中山志合电线
电缆中的对绞起什么作用
发布日期:2019-06-08 14:29:42

志合电线电缆-线缆行业前沿资讯,线缆知识百科,谢谢关注。部分文章来自于网络,如有侵权,请友好告知,我们会第一时间删除,谢谢!

每对不同的绞距,它是用来区分开每对线传输时的磁场间效应,减少相邻对间的影响。双绞线之所以要进行对绞,原因就是为了避免串绕的影响。

当传输线路中存在有若干个线对(双绞线为四个线对)且传输线路较长,由于每对线构成的回路面积太大,线对之间的串扰和外界干扰都非常严重。为了减小线对之间的串扰及外界干扰,只能采用 "交叉"技术,即将平行传输的线对按照一定的紧密度相互绞合。这样,就能够将每个线对构成的回路分割成若干个小的回路,每个回路中感生的串扰和干扰可以相互抵消一部分,从而达到减小串扰和干扰的效果。所以,每单对双绞线的绞结越紧密,绞距越均匀,四对线绞距差越大,其低频抗干扰能力越强、线对内部的串扰越小,传输数据的性能也就越好。

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