RJ-11
(Registered Jack-11) A telephone connector that holds up to six wires. RJ-11 is the common connector used to plug a telephone into the wall and also plug the handset into the telephone.
RJ-14 and RJ-16
RJ-11 jacks can hold six wires, but jacks and cables typically have four, which accommodates two-line phones (red-green and yellow-black wire pairs). When two lines are used, the jack is technically an RJ-14. When all six wires are used for three telephone lines, the jack is an RJ-25.
C's and W's
An RJ-14C refers to a desk phone jack, while an RJ-14W means wall mounted.
 |
| RJ-11 Connectors |
|---|
| Four-wire RJ-11 connectors are used for telephone handsets and wall outlets. There is also a six-wire variation (RJ-16) for three-line phones. |
| (hardware, communications) | RJ-11 - An American-style telephone jack
with six possible connections. A telephone normally uses two
pairs of wires. Often found on the back of US-manufactured
modems or for connection to a leased line. | |