failures in facilities for the multiplexion of telephone channels to frequency division. (Machine-translation by Google Translate, not legally binding)

摘要

Procedure for automatically finding faults in installations for multiplexing telephone channels to frequency division, characterized by the fact that a test signal is generated whose spectrum is included in the phonic field is sent cyclically and for a specific time to each group of a multiplex transmission system of carrier frequencies, said signal is interfered in successively by appropriate time intervals with each of the modulating carrier frequencies of each channel, is extracted by the high-frequency output of the group said signal that is sent at the high-frequency input of the group itself, said test signal is demodulated with the carrier frequencies of the channel and sent, with appropriate amplification, to a reception and control unit which, in the event of lack of reception of the signal test triggers an alarm and provides an indication of the group interval and channel interval in which that the absence of a signal has been verified. (Machine-translation by Google Translate, not legally binding)