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双绞线的线对为什么要设计成12 36 45 78，而不是更自然的12 34 56 78？首先，总的结论是这是个兼容性设计。这里说的兼容，是指RJ45插座要向下兼容4脚的RJ11。 那就要先说说RJ11了。其实很多人甚至没见过4触点的RJ11 ...
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