I need to know what this is.
I need to know what this is.
They say you can use your own router or modem, but it seems you need it connected for your cable to function. It’s unclear what exactly is required.
Thats not a modem or a router. its a MOCA adapter. Here is some information on what MOCA is and what it does: http://www.mocalliance.org/
Visit the site for details at http://www.mocalliance.org/about/faqs.htm
The setup of your home typically uses coaxial cable, not Ethernet wiring. Check the linked website @Skiiwee29 for complete details.
It's designed for applications such as Coaxial to Ethernet adapters. This allows you to connect your PC to a router in another room, especially if your home lacks Ethernet wiring. Older homes with coaxial cables for cable TV can be used similarly. This adapter serves multiple purposes, and I'm sure it has other uses as well. Hope this clarifies things!