UTP直连线与交叉线对比 两个端口均标有或均没标有“X”时用交叉线. 有且仅有一个端口标记有“ X”时使用直连线. 1x 2x 3x 4x 1x 2x 3x 4x 1x 2x 3x 4x Purpose: This figure describes a simple way to determine whether one should use a crossover or straight thru cable.