10BASE-T Pin Assignments
Caution: Regulations regarding the connection of equipment to
telephone networks vary from country to country.
Check with your local telephone network supplier
before using existing telephone wiring.
An Ethernet twisted-pair link segment requires two pairs of
wires. Each wire pair is identified by two different colors. For
example, one wire might be red and the other, red with white
stripes.
Caution: Each wire pair must be attached to the RJ-45 connec-
tors in a specific orientation (see “Crossover Function”
in Chapter 3 for an explanation).
RJ-45 Connectors
Each twisted-pair link seg-
ment must have an RJ-45
male connector attached to
both ends. According to the
10BASE-T specification,
pins 1 and 2 are used for
transmitting data, and pins 3
and 6 for receiving data.
* The “+” and “-” signs are used to represent the polarity of the two
wires that make up each wire pair.
Note how the
pins are num-
bered. Be sure
to hold the con-
nectors in the
same orientation
when attaching
the wires to the
pins.
54
CABLES
Pin Number Assignment*
1 Tx+
2 Tx-
3 Rx+
6 Rx-
RJ-45 Pin Assignments
RJ-45 Connector Pin Numbers
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