Hdmi type a to type a v1 4 cable 1m long oxygen free gold plated contacts hdmi v1 4 specifications hdmi ethernet channel adds high speed networking to an hdmi link allowing users to take full advantage of their ip enabled devices without a separate ethernet cable audio return channel allows an hdmi connected tv with a built in tuner to send audio data upstream to a surround audio system eliminating the need for a separate audio cable3d over hdmidefines inputoutput protocols for major 3