[K12OSN] Re: New amer.com switch troubles

Eric Brown ericbrow at gmail.com
Wed Jan 4 16:59:24 UTC 2006

I would really try a cat6 cable.  They are made for faster speed
because they separate the twisted pairs so that there is less
interference.  You need a really good clean signal between the gigabit
devices in order to get the full gigabit connection.

I ended up purchasing 500ft of cat6 off e-bay to make my own.  This
cost me as much as the 20ft patch cable from most vendors.  You still
use regular RJ-45 ends.

Good Luck,

On 1/4/06, M.Pribik <mpribik at zoznam.sk> wrote:
> ----- Original Message -----
> From: "gKw-X" <gkw-x at shaw.ca>
> To: "Support list for opensource software in schools." <k12osn at redhat.com>
> Sent: Tuesday, January 03, 2006 11:03 PM
> Subject: [K12OSN] Re: New amer.com switch troubles
> > Hello,
> >
> > I emailed recently about this problem and I want to bring it up again. I
> > have a 1gig switch from amer.com and a 1gig intel nic in my server, but
> > for some reason the connection between the server and the switch will
> > not go over 100meg speed...
> >
> > I have tried a couple commands to tell it to re-negotiate, and to tell
> > it to go at 1000meg/full duplex, but it always ends up back at
> > 100meg/full duplex. This is one of the commands I tried:
> >
> > ethtool -s eth0 duplex full speed 1000
> >
> > I have had several people suggest the cabling, I will give that another
> > try, but it's a long drive to go in and I would like to have some other
> > options when I do. What commands should I be running to verify the
> > connection, and to change it? Is there any config anywhere that might
> > tell it to use 100meg only? Or is it guaranteed to be a problem outside
> > of the server?
> >
> > I've heard certain kernels have trouble with 1gig speed. I don't know
> > what version I have, but I downloaded k12ltsp in early August. Someone
> > specifically mentioned that kernel version "2.6.11" and earlier has
> > troubles with GB ethernet? Has anyone else ever had similar troubles or
> > did it just magically work?
> >
> > Also, I am pretty sure the cable is cat5e, and cable from the same spool
> > is used between the swithes, and that connection reports 1000meg speed
> > on the switch, so the cable should be fine, correct? Unless that one
> > cable was badly crimped or by sheer bad luck has a flaw. Someone
> > suggested I need cat6 cable, is this true?
> It can be true. If the the quality of the signal is is not very good, then
> the speed go
> low due to the autonegotiated function between cards and switch.
> Marian.
> PS: Try the short test cable /cca 2m/ !!!
> >
> > Thanks for your input!
> >
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