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目前,微机局域网在国内发展非常迅速。非屏蔽双绞线作为网络传输介质,因其价格便宜、施工方便,在中、小型局域网中得到广泛的应用。在布线设计和施工中如果不注意对电磁场干扰采取适当的屏蔽措施,有可能导致网络信号传输不稳定(例如:用户有时能登录上网,有时不能登录;网络响应速度变慢等等),干扰严重时,将导致网络瘫痪。势必造成返工重新布线,这样不仅施工难度大,而且给用户造成物质上和时间上的损失。 根据《民用建筑电气设计规范》(JGJ/T 16-92)第26.8.1条及第26.4.4条的规定,双绞线应穿钢管或金属线
At present, the microcomputer LAN is developing very rapidly in China. Unshielded twisted pair as a network transmission medium, because of its cheap, easy construction, in medium and small LAN has been widely used. If you do not pay attention to the shielding design for the electromagnetic field interference in the wiring design and construction, it may cause unstable signal transmission in the network (for example, the user may sometimes log in to the Internet, and sometimes can not log in; the network responds slowly, etc.) and the interference is serious When will cause the network to paralyze. Rework will inevitably lead to rework, so that not only difficult to construct, but also to the user caused material and time losses. According to Article 26.8.1 and Article 26.4.4 of Code of Electrical Design for Civil Buildings (JGJ / T 16-92), the twisted pairs shall be clad in steel pipe or wire