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Does Ethernet use all 8 wires?

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Does Ethernet use all 8 wires?

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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.Oct 10, 2005

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