it’s commonly but incorrectly referred to as RJ45, which is similar but has a keying lug built into the socket and plug. Modular connectors have stood the test of time for nearly 50 years now ...
And if you were to go back a few more years into the past, you’d have found when you bought a mouse with a PS/2 connector fitted, it may well have come with an adapter for a 9-pin RS232 serial port.
Description: . RJF allows you to use an Ethernet Class D / Cat. 5e connection for 10 BaseT,100 BaseTX or 1000 BaseT networks in harsh environments: With the patented RJStop®system you can use a ...