Telecom connectors can be found at the end of telecom cables, used to transmit data and provide telephony services. The telecom connectors that you see in most homes and offices are Registered Jack (RJ) connectors. With the growth of fibre-optic technology, fibre-optic connectors are also an option.
Most telecom connectors are standardised so that it is easy to find connectors that work with any telephony system. The most common type of connector is the Registered Jack, which has a rectangular end that clips into place when inserted into the socket.
There are, however, a few variations within RJ telecom connectors. The RJ11 connectors are the most common type used for home phones, RJ12 connectors are typically used in system phones, and RJ14 connections are used in systems with two telephone lines.
Fibre optic telecom cables are a new entry in the world of telecoms, used by many telephone carriers because of their increased bandwidth. Standard RJ connectors will not work with these cables, and you can use specialist fibre-optic connectors instead.