Abstract: A simulator for simulating the attenuation characteristics of a length of coaxial cable in a cable television (CATV) network employs a diplex filter to separate the CATV signal and AC power into at least two separate signal paths. The AC power path has a resistance selected to simulate the DC loop resistance of the desire length of cable. The CATV signal path is in parallel with the AC power path, and has an attenuation selected to simulate the characteristics of the cable at CATV frequencies. In the preferred embodiment, the simulator is equipped with separate signal paths for the upstream and downstream CATV signals that have attenuations selected to simulate the characteristics of the cable within the frequency bands used for upstream and downstream CATV signals, respectively. The resistor in the AC power path has a sufficiently high power rating to handle realistic AC power levels.