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5406554-2 1×6 Multi-Port RJ45 Female Stock Connector

The difference between RJ and RJ11
Different standards, different sizes. Due to the different sizes of the two (RJ11 is 4 or 6-pin, RJ is an 8-pin connection device), obviously the RJ plug cannot be inserted into the RJ11 jack. The reverse is physically feasible (the RJ11 plug is smaller than the RJ jack), which makes people mistakenly believe that the two should or can work together. This is not the case. It is strongly recommended not to use RJ11 plugs for RJ jacks.
Because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. do not conform to the international standard connector design requirements, so interoperability cannot be guaranteed. They even cause the destruction of both. Since the RJ11 plug is smaller than the RJ jack, the plastic parts on both sides of the plug will damage the metal pins of the inserted jack.