Method for measuring the frequency-dependent attenuation of a telecommunications line, especially a two-wire line

Claim 1

In a method of measuring frequency-dependent attenuation of a telecommunications line, especially a two-wire line in both traffic directions, from one line end, in which method, frequency-dependent attentuation of the line in the direction from the opposite station to the measurement station is determined in a conventional manner at the measurement station at one line end through the corresponding switch-on of remotecontrolled devices in the opposite station at the other end, the improvement comprising the steps of determining the frequencydependent attenuation of a line in the direction from the measurement station to the opposite station (A-B) by transmitting measurement voltages having different respective frequencies from the measurement station to the opposite station, only one frequency being transmitted at any given time; converting the measurement voltages in the opposite station into further voltages; modulating with these further voltages at least one signal to vary a signal characteristic thereof, said at least one signal in each case always having a different frequency than the frequency of the measurement voltage currently transmitted from the measurement station (A), said signal characteristic variation corresponding to the amplitude of the particular measurement voltage received at the opposite station, transmitting the at least one signal modulated by the further voltages via the line to be measured to the measurement station; and deriving from the at least one signal modulated by the further voltages as, received at the measurement station, signals corresponding to the amplitude of the measurement voltages as received at the opposite station, whereby the frequency transmissions characteristic of the line in both directions is determined for a wide band.