Information AboutScpc |
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In an SCPC system, satellite bandwidth is dedicated to a single source. This makes sense if it is being used for something like Satellite Radio , which Broadcast s continuously. But, it doesn't make sense for Burst Transmission s like Satellite Internet access or Telemetry , since a customer would have to pay for the satellite bandwidth even when they were not using it. Some applications use SCPC instead of TDMA , because they require guaranteed, unrestricted bandwidth. As satellite TDMA technology improves however, the applications for SCPC are becoming more limited. Advantages
Disadvantages
MCPC With multiple channels per carrier ('''MCPC'''), several subcarriers are combined into a single bitstream before being modulated onto a carrier transmitted from a single location to one or more remote sites. This uses Time-division Multiplexing (TDM). It is a Retronym of sorts, as it was the only way Radio Network s were transmitted (" Piggyback ed" on Television Network s) until SCPC. In Digital Radio and Digital Television , an Ensemble or other multiplex or multichannel stations can be considered MCPC, though the term is generally only applied to satellites. The major disadvantage of MCPC is that all of the signals must be sent to a single place first, then combined for retransmission — a major reason for using SCPC instead. |
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