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Originally Posted by td444
I did realise that raw overheads make that a lower figgure, but NTL do allocate that much to each channel.
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Not entirely sure what you mean by 'channel'. If you mean per upstream as I said there are also 3.2MHz upstreams which have twice the symbol rate and twice the bandwidth capacity. 1.6 and 3.2MHz QPSK are most commonly used, 3.2MHz has stricter RF requirements in that you need to find a 3.2MHz wide band with clean enough signal rather than 3.2, plus you need a bit of buffer in between upstreams this way round.
Next major upgrade is QAM16 upstreams, but these require really good quality RF plant.