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Rj11 vs. Rj45 In this lesson we introduce you to the two types of twisted pair cabling connectors, Rj11 and Rj45 and examine the differences between the two. You'll see example of what each cables pin connectors look like, learn how they function, what the obvious differences are in their physical design and capabilities, and which one actually carries electricity and why. We'll discuss where each cable and pin connector is used, why they use is not transferable, which has power going thru and how to correctly handle when making repairs to them