Definition of RJ-11 (2024)

(Registered Jack-11) A telephone interface that uses a cable of twisted wire pairs and a modular jack with two, four or six contacts. RJ-11 is the common connector for plugging a telephone into the wall and the handset into the telephone. See modular connector.

RJ-11, 14, 25 - One, Two and Three Lines

RJ-11 cables can hold six wires for up to three telephone lines, and their nomenclature is technically RJ-11, RJ-14 or RJ-25 depending on the number of lines (see chart below).

RJ-21X, RJ-26X and RJ-27X

For PBX and other telecom connections, RJ-21X, 26X and 27X cables use a 50-pin Centronics-style "Miniature Ribbon" connector to handle 25 telephone lines in one cable.

C and W

The C refers to a desk phone jack, such as RJ-11C, while RJ-11W means a wall-mounted jack. See modular connector.

Definition of RJ-11 (1)RJ-11 ConnectorsFour-wire RJ-11 connectors (6P4C) are commonly used for telephone handsets and wall outlets. The six-wire variation (6P6C) is used for three telephone lines (see below).

    Jack     Positions (P) RJ U.S. and Type Wire Pair Colors Contacts (C) RJ-11 Line 1 - red-green 6P2C RJ-14 Line 1 - red-green 6P4C Line 2 - yellow-black RJ-25 Line 1 - red-green 6P6C Line 2 - yellow-black Line 3 - blue-white

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Definition of RJ-11 (2024)

FAQs

What is the full meaning of RJ11? ›

The registered jack 11 (RJ11) is a type of connector commonly used for telephone cables. It has four or six pins and is used to connect phones, modems, and other telecommunication devices to a wall jack or other phone line.

What is an example of a RJ11? ›

For example, RJ11 comes in two forms: RJ11W is a jack from which a wall telephone can be hung, while RJ11C is a jack designed to have a cord plugged into it. A cord can be plugged into an RJ11W as well.

How to identify RJ11? ›

RJ45 has 8 wires inside while Rj11 has 4 wires. RJ45 is bigger in size than RJ11. You cannot plug-in the RJ45 cable connector into an RJ11 jack/interface/port/slot, however, you can do the opposite. Plugging an RJ11 cable into an RJ45 jack/interface/port/slot is the most common mistake that might happen.

What are the advantages of RJ11? ›

What are the disadvantages and advantages of an RJ11 connector? - Quora. Advantages - they are cheap and reliable. These are the 4 to 6 pin plastic connectors used on most wired telephones since the 1980s.

What does RJ stand for? ›

A radio jockey, abbreviated RJ, is the host of a radio talk program, podcast, or music show. In layman's terms, a Radio Jockey is the host of a radio broadcast.

What is the code RJ11? ›

The Regional Transport Office of Dholpur city operates under RTO Rajasthan and uses the RTO codes RJ11. The RTO Dholpur issues RC, driving license and other documents to a vehicle purchased in Dholpur.

What does a RJ11 port look like? ›

RJ11 connectors are small, compact, and square-shaped, while RJ45 connectors are rectangular, bigger, and longer. RJ11 is usually a 6P2C or 6P4C standard, which is regarded by Americans to be a useful telephone plug. RJ45 uses an 8P8C standard, which means that it has 8 positions and 8 contacts.

What is the difference between RJ11 and telephone cable? ›

Ethernet and telephone cables look fairly similar and it is not uncommon to get the two mixed up. The key difference between the two is the size of the plastic connectors on the ends of the cable. Telephones use an RJ11/RJ12 connector whereas Ethernet uses RJ45. RJ11/RJ12 only uses 4-6 pins whereas RJ45 uses 8 pins.

What can you do with RJ11? ›

RJ11 connectors are one of the many modular connector types that are used for telephone, telephone connector wiring and networking applications. It has 6 pins, of which typically only 4 are used. Its connectors are used in RJ11 jacks to connect telephone instrument and cable.

Is RJ11 used anymore? ›

Despite the advent of newer technologies, the RJ11 connector is still prevalent in many homes today. It is commonly used to connect phone lines, fax machines, and dial-up internet connections.

What is RJ11 for network? ›

No, you cannot use an RJ11 for Ethernet. RJ11 and RJ45 connectors are different and have different purposes. RJ11 is used for terminating telephone lines, while RJ45 is used for ethernet networking. The size of the two connectors is different, with RJ45 being bigger in size than RJ11.

What does RJ11 6P4C mean? ›

Product Description RJ11 plugs are a type of plug typically used for carrying telephone signals. 6P4C means that the contacts on these plugs have 6 positions in which are placed 4 gold plated contacts, a standard for RJ11 jacks. These plugs are also designed for use with stranded wire.

What is RJ11 and RJ12? ›

RJ12 is the most common, being used on flat line cords that connect the base of a telephone to the wall. RJ11 is an older version of RJ12, and they are the same size. The difference is that RJ11 uses four internal wires (called conductors) while RJ12 cable uses six.

What does RJ stand for in RJ45? ›

The “RJ” in RJ45 stands for Registered Jack, a standard designation that originated with the Universal Service Ordering Code (USOC) scheme of the Bell System back in the 1970s for telephone interfaces.

What is the difference between RJ11 and Ethernet cable? ›

Phone Cables – What's the Difference? Ethernet and telephone cables look fairly similar and it is not uncommon to get the two mixed up. The key difference between the two is the size of the plastic connectors on the ends of the cable. Telephones use an RJ11/RJ12 connector whereas Ethernet uses RJ45.

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