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UTP Cabling Pinouts for 1000BASE-T

1000BASE-T (Gigabit Ethernet) differs from 10BASE-T and 100BASE-T as far as the cabling
and pinouts. First, 1000BASE-T requires four wire pairs. Second, it uses more advanced
electronics that allow both ends to transmit and receive simultaneously on each wire pair.
However, the wiring pinouts for 1000BASE-T work almost identically to the earlier standards,
adding details for the additional two pairs.

The straight-through cable connects each pin with the same numbered pin on the other side,
but it does so for all eight pins—pin 1 to pin 1, pin 2 to pin 2, up through pin 8. It keeps
one pair at pins 1 and 2 and another at pins 3 and 6, just like in the earlier wiring. It adds a
pair at pins 4 and 5 and the final pair at pins 7 and 8 (refer to Figure 2-10).

The Gigabit Ethernet crossover cable crosses the same two-wire pairs as the crossover cable
for the other types of Ethernet (the pairs at pins 1,2 and 3,6). It also crosses the two new
pairs as well (the pair at pins 4,5 with the pair at pins 7 ,8).

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