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join:2004-03-18
UK | reply to netcool
Re: Let's keep all DOCSIS 3.0 Discussion in this thread, please said by netcool :
Many of us work on these issues everyday, as mentioned DOCSIS uses 6.4MHz channel widths. On upstream it can yes, not downstream. Downstream DOCSIS comes in 6MHz and 8MHz flavours.
The RF carrier downstream is the same on DOCSIS 3 as with previous versions, yes it is marginally wider due to raised cosine shaping but the 'wanted' bandwidth of the signal is exactly the same as with previous versions, same symbol rates, same modulations. It is in no way the cause of any incompatibility.
Unsure why you'd be seeing issues due to downstream changes, maybe some incompatibility between certain modems and certain CMTS but that really should not happen on a fully compliant DOCSIS 3 CMTS and DOCSIS CPE.
There are no RF differences between D2 and D3. The differences are in the MAC layer and the ability to bond the channels which are, in D2, discrete. |
