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RJ45 vs RJ11: The difference between RJ45 and RJ11?

August 16, 2019

  1. Different standards, different sizes (RJ11 has 6P6C6P4C4P4C4P2C, where C stands for the number of gold needles in the crystal head; RJ45 has 8P8C).

     

  2. Due to the different sizes of the two (RJ11 is 4 or 6 pins, RJ45 is 8-pin connector), it is obvious that the RJ45 plug cannot be inserted into the RJ11 jack. The reverse is physically feasible (the RJ11 plug is smaller than the RJ45 jack), which makes people mistakenly think that the two should work together. This is actually not the case. It is highly recommended not to use the RJ11 plug for the RJ45 jack.

     

  3. Because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not uniformly in accordance with international standard connector design requirements, so it cannot be guaranteed to be interoperable. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 jack, the plastic part on both sides of the plug will damage the metal pin of the inserted jack.​

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