Abstract: An analyzer for noise signals which are transmitted by a telephone pair in a telephone cable is connected to a digital transmission equalizer. A delimiting circuits delimits the binary stream generated by the threshold detector into data packets such that each stream is considered to be a unique packet as long as the stream does not comprise a predetermined number of zeros. At predetermined instants, writing is triggered into a random access data memory to store the contents of a schedule data register, of a storage register and of a frame unique word register. The time base also comprises an output connected to an incrementing input of an address counter and to an output connected to the zero reset input of storage register.

Abstract: A remote locating system for remote locating the pairs of regenerative repeaters of a bidirectional data transmission line which is interconnected between a monotoring station and a monitored station. The monitoring station comprises a first low frequency generator which generates a first low frequency signal on the forward line channel which is continuously transmitted in the forward direction from the monitoring station to the monotored station in response to the fault detection on the line and a second low frequency generator which generates a second low frequency signal on the backward line channel which is transmitted in the forward direction after the transmission beginning of the first signal. The second signal is modulated by successive pulses, each of which identifies a regenerative repeater pair.