Ccna routing and Switching Complete Study Guide

UTP Gigabit Wiring (1000Base-T)

In the previous examples of 10Base-T and 100Base-T UTP wiring, only two wire pairs were 

used, but that is not good enough for Gigabit UTP transmission.

1000Base-T UTP wiring (Figure 2.13) requires four wire pairs and uses more advanced 

electronics so that each and every pair in the cable can transmit simultaneously. Even so, 

gigabit wiring is almost identical to my earlier 10/100 example, except that we’ll use the 

other two pairs in the cable.

f i g u r E   2 .13     UTP Gigabit crossover Ethernet cable

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

For a straight-through cable it’s still 1 to 1, 2 to 2, and so on up to pin 8. And in creat-

ing the gigabit crossover cable, you’d still cross 1 to 3 and 2 to 6, but you would add 4 to 7 

and 5 to 8—pretty straightforward!