RJ stands for Registered Jack
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RJ stands for Registered Jack commonly used in Ethernet networking. The Ethernet cables has RJ45 connectors at both the ends.
The type of connector is used by the analog modems is RJ11 or RJ45.
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
1. Physical layer
It's an Ethernet port used for network connections.