Quote:
Originally Posted by broadbandbug
There is no kit that VM haven't bought that enables Upstream Bonding.. The Cards for Upstream Bonding are not yet available from either Cisco or Motorola.. 2009/2010 as far as I am aware.
The only option in the meantime is more dense modulation schemes (QAM32 or QAM64) and you know how that would perform 
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this lack of
tested upstream bonding "silver" or "Full" D3 seems to be true at the moment, however 2009/2010 seems far to long a commercial availablility timescale given the new push to the new (Euro-)D3 spec worldwide.
while its not really a viable option as far as i can tell,(does anyone have experience of this kit?) they could go for a limited "
Full" D3 Speced "Casa Systems" device or 3 in each headend as a limited trial/test on the "
Full" D3 certified spec, if matched up with one of the "
Full" D3 CPE (probably Ambit on past experience)due out in full production in around 3 months i think....
also,there are several more "waves" to come this year, so there is also a potential to get a silver or even a full '
Cisco or Motorola' card through and into commercial production this year....
http://www.lightreading.com/document...53441&site=cdn
"CableLabs also awarded “full” qualification status for Cable Modem Termination Systems (CMTS) to Casa Systems for two devices. This is the first qualification of a DOCSIS 3.0 CMTS representing “full” or complete compliance with all requirements of the DOCSIS 3.0 specification for headends. Motorola received bronze qualification for its CMTS."
---------- Post added at 19:50 ---------- Previous post was at 19:16 ----------
Quote:
Originally Posted by broadbandbug
Whilst the DoCSIS 3.0 Modems only have the ability to be registered on a single upstream and that upstream can only be 3.2Mhz QAM16 (10Mb/s) then it is very unlikely that 5Mb/s Upstream would be viable (2 simultaneous users bust the upstream). Higher Upstream may come when upstream channel bonding is available (2009/2010).
The other option is to spend shed loads of money to bring the return path up to a higher quality to support QAM32 or QAM64.
---------- Post added at 07:18 ---------- Previous post was at 06:59 ----------
I am interested how some of you feel it possible for VM to offer greater upload speeds on a network that only has 30Mhz return path spectrum in which to work?
To me that breaks down as only having between around 18Mhz and 30Mhz to use, so 4 upstream channels.. 3 x 3.2MHz QAM16 and 1 x 1.6Mhz QPSK shared across around 400 customers
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i was under the impression the No.s your quoting are the average US non Euro
D1.0 No.s
and the majority of kit in VM network was infact Euro
D1.1 kit ? and so has both more freq and speed to play with on average....
and thats not even allowing for the far improved speeds/freq per single channel of the new (Euro-)Docsis2.0B spec that the (Euro-)D3 will be using as its base....
also , i cant find the link i put up on the other thread that showed the recommended "(US)
industry best practice" slides, was to in effect re-seg/shuffle the available total currently used freqs around, so as to allow far for scope in improved larger blocks of freqs to play with later,to get ready for the up and coming D3 rollouts worldwide....and other future options etc.
sure its on a company by company basis, but it seems only wise of VM with its massive UK market share, to have at least
started , or at least got a plan ready for the
recommended re-shuffle of the total used freq plans over the whole VM network.
and thats not even considering the turning off of the old analogue sometime in the future (2010/1012 was it?).