Be careful before you purchase any kind of addressable converter. Addressability is typically manufacterer specific. Converter will have to be placed in inventory,channel maps, premium codes,etc. will need to be downloaded to the converter. Check back with Comcast, first to verify that thier DAC is compatable with Magnavox products and second, if they are willing to add to their inventory equipment that does not belong to them. Hope this info helps your cause.