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Originally Posted by matt2056
You are right in the aspect of tv channels!!!!! WE also carry our broadband down to... The Qam used is only 64 but we can use 256 aslwell which they ain't currently. Plus we use 8mhz on TV and Broadband not 6!!!! we can send both down at the same time... The equip isn't running fully yet and they prop won't untill the demand is there...
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Telewest's standard upgrade procedure is to use 256QAM rather than resegmentation. Telewest have been using 256QAM since the first half of last year as an upgrade scheme.
You can't send TV and broadband down a single 6 or 8MHz band at the same time, you can only send a single RF wave at a time and MCNS requires a dedicated channel.
This DOCSDIAG report from a Telewest uBR:
Channel Freq Max Usage Users Min Ave Max
MHz kbps kbps ms ms ms
Dnstr 0 331.00 30342 12170 307 15 42 469
Dnstr 1 331.00 30342 18265 220 15 45 484
Dnstr 2 331.00 30342 14341 218 15 43 469
Dnstr 3 331.00 30342 16422 305 15 40 422
Indicates that DOCSIS is being used, 30342kbps being the gross throughput of a single 6MHz 64QAM DOCSIS channel before RS error correction overheads - 5.056941 Msymbols/second @ 6 bits per symbol.
Eurodocsis supplies 41.712Mbit/s pre-RS on a single 8MHz 64QAM channel, 6.952Msymbols/second @ 6 bits/symbol.