Something else to remember is that as a broadcaster I am only give 19.4Mbps to broadcast my digital signal. If I add multiple streams to my signal, the bandwidth does not go up, I still have to fit it in the 19.4Mbps. If the cable company is not doing anything but receiving and retransmitting my signal, it shouldn't matter if I have 5 multicast channels, it is still only 19.4Mbps.
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Something else to remember is that as a broadcaster I am only give 19.4Mbps to broadcast my digital signal. If I add multiple streams to my signal, the bandwidth does not go up, I still have to fit it in the 19.4Mbps. If the cable company is not doing anything but receiving and retransmitting my signal, it shouldn't matter if I have 5 multicast channels, it is still only 19.4Mbps.