If one end of the HDMI cable is connected to the TV and the other is loose in the A/V cabinet as it was with our Mobile Suites, it is used (by me, at least) to connect a high definition satellite TV receiver output (DirecTV or, presumably, Dish) to the TV. We have a DirecTV Genie for the main TV and mini-Genie for the bedroom TV that are connected to the TVs via these HDMI cables.
Rusty, Sandy, 2 Shelties (Coby & Callie) & Conner the Campground Cat
2016 Ram 3500 Longhorn Crew Cab 4x4 Dually, 385/900 Cummins, Aisin AS69RC, 4.10 axle, 39,100 GCWR, 30,050 trailer tow, B&W RVK3600
Current: 2014.5 DRV Mobile Suites 38RSSA #6972 - Previous: 2004 MS 36RE3 #1291