[c-nsp] Speed limitations - RF problem or IP ?

[Paul Stewart]

This might not be a good suggestion but have you thought of knocking down
modulation temporarily to see if anything changes?  I know you're saying SNR
and FEC are fine but it might be worth trying....

Paul


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Miguel
Sent: Thursday, April 03, 2008 7:03 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Speed limitations - RF problem or IP ?

 Hello,

Does anyone know what the best things to do when you have speed problems
with cable modems in different downstream/upstream?

This is the scenario:

uBR 10K with about 17000 customers. Each downstream is configured with
256qam and all upstream have 16qam of modulation.
In some cases the upstreams have a load-balance configuration with 2 or 3
upstream per optical node.

There are no problems of SNR and FEC. All values are regular... And the used
bandwidth are low..

After that, in some upstream can not go to the 20Mb of download Bandwidth
and with the configuration used, should arrive without problem to 37Mb...

I tested several cable modems and the problem still remain ...

Someone has suggestions or ways of action to overcome this type of problem?

Thks for your help
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