Basically a headend is server which receive the signal from the dishes then decodes , multiplex , encodes and then transmit it via modulators
A Digital Headend system is a new revolution in cable TV industry. Digital Headend changed the whole phenomenon of cable TV industry by increasing the number of services. A large number of services can be run on a digital headend. Also digital headend system reduces the bandwidth and provide us better pitcher quality. Also digital headend enable us to provide more services rather than channels like Radio Service.