An Ethernet connector, specifically the RJ45 (Registered Jack 45) connector, is widely used for terminating Ethernet cables. Building an Ethernet connector involves carefully wiring the cable’s twisted pairs to the connector pins in the correct sequence. Here’s a step-by-step guide on making an Ethernet connector, along with examples:

Tools and Materials Needed:

  • Ethernet cable
  • RJ45 connectors
  • Crimping tool
  • Wire stripper/cutter

Step 1: Prepare the Cable

  • Start by stripping approximately 1.5 inches (4 cm) of the outer jacket from the end of the Ethernet cable.
  • Untwist and arrange the four twisted pairs of wires (orange, green, blue, brown) in the required order based on the wiring standard you’re following (T568A or T568B).

Step 2: Trim the Wires

  • Using a wire stripper or cutter, trim the wires so they are of equal length and align neatly.

Step 3: Insert Wires into the Connector

  • Hold the RJ45 connector with the pins facing upward and the tab facing away from you.
  • Insert the wires into the connector in the correct order, ensuring they pass through the connector’s strain relief and reach the end of the connector.
  • Ensure that each wire is fully inserted into its corresponding slot and that the wires maintain their assigned order.

Step 4: Check Wire Sequence

  • Double-check the wire sequence to ensure it matches the wiring standard you are using (T568A or T568B). Here are the color codes for both standards:

    T568A: Pin 1: White/Green Pin 2: Green Pin 3: White/Orange Pin 4: Blue Pin 5: White/Blue Pin 6: Orange Pin 7: White/Brown Pin 8: Brown

    T568B: Pin 1: White/Orange Pin 2: Orange Pin 3: White/Green Pin 4: Blue Pin 5: White/Blue Pin 6: Green Pin 7: White/Brown Pin 8: Brown

Step 5: Crimp the Connector

  • Insert the connector with the wires into the crimping tool, ensuring it is positioned correctly.
  • Apply pressure to the crimping tool to crimp the connector onto the wires, ensuring a secure connection.
  • Release the crimping tool and remove the terminated Ethernet connector.


  • T568A and T568B are two common wiring standards used for Ethernet connections. Let’s take T568B as an example for wiring an Ethernet connector:

    Pin 1: White/Orange Pin 2: Orange Pin 3: White/Green Pin 4: Blue Pin 5: White/Blue Pin 6: Green Pin 7: White/Brown Pin 8: Brown

  • Repeat the steps above for the other end of the Ethernet cable, ensuring consistency in the wiring standard used.

Note: It is important to maintain consistency in the wiring standard used for both ends of the Ethernet cable to ensure proper communication between devices.

By following these steps and adhering to the appropriate wiring standard (T568A or T568B), you can successfully create an Ethernet connector for terminating Ethernet cables. Remember to test the connectivity and functionality of the cable after crimping the connectors to ensure a reliable Ethernet connection.