I’ve seen a lot of confusion over MoCA and DECA in various forums recently, so I thought it was worth addressing. Mostly people saying that DirecTV uses ‘DECA’ and not MoCA, and they’re not compatible. This is both correct and incorrect.
MoCA is a standard for networking over coaxial cables in the home, set by the Multimedia over Coaxial Alliance. The standard takes its name from the group, like ATSC. For purposes of this post, MoCA is a standard.
DECA is DirecTV Ethernet-to-Coaxial Adapter. It is a piece of hardware. Not a standard.
So what is it hardware for? Simple – MoCA. Yes, DirecTV uses MoCA. The DECA is just the adapter needed to connect an DirecTV receivers Cat5 Ethernet port to the MoCA coaxial network.
Great, so if DirecTV uses MoCA and cable uses MoCA, it’s all good, right? Not quite. The MoCA Blog explained things well a year ago:
MoCA has specified 2 frequency bands at which the network can be operated: High-RF MoCA for Cable MSOs and Verizon FiOS from 850-1500 MHz, and Mid-RF MoCA for DirecTV from 500-850 MHz. Our more advanced readers may recognize that cable TV broadcasts below 850 MHz on the coax and satellite TV broadcasts above 950 MHz, hence the need for MoCA to avoid interfering with current signals on the line and 2 separate RF bands. Both versions of MoCA are being deployed primarily to enable the Multi-Room DVR feature available from all the major Pay TV providers.
So yes, it is all MoCA, but it is MoCA using two different frequency bands. So a DirecTV MoCA network will not interoperate with a a cable MoCA network. And you can run them over the same coax – cable MoCA would conflict with DirecTV’s video signal, and DirecTV MoCA would conflict with cable’s video signal. So if you’re running DirecTV over your home coax and you want to connect other devices to your MoCA network, such as a gaming console, you’ll need a DECA for that as well as you need mid-range MoCA.