monitoring of transmission routes for digital signals with higher transmission speed

摘要

1. Method for the monitoring of transmission links for digital signals with a higher transmission speed, by means of intermediate stations which are interposed into the transmission link at periodic distances and which contain pulse regenerators, by the monitoring of the identification signals which are emitted from these intermediate stations, characterized in that the identification signals occur in the transmission range of the digital signals and in a frequency range which corresponds to approximately 2 ... 4 %. of the Nyquist frequency of the digital signals, that all the received identification signals in the intermediate stations are separated from the transmission signal, are amplified in a transmission path which is independent of the pulse regeneration for the digital signal, are shaped, and are subsequently attached to the regenerated digital signal from which the components which are being replaced by the identification signals were previously gated out, that in each intermediate station the transmitted digital signals are monitored and when a specific error value is exceeded the identification signal emitted from this intermediate station is modified in a recognizable manner.