On 3/8/2011 5:05 PM, Tegger wrote:
The Daring wrote in
:


It has to do with the varying twist of the pairs. When I run a
certification test on network cables, the separate pairs check
out at different lengths then I get an average length from the
test equipment. If you run a Cat6 Gigabit connection, all four
pairs are used for the data as opposed to only two pair when a
10/100 connection is used. Good wiring practice demands that no
cable ties are cinched real tight on any network cables or bundles
of network cables. Sharp bends in Cat5/6 can also alter the signal
capabilities of the network cables. I can test a length of network
cable with my certifier, get a good reading then make a sharp 90°
bend in the cable and it will fail the test.



I've seen many large-company installations with cable ties reefed as tight
as they'll go, and with sharp bends around corners. I've often wondered if
their employees have network problems.



Me and a helper spent 6 hours 50 feet in the air at a Sam's Club one
night so we could trace out a fiber optic cable from the second floor
server room at the front of the huge store all the way to the back so
we could find a switch that corporate IT had no idea of its location.
From the switch we had to find a wireless access point 320 feet away
on a Cat5 cable to troubleshoot it. All that trouble was caused by a
goober improperly installing an RJ45 plug 50 feet in the air! I find
silly crap all the time that keeps a network from communicating. My
favorite is when somebody tries to see how far they can stretch a Cat5
cable. Pull it hard enough and it will stretch, it kind of messes up
the impedance of the cable but they made it fit. :-)

TDD