[54639] in North American Network Operators' Group
Re: fast ethernet limits
daemon@ATHENA.MIT.EDU (Douglas A. Dever)
Fri Jan 10 16:02:01 2003
Date: Fri, 10 Jan 2003 16:01:23 -0500
From: "Douglas A. Dever" <doug@e-xpedient.com>
To: Steve Rude <steve@rudedogg.com>
Cc: nanog@merit.edu
Reply-To: doug@e-xpedient.com
In-Reply-To: <Pine.LNX.4.33.0301101156150.11598-100000@lamb.coreis.net>; from steve@rudedogg.com on Fri, Jan 10, 2003 at 12:01:00PM -0800
Errors-To: owner-nanog-outgoing@merit.edu
Previously, Steve Rude (steve@rudedogg.com) wrote:
>
> Hi NANOG,
>
> Could someone please help me with a fast ethernet problem I am having. We
> have a POP in a 27 floor building, and have a rj45 run from the the bottom
> of the building (in the telco room) to the top of the building. We have
> cisco switches on either end and we are seeing about 5-20% packet loss on
> the trunk.
>
> Are we running into a distance limitation of fast ethernet, or are we suffering
> from another problem? I read that 328 feet is the limitation of fast
> ethernet. Is there anything short of getting a repeater for the cable run
> that I can do to boost the signal?
Well, when I don't have drawings or prints, I usually figure on 12 or 13ft
per floor. So, figure somewhere between 324 and 351 feet from 1st floor
to the ceiling on 27. For a run like this, you probably wanted to use fiber
with media converters on each end. (Assuming you're not running
switches with 100BaseFX ports or a GBIC slot...)
--
Douglas A. Dever doug@e-xpedient.com
216.373.8517 - DID
216.401.5888 - Cell
