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DuraLAN Fast Ethernet NICs User’s Guide

Straight-through Cable

The majority of twisted-pair environments use twisted-pair cables
that are wired straight-through. This means that each pin of the
modular plug connector is wired to the same pin on the opposite
end of the cable (i.e., pin 1 is wire d to pin 1). Straight-thr ough cables
connect workstations and servers to repeaters and switches. Cables
for 100BASE-TX use two pairs (pins 1, 2, 3, and 6).
Figure A-1. Str aight-through Cable
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Pins used for TX