RJ11 Connector

What is RJ?

   

RJ is the abbreviation of Registered Jack, which is used to describe the standard plugs and sockets for various telephone and data interfaces. RJ plugs and sockets are widely used in telephone lines, Ethernet, ISDN (Integrated Digital Service Network), and other communication fields. Common RJ plugs include RJ11 and RJ45, which are used for telephone line and network cable connections respectively.

   

What is RJ11?

   

The RJ11 crystal head is very similar to the RJ45 crystal head, but has only 4 pins and is commonly used to connect phones and modems. It should be noted that RJ11 usually refers to a 6-position (6-pin) modular jack or plug, but only 4-pin is used. In addition, RJ11 is also used in the 4-pin version of the modular connector.

Advantages of RJ11 connectors

  

Low cost: RJ11 connectors are simple to make, with low material costs, suitable for large-scale applications, especially in home telephone systems and small office environments.

  

Easy to install: RJ11 connectors have a simple installation process and do not require complex tools to complete the connection, which is suitable for users to install and maintain on their own.

  

Strong compatibility: RJ11 is a widely used telephone line connector standard in the world, compatible with most of the telephone equipment and telephone systems, to ensure its universality.

  

Compact and lightweight: RJ11 connectors are compact, easy to plug and unplug, space-saving, and perfect for limited space wiring needs.

    

Wide range of applications: In addition to telephone systems, RJ11 connectors can also be used for certain modems and fax machine connections, a wide range of applications.

 

RJ45 vs RJ11, What's the Difference?

      

Construction

RJ45 crystal heads are connectors with 8 grooves and 8 contacts (8p8c), while RJ11 crystal heads usually have only 6 grooves and 4 contacts (6p4c), and are therefore larger than RJ11 crystal heads.RJ11 crystal heads can usually be inserted into RJ45 interfaces, and vice versa, but it is strongly recommended here that you do not use an RJ11 crystal head for an RJ45 interface.

          

Wire Sequence Standard

Due to the different construction of RJ45 crystal head and RJ11 crystal head, the wiring of its wiring standards are also different.RJ11 crystal head generally only 6 grooves and 4 contacts (6p4c), and its wiring sequence is fixed, as shown in the figure below:

There are two standards for wiring RJ45 crystal heads: T-568A and T-568B (details below). By adopting different standards, the final network cable is made into two types: straight-through type and crossover type. If you want to make a straight-through cable, both ends of the cable should be wired according to the same standard (T-568A or T-568B); if you want to make a crossover cable, both ends of the cable should be wired according to different standards.

   

Applications

RJ45 crystal heads are generally terminated at both ends of network cables to connect network devices such as computers, while RJ11 crystal heads are terminated at both ends of ADSL and voice cables to connect telephones or modems. Although the RJ11 crystal head can be inserted into the RJ45 interface, but the two do not work together, because the RJ11 crystal head is not an international standard, its size, insertion strength, insertion angle, etc. are not unified in accordance with international standards for the design of connectors, if forced to make it work together, it may damage the equipment RJ45 interface.