RJ-11 Connectors
RJ (Registered Jack) -11 connectors are small plastic connectors used on telephone cables. They have capacity for six small pins. However, in many cases, not all the pins are used. For example, a standard telephone connection only uses two pins, while a cable used for a DSL modem connection uses four.
RJ-11 connectors are somewhat similar to RJ-45 connectors, which are discussed next, though they are a little smaller. Both RJ-11 and RJ-45 connectors have small plastic flange on top of the connector to ensure a secure connection. Figure 5 shows two views of an RJ-11 connector.
Figure 5 RJ-11 connectors.