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There are RJ-11, RJ-12, and RJ-45 connectors. RJ-11 is typically used for telephone lines, while RJ-45 is used for NICs.
The full form of RJ-45 is registered jack 45.
An RJ-45 connector has 8 pins.
RJ stands for registered jack. There are a no. of RJ's that we use for e.g., RJ-9 ,RJ-11 RJ-12, RJ-45, RJ-48 etc
are you sure you don't mean RJ-45 ?