非屏蔽双绞线的应用基础

针对用户在选择网络线缆时存在的“高级非屏蔽双绞线并不比低级产品好”的观点，从衰减、串扰、阻抗及回波损耗等方面分析了非屏蔽双绞线的物理特性，从而证明了上述观点是不正确的，是由于对双绞线物理特性参数的看法过于表面化而造成的。

The Application Foundation of Unshielded Twisted Fair Line

In the light of the opinion that the high-level unshielded twisted fair line isn't better than the low-level one existing in the selection of the network wires by the users, this paper analyzes on the physical features of the unshielded twisted fair line from aspects of the attenuation, crosstalk, impedan ce and returnloss, etc., approving that the previous opinion, which isn't right, is caused by the judgment for the physical characteristic parameters of the twi sted fair line is too apparent.