The MediaStar 770 rack is a 19-inch 3U enclosure that is used to house any combination of MediaStar ‘blade’ based headend processor modules. The rack can be supplied with either a single ‘pluggable’ mains power supply (770), or a dual redundant ‘hot swap’ power supply (770-DR). There are 9 ‘blade’ positions available in the 770 Rack and 8 ‘blade’ positions in the 770-DR. The 770 rack requires a single 100 to 240V mains source, and the 770-DR requires two mains sources, preferably on independent circuits for redundancy in both racks, the PSU module(s) convert electrical mains input voltage to low voltage DC power that is distributed to each of the ‘blade’ processor modules fitted in the rack. It also provides forced air cooling for the whole 770 rack enclosure.