RJ11 Color Code

Registered Jack

The Registered jack is a network interface to connect various data equipment and telecommunication systems to provide the services offered by the telephone exchange. The local channels then exchange data for the shorter or longer-distance carriers. It offers network cabling, fixing wires, and jack construction. Customers and telephone companies have to register through the registration interface to deliver and manage the physical installation of jacks and wires this was made mandatory in the year 1970 by Federal Communications Commission (FCC) and registered connections have brought to real-time usage in the year 1973 with the physical setup of wires, signaling process.

Standard interfaces were provided to the customers and telephone companies to provide Integrated Services and Digital Network (ISDN) features. Later in the year 1990, modular jacks were invented and it’s standardized in IEEE 802.3i that incorporates enhanced features than the earlier versions.

The registered jack is termed a female connector (Jack) and a male connector (Plug). RJ cables are categorized based on size, number of pins, structure, color codes, etc. The most known standards of RJ that are widely used for data sharing are RJ 11, RJ 14, RJ 61, RJ 21, RJ 25, and RJ 48.

RJ 11

This is a popular model used in home and office networks where telephone lines are connected with Internet Service Providers (ISP), also known as Plain Old Telephone Service (POTS). It consists of four or six wire connectors to connect telephone lines. 6 pins are in RJ 11, where every two pins are used for transmission configuration, the next two pins are for receiver configuration and the rest of the two pins are reserved. Each pin has positive and negative terminals used during the setup process.

RJ 11, RJ 14, and RJ 25 all these standard jacks use a six-position connector that is the same in physical appearance and differs by the number of contacts that allow one, two, or three telephone connection lines. 62PC connector is needed for the cords that connect to RJ 11 interface. Tip and ring conductor terms are used in the connection contacts, which are the two sides of telephone line plugs. The tip is used to transmit audio signals and the ring provides power to the telephone line.

RJ 11-W is the next enhanced version of RJ 11 to make bridge connections to telephone lines which has various wall mounting options.

Wiring in RJ11 can be done by understanding the color codes and their combination which is used to carry voice or data signals. This connector is divided into 3 parts striped blue-white pair, an orange-white pair, and green white pair. A single telephone line requires only one pair of wires, two telephone lines use two pairs of wires, and the third pair is used by three telephone lines. This jack supports modem, fax, and telephone carrier signals and can also be plugged into RJ45.

Color code

Color codes are used in RJ 11 to recognize the connected conductors and their functions, which may vary based on the cabling types and applications used. In POTS, systems RJ 11 has four color codes red, green, yellow, and black for the transmission and signalizing process, then extra two colors blue and white were added in data communication systems.

The standard color code with the wire connections is green wire as pin 1 with tip connection, red wire as pin 2 with Ring connection, Black wire as pin 3 with Ring connection, and yellow wire as pin 4 with tip connection in a telephone cable. These coloring codes and pin configurations can vary based on the manufacturers and the applications where they install RJ connectors. When making the wiring setup and configuration process, it is always recommended to refer to the device-specific documentation given to the customer at the time of purchase.

Ways of RJ 11 connection

Below given are a few examples where RJ 11 cable can be used in various types of applications −

  • Single line connection − In this connection, 11 connector links single line telephone to one telephone jack. The green wire would be attached to the tip and the red color wire is connected to the ringside.

  • Modem connection − RJ 11 connects the modem device or port to the telephone line. Here, the green color wire is plugged in to tip, and the red wire is attached to the ring end.

  • Two-line connection − RJ 11 connector connects a two-line connection to a telephone jack. The first line has a green wire with a tip and red wire connected to the ring and the second line has black wire plugged into the tip and the yellow wire is linked to the ring end.

RJ 11 is a standard connector used for telephone line connections and it has a four or six-pin connection to send voice (analog) data through telephone lines, fax, or modem devices. It supports bandwidth up to 24 Mbps and it can be connected to RJ 45.

This registered jack provides color codes or color schemes to differentiate on wiring and connections to modem or single or two connection telephone data lines. Combinations of these colors vary from traditional telephone processes and present data communication standards.

Registered Jack connectors have several advantages in factors like easy installation, and high connection speed as they are connected within the interfaces but can be reliable only within shorter networks and always needs manual wiring and configuring the equipment before being used.

Updated on: 03-May-2023

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