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RJ45 Straight-through and Cross-over Cabling standards

The information listed here is to assist Network Administrators in the color coding of Ethernet cables. RJ-45 conductor data cable contains 4 pairs of wires each consists of a solid colored wire and a strip of the same color. There are two wiring standards for RJ-45 wiring: T-568A and T-568B. Although there are 4 pairs of wires, 10BaseT/100BaseT Ethernet uses only 2 pairs: Orange and Green. The other two colors (blue and brown) may be used for a second Ethernet line or for phone connections. The two wiring standards are used to create a cross-over cable (T-568A on one end, and T-568B on the other end), or a straight-through cable (T-568B or T-568A on both ends). Please be aware that modifying Ethernet cables improperly may cause loss of network connectivity. Straight-Trough Cable: To create a straight-through cable, you have to wire T-568A or T-568B on both ends of the cable. […]