[c-nsp] 2651xm packet loss with 200 ft ethernet link

[Pete Lumbis]

Are you terminating to the onboard ethernet port or a WIC? What code
version?



On Fri, Dec 28, 2012 at 2:33 PM, Andy Dills <andy at xecu.net> wrote:

>
> I'm having a weird problem that I can't quite seem to wrap my head around.
>
> I have customer who has a 2651XM that we're hooking up to a Level3
> (copper) ethernet circuit. Because of the distance between our telco
> handoff and his rack, he has about 200 feet. Which shouldn't be a problem.
>
> However, we were seeing tremendous packet loss. After determining the
> errors were coming from this end, and testing and replacing everything in
> the path, we finally tried moving the router into the telco handoff room
> so we could try to eliminate a lot of variables. With a short patch cable,
> it worked fine, no packet loss.
>
> So, we made a 200 ft cable to simulate the issue, and hooked it up to the
> router while it sat next to the Level3 handoff...major packet loss again.
> We tried the other fastethernet interface on the 2651...same problem.
>
> However, if I take that same cable and terminate it into one of our 7200s,
> we get zero packet loss.
>
> In sum:
>
> This 2651xm with long cable, major packet loss
> This 2651xm with short cable, works fine
> Our 7200 with the same long cable, works fine
>
> What's going on here? Is the controller in the 2651xm failing? Perhaps not
> producing enough voltage?
>
> Thanks,
> Andy
>
> ---
> Andy Dills
> Xecunet, Inc.
> www.xecu.net
> 301-682-9972
> ---
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