If you need to bring video to the remote TV and audio back from that display to the AVR or amp, then our SoloCAT HD MAX kit will resolve your issue over CAT5e/6.

Our device provides HDBT, IR, RS232, 10/100 and audio return path. The audio return capability resides outside of CEC. You can input stereo L/R, S/PDIF or optical in at the receiver then stereo L/R or S/PDIF out at the TX side.

[Link: zektor.com]