What is a Cox Receiver

In the 'going digital' notice it refers to a 'cox receiver' being necessary. I have two of the 'boxes' but other TV's are connected directly by coaxial cable, which I consider to be a 'cox receiver' because it is from Cox and it does receive their signal. So my question is, Is my cable connection a 'cox receiver' or do I have to get a 'mini box' as mentioned in the notice. Basically, my question is: What is a Cox Receiver? Please provide a definition for this term.