网线的直连线与交叉线（The straight line and cross line of a network cable）.docVIP

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网线的直连线与交叉线（The straight line and cross line of a network cable）.doc

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网线的直连线与交叉线（The straight line and cross line of a network cable）

网线的直连线与交叉线（The straight line and cross line of a network cable） The straight line and cross line of a network cable The line order of the network cable is divided into two kinds: 568A and 568B. Standard 568A line order: 1-, green, white, 2- green, 3-, orange, white, 4- blue, 5- blue, white, 6- orange, 7-, palm white, 8- brown; Standard 568B line order: 1-, orange, white, 2- orange, 3-, green, white, 4- blue, 5- blue, white, 6- green, 7-, brown white, 8- brown; The same line is used at both ends of the same cable line; the two line of the same cable line uses a different line sequence. That is, both ends of the network cable use 568A or 568B is a straight line; both ends of the network cable with one end of the 568A, 568B at the end of the cross line. In practice, 568B is commonly used, and 568B is generally considered as a better shielding against electromagnetic interference. The through line is used to connect computers and switches (or HUB), routers and switches (or HUB). Cross lines are used to connect computers and computers, routers and routers. Crossing lines are not often used. LAN is a separate microcomputer or terminal, using the network to connect with each other, followed by certain agreements, exchange of information, sharing of resources. Commonly used network cable: twisted pair, coaxial cable, optical fiber and so on. Twisted pair can according to whether external shielding layer of metal mesh is divided into sets of shielded twisted pair (STP) and unshielded twisted pair (UTP). From the cost performance and maintainability, most LANs use non shielded twisted pair (UTP, -Unshielded, Twisted, pair) as the routing medium for networking. The UTP cable is made up of a pair of twisted pair lengths and RJ45 crystal heads The twisted pair is composed of 8 different colors on the line into 4 pairs twisted twisted together, the effect of as much as possible to reduce the electromagnetic radiation and external electromagnetic interference. In EIA / TIA568 stan