RJ-11 vs RJ-14: Difference and Comparison

RJ-11 has 4 conductors, supporting one phone line, whereas RJ-14 has 6 conductors, enabling the provision for two separate phone lines or one line with an additional function like fax or modem. RJ-14 connectors are identifiable by the presence of two center pins.

Key Takeaways

  1. RJ-11 and RJ-14 are both types of phone connectors with a different numbers of pins.
  2. RJ-11 has four pins and is used for connecting a single phone line.
  3. RJ-14 has six pins and can connect two or a single line with an extra feature.

RJ-11 vs RJ-14

RJ-11 is a four or six-wire connector for connecting a single phone line to a telephone set, used in homes and small offices. RJ-14 is a six-wire connector that can accommodate up to two lines, commonly used in larger homes and small businesses where two phone lines are needed.

RJ 11 vs RJ 14 2

RJ11 or registered jack 11 is also commonly known as a phone connector or modem port. The US Commission used them for connecting telephones to modems and is not also used for connecting them to the internet connection.

They also have different types, like RJ11s and RJ11w.

RJ14 or registered jack 14 is also known as two-wire connectors, as they have two telephonic lines that can connect to two phones. They are 6P4C connectors with six pins and four contacts.

They are commonly used in leased connections in the US. They are also used in US-manufactured modems.

Comparison Table

Number of wires24
Number of pins4 (2 rows of 2)6 (2 rows of 3)
Connector type6P2C (6 Position 2 Conductor)6P4C (6 Position 4 Conductor) or 6P6C (6 Position 6 Conductor)
PurposeSingle phone lineTwo phone lines or data transmission
SizeSmallerSlightly larger
CompatibilityCan be used with some 6P4C connectorsRequires a compatible 6P4C or 6P6C connector
Common applicationsStandard telephone connectionsMulti-line phone systems, fax machines with phone capabilities, older alarm systems

What is RJ11?

RJ-11, short for Registered Jack-11, is a standardized physical interface primarily used for connecting telephone equipment. It is widely recognized for its modular connector design, which features either four or six conductors. The RJ-11 connector is commonly employed in residential and small business settings to establish telephone connections.

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Structure and Configuration

The RJ-11 connector consists of four or six pins arranged in a modular plug. The standard configuration includes four conductors, organized into two pairs. Each pair serves a distinct purpose, supporting a single telephone line. The conductors are color-coded to facilitate proper wiring and connection.

Common Applications

  1. Telephone Connections: RJ-11 connectors are predominantly utilized to link telephones to telephone lines, enabling voice communication.
  2. Fax Machines: Fax machines utilize RJ-11 connectors to connect to telephone lines for sending and receiving fax documents.
  3. Modems: Many dial-up modems utilize RJ-11 connectors to establish connections to telephone lines for internet access.

Compatibility and Variants

RJ-11 connectors are widely compatible with standard telephone jacks found in households and businesses. However, it’s essential to note that while RJ-11 connectors are prevalent, they may not be suitable for all telecommunications equipment, particularly those requiring additional functionalities.

rj11 1

What is RJ14?

RJ-14 is a variant of the Registered Jack (RJ) connector standardized for telecommunications equipment. It is an extension of the RJ-11 design, offering additional functionality by accommodating multiple telephone lines or supporting supplementary devices like fax machines or modems. The RJ-14 connector is characterized by its six-conductor configuration, providing increased versatility compared to the traditional four-conductor RJ-11.

Structure and Configuration

The RJ-14 connector features six pins arranged in a modular plug, expanding upon the four-conductor layout of the RJ-11. These additional conductors allow for more complex wiring configurations, enabling the provision of two separate telephone lines or the integration of auxiliary devices such as fax machines or modems.

Enhanced Functionality

The primary advantage of the RJ-14 configuration is its ability to support multiple telephone lines within a single connector. Each of the six conductors can be utilized to establish connections for two distinct telephone lines. Alternatively, the additional conductors can be employed to accommodate supplementary devices, such as fax machines or modems, while still maintaining at least one active telephone line.


  1. Multiple Telephone Lines: Businesses and residences with multiple telephone lines can benefit from RJ-14 connectors, which facilitate the connection of two separate lines using a single jack.
  2. Integrated Telecommunications Systems: RJ-14 connectors are integral components of integrated telecommunications setups, allowing for the simultaneous operation of multiple phone lines alongside supplementary devices like fax machines or modems.
  3. Home Office Configurations: Home offices or small businesses utilize RJ-14 connectors to establish versatile telecommunications setups, enabling both voice communication and the integration of additional equipment for tasks such as faxing or internet access.
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Compatibility and Considerations

While RJ-14 connectors offer enhanced functionality compared to RJ-11, compatibility considerations are essential. Devices and infrastructure must support the six-conductor configuration to leverage the capabilities of RJ-14 connectors fully. Additionally, proper wiring and configuration are crucial to ensure seamless operation and prevent signal interference or cross-talk between lines.


Main Differences Between RJ11 and RJ14

  • Number of Conductors:
    • RJ-11: Typically has four conductors arranged in two pairs, suitable for a single telephone line.
    • RJ-14: Features six conductors, offering support for either two separate telephone lines or one line with additional functionality.
  • Functionality:
    • RJ-11: Primarily used for basic telephone connections, supporting voice communication.
    • RJ-14: Offers enhanced versatility by accommodating multiple telephone lines within a single connector or integrating supplementary devices like fax machines or modems.
  • Applications:
    • RJ-11: Commonly found in residential and small business settings for standard telephone connections.
    • RJ-14: Utilized in scenarios requiring multiple telephone lines, such as businesses or home offices, and for integrating auxiliary equipment like fax machines or modems.
  • Compatibility:
    • RJ-11: Widely compatible with standard telephone jacks and equipment, prevalent in most residential and commercial environments.
    • RJ-14: Requires compatible infrastructure and devices capable of supporting the six-conductor configuration to leverage its enhanced functionality effectively.
Difference Between RJ 11 and RJ 14
  1. https://www.tandfonline.com/doi/abs/10.1080/14623943.2015.1064379
  2. https://core.ac.uk/download/pdf/159180559.pdf

Last Updated : 29 February, 2024

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21 thoughts on “RJ-11 vs RJ-14: Difference and Comparison”

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