100 meters is, in fact, the distance limitation for Fast Ethernet, but you
can usually exceed that if the link is full duplex. Note that I'm not
recommending that you do so, just stating that it is possible.
If your run length is more than 100 meters, and you're running half duplex,
then I would say that is definitely your problem.
And you are using shielded cable, correct?
Best regards,
Nah, I'm guessing he strung bare copper seperated by cotton balls.
That's what I like to use in my 27-floor 100tx runs.
Andy
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Works fine if you do it using x.25 
Actually andy, the oc192 wiccs in the 2600 series work better.
putting a shield on cat5 or 6 cable doesn't significantly increase the
noise rejection vs utp cat 5 at 100mb/s, you're shielding already
balanced cable pairs.
moreover they're signifcantly harder to install since they need to be
properly grounded and shielded at both ends.
joelja
Dang. Snapple -> out nose.
I hear aluminum coated dental floss is making a comeback in the wiring
racket...
From: joelja@darkwing.uoregon.edu [mailto:joelja@darkwing.uoregon.edu]
Sent: Friday, January 10, 2003 13:26
To: andy@xecu.net
Cc: alan_r1@corp.earthlink.net; steve@rudedogg.com; nanog@merit.edu
Subject: RE: fast ethernet limits
<snip>
moreover they're signifcantly harder to install since they need to be
properly grounded and shielded at both ends.
I've seen people use shielded CAT5 to protect it from interference but
they didn't bother grounding the shielding on either end....
In the "me too" category, I've seen a company install wireless on top of
the Netherland's highest building (The Rembrandt's tower), which included
using a lightning arrestor, and not ground it.
It only took 3 storms (and 3 wireless cards) before they finally decided
to ground the thing, and at the time, they weren't that cheap either
Paul
Joel Jaeggli wrote:
[...]
moreover they're signifcantly harder to install since they need to be
properly grounded and shielded at both ends.
I've actually seen some very impressive ground loops. I'd ground one
end. (Actually I'd use fiber, but hey.)
Peter E. Fry
AGREED, one end and one end only, or youre asking for a ground loop....ground the end with the best, shortest path to earth ground.....in his case, that would prob be the telco room end, "usually" theres a decent ground there somewhere.....
Mileage may differ...
Anybody else ever chased a grounding wire you suspected wasn't doing its job,
only to find that it was quite securely clamped to a large drain pipe only 4
feet from where it left the building? Sounds good, except that the pipe
transitioned from cast iron to PVC 2 feet from the exit point....
Yes, seen that and worse..
How about the di-electric fittings on either a water heater, or a water meter?
Of course, "no one" would use a HOT water line as a ground, but it does happen, and
I believe the NEC requires both be bypassed now with a conductor the same size as power neutral.
I routinely jump unbridged meters and water heaters (cold pipe to hot) with a #6 when in doubt.
Just to be sure.
I've got lots of #6 in the scrap box, and plenty clamps...
Cheap insurance..
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AGREED, one end and one end only, or youre asking for a ground
loop....ground the end with the best, shortest path to earth
ground.....in his case, that would prob be the telco room end, "usually"
theres a decent ground there somewhere..... Mileage may differ...
Some hours reading the back issues of the journal found at
http://www.compliance-club.com will hopefully inform you why star grounding
is a thing of the past. Ground both ends. If you are afraid of ground
loops, place a heavy (as in 10-16mm2 or AWG way below 10) ground conductor
alongside the signal cable, and ground it firmly in both ends. That will
take the current away from the shields.
Ungrounded shileds are inefficient for EMI and RF shielding, while at times
efficient AC hum blockers.
And, IANAEE, but I've played with big sound systems that exhibit all these
problems.
- --
M�ns Nilsson Systems Specialist
+46 70 681 7204 KTHNOC MN1334-RIPE
We're sysadmins. To us, data is a protocol-overhead.