RJ11 plugs
can permanently damage your
RJ45 socket. Data cabling systems normally use
RJ45 connectors. These have eight pins. ... It's easy to insert an
RJ11 plug into an
RJ45 socket and it will probably work for a voice
connection if the other end of the link has the right wiring or the correct adapter.
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It is possible to physically fit an RJ11 connector into an RJ45 receptacle, however this will never function for an actual Ethernet connection. The reason is that the RJ45 connector has 8 pins, while the RJ11 has only at most 6.