Quote:
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Originally Posted by James Henry
http://www.cableforum.co.uk/board/sh...5&postcount=11
In ntl 'Bromley' network areas this becomes:
8Mhz wide 64QAM downstream, symbol rate 6.592Msym/s @ 6b/sym = 38Mbps payload
8MHz wide 256QAM downstream, symbol rate 6.952Msym/s @ 8b/sym = 51Mbps payload.
This is per downstream, not per uBR, each area can be fed more than one downstream but ntl aren't doing this at this time (Telewest are).
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Langley is the same as the TW specs I assume. I keep forgetting which I am but I think its langley. Has someone got the info for the bromley and langley areas?
Also why dont ntl make their entire network the same although it may cost a fair bit to rip out their langley stuff but having some people on 51mbps and others on 27 clearly is quite a difference some areas will have almost double the bandwidth available which probably explains the massive differences some people have with speeds. But once the network as a whole is all the same platform it ensures less of a postcode lottery so more fairness and no hassle of running 2 different platforms. Its a 2 tier service, customer A in area A might have digital tv services,VOD,10meg zipping along on a 51mpbs ubr and customer B in area B may have analogue tv, 10meg going at 1meg on a 27mbps ubr.