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This list covers only single-line telephone plugs commonly used in homes and other small installations; there are 44 different variations of plugs, including an Israeli version of BS6312 with different internal wiring of the pins, plus hard wiring to a junction box with no adapter.
Cables sold as RJ11 often actually use 6P4C connectors (six positions, four contacts) and RJ14 wiring – four wires running to a central junction box. Two of its six possible contact positions connect tip and ring , and the other two contact positions may be unused or provide low-voltage power for night light or other features on the telephone ...
A domestic single British telephone line installation will have a single master socket or line box in the premises, which is provided by BT or another service provider: this socket is the demarcation point between the customer-owned and maintained on-premises wiring, and the telephone network.
The wires between the junction box and the exchange are known as the local loop, and the network of wires going to an exchange is known as the access network. The vast majority of houses in the U.S. are wired with 6-position modular jacks with four conductors wired to the house's junction box
The SAI provides the termination of individual twisted pairs of a telephony local loop for onward connection back to the nearest telephone exchange (US: "central office" (CO)) or remote switch, or first to transmission equipment such as a subscriber loop carrier multiplexer and then to the exchange main distribution frame (MDF).
Telephone wiring is required between the telephone company's service entrance and locations throughout the home. Often a home will have telephone outlets in the kitchen, study, living room or bedrooms for convenience. Telephone company regulations may limit the total number of telephones that can be in use at one time.
It may also use a 6P4C connector, to use an additional wire pair for powering lamps on the telephone set. RJ14 is similar to RJ11, but is wired for two lines and RJ25 has three lines. RJ61 is a similar registered jack for four lines, but uses an 8P8C connector.
The telephone jack of manual telephone switchboards, which is the socket fitting the original 1 ⁄ 4 inch (6.35 mm) telephone plug The 1 ⁄ 4 inch (6.35 mm) phone jack common to many electronic applications in various configurations, sometimes referred to as a headphone jack