The 780C can also be equipped with the optional Auxiliary Channel Analyzer (ACA) utility for monitoring the HDMI or HDBaseT DDC (HDCP and EDID) transactions and hot plug events. The ACA option enables you to monitor the DDC either while emulating an HDMI or HDBaseT source and/or sink or passively monitoring the HDMI DDC, hot plug events and CEC messages between an HDMI source and sink.