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At present, there are three types of computer network standards.<br>A single twisted pair holmium twisted par41 holmium in each twisted pair, which is standard. In order to reduce electromagnetic interference and adjacent cables through the same cable or external. Because two-wire is cheap, data transmission and light weight, easy to install and widely used. For example, there are two types of phones.<br>1.1.1 twisted pair, insulating layer holmium shield twisted pair, holmium hipjust41 is another form of a single twisted pair insulating layer. Prevent electromagnetic interference.<br>
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