MCPC stands for Multiple Channel Per Carrier.
MCPC is a form of satellite transmission where each carrier is utilized to transmit multiple channels.
MCPC transmits multiple video or audio channels on one carrier by utilizing Time Division Multiplexing (TDM).
The alternative to MCPC is SCPC (Single Channel Per Carrier).
MCPC is used much more than SCPC because it makes much more efficient use of expensive satellite bandwidth.