The Ethernet port on the rear of the CM7500/DVR+ is used for connecting to the internet so that your box can get internet services including software upgrades, enhanced guide data, and online video applications.
Ethernet is the preferred method to connect to your router. If you do not have Ethernet available where your DVR+ is located, then you can connect it to the internet with a WIFI adaptor.
Product # CM-7500XWF.
CM-7500TB1 CM-7500GB16 CM7500GB16 CM7500TB1 CM-7500 CM7500