Thread: NTL should switch to a digital only service!
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Old 06-12-2004, 19:33   #15
Tristan
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Re: NTL should switch to a digital only service!
You can't directly compare the (analogue) bandwidth of a digital multiplex across different platforms. For example, DSat and DTT have a lot of error-checking which is not needed on cable. Likewise, DSat used QPSK, and DTT 16QAM for some muxes, whereas DCab uses 64QAM all round -- there is even the possibility of moving to 256QAM in future (this is already used for broadband in some areas).

Basically, cable can get the highest "bitrate per MHz", then terrestrial, then satellite.

For all that though, 15MHz for one channel does seem a hell of a lot...
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