Receiver for determining length and quality of cable in digital data transmission system, has cable processor which calculates cable length based on amplification factor of variable amplifier

摘要

The receiver includes a variable amplifier (101), an amplification control circuit (108) which determines an amplification factor, and a cable processor (109) which calculates a cable length based on the amplification factor. A filter (104) receives preferably an output signal of the amplifier, a coefficient adjustment arrangement determines filter coefficient, and the cable processor calculates preferably a second cable length which is compared with the first cable.