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Plug and Socket Wiring Details - T568A
NOTE: There are various wiring "standards". Some
standards have different arrangements of colours. The basic configuration uses two pairs
of wires ... Pair 1 - 2 and Pair 3 - 6. The other four wires are connected, but not used.
In some standards, the wires in each active pair cross over.
(To find out about "Balanced Transmission Lines"
Also see: http://www.cabletron.com/support/techtips/tk0231-9.html
- A great starting point for UTP CAT 5 wiring conventions. (NOTE: The diagrams are based
on Standard T568B! The colour arrangement is different from the T568A Standard shown
at the top of this page.)
Also see: http://www.netspec.com/helpdesk/wiredoc.html
For an absolutely wonderful page on how to
assemble RJ45 connectors see: http://www.lanshack.com/make-cat5E.asp
Crossover Cable - For connecting TWO (and only two)
computers together. If possible use a different coloured cable, or mark it very clearly.
If someone picks up your 'crossover' cable later and tries to use it as a conventional
network cable, it won't work! Generally crossover cables are RED.
NOTE: A "crossover" cable is wired
with T568A at one end and T568B at the other.
Rollover Cable -
A Rollover cable is used to connect between a computer and the
"Console" port on a Router to allow programming of the Router. To make a
rollover cable you arrange wires as per a standard patch lead of either type
"A", or "B" with the jack on one end "rolled
over". ie you turn the jack upside down and then insert the wires. (NOTE: you
only 'flip' one end, not both!) Commercial rollover cables are
usually made from flat cable to avoid confusion. If you cannot find flat cable you should
cable when making rollover cables.
Wiring a Wall Plate -
From Wally Krueger ... if you look at an RJ45 wall plate (socket) from the back side the lower right
wire is pin number 1. It then follows that pins 1,3,5, & 7 are on the bottom
from right to left. The top row are pins 2,4,6, & 8. I wired my CAT5 cable
to the wall plate using the same sequence as my straight through cable and
everything works perfectly.
Wiring a Wall Jack -
From Noel Moyes ...
A Simple Cable Tester
How it Works - The wires in CAT 5
Unshielded Twisted Pair (UTP 8-wire) are arranged in
pairs. (Pin1/Pin2, Pin3/Pin6, Pin5/Pin4, Pin7/Pin8). The circuit below is designed so that
when the ends of a UTP cable are plugged into each of the "RJ45 Sockets", the
circuit for each pair is completed and the LEDs light up. If there is a break in a wire
(or the leads are incorrectly terminated) the corresponding LED will not light. For remote
testing (where you can't get at both ends) cut the board apart and plug the
"terminator" section into one end and the "Tester" end into the other.
- I haven't tested over how long a distance it will work. Good Luck!
NOTE: This circuit will not indicate if the wires
in a pair are crossed over. I haven't tried it yet, but it should be possible to modify
the circuit and use 'Bi-polar' Red/Green LEDs instead of conventional LEDs to indicate
A completed example from Dean