Cisco cable modem cards, together with IF-to-RF upconverters, serve as the radio frequency (RF) interface between the cable headend and Data Over Cable Service Interface Specifications (DOCSIS)-compliant cable modems or EuroDOCSIS-compliant cable modems and set-top boxes (STBs). Cisco cable modem cards separate downstream output and upstream input cable interfaces on the Cisco uBR7200 series universal broadband router to enable downstream and upstream signal combining and splitting arrangements.