Designed for automatic verification of all TMDS pairs in digital video cabling targeting: DVI/HDMI/SDI with application to legacy technologies. Incorporates concepts from eye diagram testing, bit error rate and time domain reflectivity. Detects signal degradation/failure caused by impedance mismatches, crosstalk and continuity/anti-continuity. Integrated multiplexer for automated selection of any TMDS signal pair for full reference eye diagram characterization testing.