How It Works Connect the Gefen Extender for HDMI 1.3 over CAT5 with Ethernet sender unit to the A/V and Ethernet Source devices such as infrastructure, routers and switches using short HDMI and CAT5 cables. Do the same operation between the Extender receiver and the extended HD Display and any network devices that you are connecting to. When the Extender sender and receiver units have been connected to Sources, Displays and network equipment, connect a single CAT5 extension cable between sender and receiver. The Extender sender and receiver units may be up to 330 feet apart. Note: This product does not support HDCP content when connected to a DVI source or display.