It's in the form of an RCA plug, colour coded black, and it's a single plug labelled coaxial. The manual says something about an output for digital sound. I don't know what this is supposed to mean, or what can be connected to it. (When I've looked up coaxial on the web, they all seem to lean towards what I know as the RF plug). This TV has an RF input that the aerial is connected to. Xbox connected to the AV input. Satellite decoder connected to an HDMI input.