How many wire pairs are required for Gigabit Ethernet?
- 3
- 4
- 6
- 2
EXPLANATION
How many pairs of wire does gigabit ethernet use on utp cable?
4 pairs of wires.
Ethernet Cat 5 cables have eight wires (four pairs), but under 10BaseT and 100BaseT standards (10 Mbps and 100 Mbps, respectively) only four (two pairs) of these wires are actually used. One pair is used for transmitting data and the other pair is used for receiving data.
Ethernet standard uses a technique against electromagnetic noise
called cancellation. As electrical current is applied to a wire, it
generates an electromagnetic field around the wire. If this field is
strong enough, it can create electrical interference on the wires right
next to it, corrupting the data that were being transmitted there. This
problem is called crosstalk.
Ethernet Cat 5 cables have eight wires (four pairs), but under 10BaseT and 100BaseT standards (10 Mbps and 100 Mbps, respectively) only four (two pairs) of these wires are actually used. One pair is used for transmitting data and the other pair is used for receiving data.
| Pin | Color | Function |
| 1 | White with Green | +TD |
| 2 | Green | -TD |
| 3 | White with Orange | +RD |
| 4 | Blue | Not Used |
| 5 | White with Blue | Not Used |
| 6 | Orange | -RD |
| 7 | White with Brown | Not Used |
| 8 | Brown | Not Used |
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