A flat high definition multimedia interface (HDMI) cable. The flat cable that is less visible in comparison to a round HDMI cable for wall mounted television setup. An HDMI connector is coupled to the flat cable. An active circuit isolates physical characteristics of the HDMI connector. The active circuit causes the flat cable to appear shorter than its actual length during HDMI compliance testing using impedance testing. Moreover, the active circuit causes a consumer electronic control (CEC) line, a display data channel (DDC) line and transition minimized differential signal (TMDS) line to actively terminate for reducing parasitic capacitance from the length of the flat cable during HDMI compliance testing. Thus, the isolation allows the flat cable to satisfy HDMI compliant testing. The flat cable may be selected from a group consisting of ribbon cable, twisted pair cable, flexible printed circuit board, micro coax cable, optical cable and glass fiber cable.