I'm not a RF expert by any means but I'm pretty sure this is how we're
actually doing it on our Arris C3s. We've built 2 main modulation
profiles, one ATDMA and on TDMA and associated them with different
sub-interfaces of the upstreams. The modems train up on the correct
sub-interfaces. This works like a champ for us. I'm assuming that the
uBR has a similar capability.
Justin
Paul Stewart wrote:
Following up...
I'm pretty sure you can run mixed-mode though with QPSK upstream on the 1.x
modems and then 64QAM modulation for Docsis 2.0 modems on the same
upstream/downstreams? This would be ideal even with the 3.2Mhz channel size
until we get a chance to swap out hundreds of cable modems...
Thanks,
-----Original Message-----
From: Michel Renfer [mailto:michel.renfer at finecom.ch]
Sent: Monday, March 05, 2007 10:39 AM
To: cisco-nsp at puck.nether.net
Cc: Paul Stewart
Subject: RE: [c-nsp] Ubr Docsis 2.0 Question
Hi Paul
No, of course not. Your DOCSIS 1.x (TDMA) modems will only support
channel-widths up to 3.2 MHz. If you want use the benefits of a 6.4 MHz
channel-width you need to use DOCSIS 2.0 modems (ATDMA).
cheers,
michel
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
bounces at puck.nether.net] On Behalf Of Paul Stewart
Sent: Monday, March 05, 2007 4:02 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Ubr Docsis 2.0 Question
Hi there...
I'm pretty sure there's some Ubr experts on here ;)
We are migrating a Cisco Ubr7114 up to Ubr7246VXR - so during this
we'll be changing to Docsis 2.0 ... this will also involve changing
the channel bandwidth from 3.2 to 6.4 Mhz....
My question is in regards to Docsis1.1 modems - if we change the
channel size to 6.4 is there a way to support modems that only work
with 3.2 channel width (therefore Docsis 1.x)??
7 messages in net.nether.puck.cisco-nsp[c-nsp] Ubr Docsis 2.0 Question
