WARNING! Do Not Insert An RJ11 Plug Into an RJ45 Socket

RJ11 plugs can permanently damage your RJ45 socket.

Data cabling systems normally use RJ45 connectors. These have eight pins. Many analogue phones, however, are fitted with an RJ11 connector. These are smaller and have four 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.  DO NOT DO THIS because it may damage the RJ45 socket by pushing pin 1 and pin 8 so far into the housing that they may never return to their former positions when the RJ11 connector is removed. If the link is then needed for a data connection, it will probably fail.

The right way to use an RJ11 connector in a data cabling system is use an RJ11 to RJ45 adapter.

I’m not making this up, I’ve seen the problem on several occasions.

Alan Bullen

Managing Director
Lynx Networks, MIlton Keynes, UK.

RJ45 and RJ11

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