issues with Intel Pro/1000 and 1000baseTX

Bill Moran wmoran at
Thu May 14 19:33:38 UTC 2009

In response to James Tanis <jtanis at>:

> Bill Moran wrote:
> > Replace the cable.  If the cable is marginal, autoneg will downgrade the
> > speed to ensure reliability.  Use a cable that you know will produce
> > 1000baseTX because you've tested it on other systems.
> >   
> Well, I don't have any verified working cable of the appropriate length 
> so I simply switched out the cables for the main server and the backup 
> server. They are both cat6 cables crimped with cat5e modules by me. For 
> what reason (bad crimp job?) that seemed to fix the issue.

QC on patch cables is sketchy.  Most places are usually good, but
even the best companies will have a bad crimp every now and again.

Add to that how they are generally handled ... I mean, statistically
there's a good chance that cable was on the floor and someone stepped
on it or something ...

Bill Moran

More information about the freebsd-questions mailing list