Difference between RJ45 and RJ11

A registered jack (RJ) is a standardized network interface for connecting voice and data telecommunications equipment. The Registered Jack connectors – RJ45 and RJ11 are used with the UTP cables. RJ45: RJ45 is newer, modular, self-securing and compact technology used for connecting the ethernet cables to different electronic devices. The RJ45 is an 8 pin connector used to attach the ethernet interfaces. It is known as an 8P8C connector.

1. Straight-over cable
2. Crossover cable

RJ11: RJ11 is used to terminate the conventional PSTN telephone networks. RJ11 is a four pins connector which is used for terminating the telephone wires. The RJ11 technically uses the center 2 contacts of 6 available and is used for wiring a single phone line. It is the common connector for plugging a telephone into the wall and the handset into the telephone. Difference Between RJ45 and RJ11:

RJ-45	RJ-11
RJ-45 are used with ethernet cables.	RJ-11 are used for connecting telephone wires.
The structure of RJ45 is of larger size	The structure of RJ11 is comparatively small
Bandwidth supported by RJ-45 is 10 Gbps over ethernet	Bandwidth supported by RJ-1 is 24 Mbps
The number of wires connected with RJ45 is 8	The number of wires connected with RJ11 is 4
RJ45 is an 8P8C connector	RJ11 is an 6P4C connector

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