[K12OSN] Network Error Troubles Again ...

[Jim Kronebusch]

If you have a tester that is capable check the length of the run.
Anything over 300ft violates TIA/EIA 568 standards and requires a some
sort of repeater inline to retime and regenerate the signals or you will
have problems.  If possible you may also want test the line for noise, a
run that long will be more sensitive to flourescent lights and
horizontal power runs.

-----Original Message-----
From: k12osn-admin at redhat.com [mailto:k12osn-admin at redhat.com] On Behalf
Of Mark Gumprecht
Sent: Monday, March 08, 2004 10:15 AM
To: k12osn at redhat.com
Subject: Re: [K12OSN] Network Error Troubles Again ...


Over 300 ft will cause all sorts of quirky errors.
My sonic wall would lockup multiple times throughout the day. 
(ie)Shortened the length of cable and I have not had any problems since.
Mark

Jim Christiansen wrote:

> I know I'm shooting in the dark but my school needs some new ideas
> again :-)
>
> My son is doing a Science Fair Project on clustered computers and has
> everything functioning just fine and looks like he may make it to the 
> nationals with his angle using open mosix.
>
> He wanted to run a series of seti jobs on one of my labs that is
> k12ltsp based but using a bunch of knoppix-cluster cds to come up with

> some really impressive numbers (and for the fun of it).
>
> What he discovered was that of 14 network drops, only three
> consistently returned errors:0 dropped:0.  All of the others after 
> running for only a minute or so were ifconfiging errors:25 dropped:150

> or worse.  This is on the exact same machines that work steadily 
> through every school day as k12ltsp clients w-i-t-h one or two random 
> freeze-ups each day.
>
> Our technician has been in the school recently and has added a couple
> new long runs to switches 300 feet away from the main gear in our 
> network.  I don't think that a network tester was used to check the 
> new runs...
>
> Is it possible that these errors be caused by new but faulty distant
> network runs? Or, is this a problem that is more likely local to a bad

> switch the library boxes are hooked to?
>
> Please feel free to bring out the crystal balls for this one!
>
> Jim
>
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-- 
Mark Gumprecht
Data Systems Specialist
MSAD#3
74 School Street
Unity, Maine 04988
207-948-6142
gumprechtm at msln.net



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