MCPC Satellites
Analog satellite television and terrestrial analog microwave relay communications rely on subcarriers transmitted with the video carrier on a satellite transponder or microwave channel for the audio channels of a video feed. There are usually at frequencies of 5.8, 6.2, or 6.8 MHz (the video carrier usually resides below 5 MHz on a satellite transponder or microwave relay). Extra subcarriers are sometimes transmitted at around 7 or 8 MHz for extra audio (such as radio stations) or low-to-medium-speed data. This is referred to as multiple channel per carrier (MCPC).
This is now mostly superseded by digital TV (usually DVB-S, DVB-S2 or another MPEG-2-based system), where audio and video data are packaged together (multiplexed) in a single MPEG transport stream.
Read more about this topic: Subcarrier
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