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Is it okay to use RJ 45 as the Ethernet cable? For this computer , the LAN interface is RJ45.

Can it be connected to a router? Any speed difference?

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The name RJ45 is a kind of a historical accident. It originally referred to a telephone company wiring standard. Common 10/100/1000 Ethernet wiring uses the same physical jack, but a different wiring. But since the jack was the same, it took the name. So now RJ45 basically refers to just the jack. Technically, it should have been called 8P8C, but it is what it is.

So when they say RJ45, they just mean the standard Ethernet jack that all common wired devices have. A regular Ethernet cable will connect correctly to that jack.

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Thank you very much. It is clear. –  CppLearner Mar 27 '12 at 18:19

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