Headend is the center of the distribution of DTT, satellite, IPTV, OTT, cable TV, where it is the main facilities for the receipt and distribution of signals on a TV distribution system.
It would not rely on a program in order to work. rather, an IPTV dealer interfaces a decoder container for your television that allows you to have the potential to look recordings.
Today's broadcast facilities are like data centres with multiple redundant servers for ingest, playout, distribution and NMS network, and they cannot afford to lose power.