Modular Jack

A modular jack, commonly referred to as an RJ (Registered Jack) connector, is a type of electrical connector that is widely used for various communication applications. It’s most commonly associated with telephone systems but is also used for networking with Ethernet cables. Here’s a closer look at modular jacks and their features.

What is a Modular Jack?

  • Definition: A modular jack is a socket that accepts modular plugs, typically used for connecting telephone and network cables.
  • Standards: The most common types are RJ11, RJ45, and RJ12, with RJ45 being the standard for Ethernet connections.


  • Telephony: Originally designed for telephone lines, modular jacks are used to connect landline phones.
  • Networking: RJ45 modular jacks are extensively used in computer networks for Ethernet connections.
  • Audio: In some cases, modular jacks can also be used for audio connections.

Key Features

  • Connector Type: Comes in various sizes and pin configurations to suit different applications.
  • Ease of Use: Easy to plug and unplug, which makes it convenient for users.
  • Compatibility: Designed to be compatible with a wide range of devices and cables.


  • Wall Plates: Modular jacks are often installed in wall plates for a clean and professional finish.
  • Surface Mount: Can be mounted on surfaces for easy access and visibility.
  • Keystone Jacks: For high-density installations, keystone jacks can be inserted into patch panels or wall outlets.

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