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

[Frank Bulk - iNAME]

If it works fine on an unused downstream and upstream port, then wouldn’t
the angle that it’s sharing traffic with others be a reason why 38 Mbps
can’t be achieved on production link?   There’s also all the
timing/contention issues involved in a product link, too.

 

Frank

 

From: mendes.fernando at gmail.com [mailto:mendes.fernando at gmail.com] On Behalf
Of Progressus
Sent: Friday, April 04, 2008 3:51 AM
To: frnkblk at iname.com
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Speed limitations - RF problem or IP ?

 

Yes, I´ve tested this on an unused downstream and upstrean port in the head
end and the download speed is achieved without problem.
 
Apparently there are no factors to unable to pass 20Mb of download  on some
of the optical...
 
Someone has a similar problem?

On Fri, Apr 4, 2008 at 2:58 AM, Frank Bulk - iNAME <frnkblk at iname.com>
wrote:

It will be difficult to attain the ~38 Mbps of downstream if you're shared
with other users....have you tested this on an unused downstream and
upstream port in the head end?

Frank


-----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 6:03 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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