Patent ID: 7679371

Claim:
A cable testing system that tests a cable, the cable testing system comprising: a pulse generation module that transmits a first pulse on a first communications channel of the cable; a sampling module that, after waiting a predetermined time period after said pulse generation module transmits said first pulse, detects a first amplitude of a reflected signal on a second communications channel of the cable; a time domain reflection (TDR) module that receives said first amplitude and that verifies proper operation of the cable based on said first amplitude; a first timer; and a second timer; wherein said predetermined time period corresponds with an estimated roundtrip propagation delay of said first pulse when said first pulse is reflected back to said cable testing system after traveling a first predetermined distance along the cable, wherein said pulse generation module refrains from transmitting said first pulse when said pulse generation module detects activity on at least one of said first and second communications channels, wherein said cable testing system enters a first wait state and resets said first timer when said pulse generation module detects activity on said at least one of said first and second communications channels, wherein, while said cable testing system is in said first wait state, said cable testing system enters a second wait state and resets said second timer when said activity on said at least one of said first and second communications channels subsides, and wherein, while said cable testing system is in said second wait state, said pulse generation module transmits said first pulse when said second timer expires.