Thread: Traffic Shaping
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Old 05-04-2006, 17:09   #201
James Henry
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Re: Traffic Shaping
Quote:
Originally Posted by Rik
Can anyone clarify what the maximum bandwidth a UBR can handle is please?
http://www.cableforum.co.uk/board/sh...5&postcount=11

Quote:
Originally Posted by Ignition
Ah to save a 'how much download speed can be offered' thread all DOCSIS specs are the same on this one so these apply to TW network:

6MHz wide 64QAM downstream, symbol rate 5.057Msym/s @ 6b/sym = 27Mbps payload
6MHz wide 256QAM downstream, symbol rate 5.36Msym/s @ 8b/sym = 38Mbps payload.

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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