RJ-11 Phone Jack

RJ-11 is the six-position, two-conductor (6P2C) modular telephone connector codified by the U.S. FCC under Part 68 of the 1976 Carterfone-era regulations and later under TIA/EIA-568. The plug uses spring tabs to lock into a matching socket; pin assignments map line 1 to the centre two contacts (the outer four are unused on a 6P2C variant).

RJ-11 is the dominant analogue telephone jack worldwide outside the older European national standards. A standard US/Canadian phone cable plugs directly into RJ-11 sockets in over 220 countries. The connector is also used inside DSL modems, fax machines, answering machines, and any analogue PSTN device manufactured for export.

Where countries list their phone jack as "RJ-11 / X" the X is a country-specific connector that may be present at older wall outlets; modern installations almost always include an RJ-11 port. Travelers needing dial-up modem connectivity should carry a universal RJ-11 coupler for the few countries with non-RJ-11-compatible outlets.