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Posted by glen herrmannsfeldt on February 24, 2007, 12:55 am
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wattywatts@gmail.com wrote:
> hi, im trying to run an internet connection into our mess room at work
> which is about 25 meters away from the office where the computers and
> modem etc are. in the office the modem is connected to a router then
> in to a switch to feed the several computers, i have connected a short
> patch cable from a spare socket on the switch to my laptop and all is
> fine, but when i run a length (about 25 meters) of cable down to the
> mess room it will not connect(starts to aquire a netwok address then
> stops and starts again repeatedly), is the length of the cable the
> problem and if so is there anyway round it, the cable is the copper
> core (solid) type cat5 cable.
99% of the time this is due to mispaired cables. The other
1% are due to bad crimps. Well, for solid wire, maybe 3% due
to bad crimps.
It must be such that pins 1 and 2 are a twisted pair, and
pins 3 and 6 are another twisted pair. You might as well do
the others, with pins 4 and 5 one pair and 7 and 8 the fourth.
(You need all four pairs for gigabit.)
Best is to use one of the standards, 586A or 586B.
A mispaired cable will work over short distances, maybe
about 10 feet for 10baseT and one foot for 100baseTX.
(and 0.1 foot for 1000baseT). The actual distance depends
on which wires are used for which pins.
-- glen
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