Why would COX GIGABLAST setup require an AC adapter connected to 1 coaxial jack?

I was not home when the installation occurred, but when I returned, I noticed a plug in my AC outlet that was connected to a nearby coaxial outlet. The gigablast ONT has its on power cord, so I am little confused as to why this is needed in my setup. Especially since the these two items do not seem to be connected in any way. I do not have the panoramic setup at this time. Even if I did, I am unsure this is how it would work unless there is a component in my attic or outsude my home that needs this power supplied to it via coxial. I should also note, that I have DirecTV and not cox television, so if its a coaxial line conditioner, I am not sure what it will be used to condition. Any thoughts?