Cat 5 Ethernet (LAN) Wiring

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Note: Only pairs 2 and 3 are used for Standard Ethernet wiring.  Pairs 1 and 4 can be used for other purposes such as telephones or often, a second separate, complete Ethernet connection (adapters are made for this purpose).

Standard, Straight-Through Wiring
(both ends are the same):

Straight-Through Wiring Using The 586A Standard

Cross-Over Wiring Using The 568A to 586B Standards