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Re: NGTV Discussion
Simply put -
Virgin downlink the satellite signals, and pick off the channels they require. Each channel is then sent as a Single Program Transport Stream (SPTS) multicast IP stream onto the IP backbone for distribution. In the regions, the required SPTS streams are multiplexed into Multi Program Transport Streams, encryption and SI/PSI is added, and QAM modulation is used for distribution to the home onto the existing RF network.
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