Creating custom-length Ethernet cables is a fundamental skill for any professional installer, network enthusiast, or dedicated DIYer. It allows you to build a clean, efficient, and perfectly tailored network infrastructure, eliminating messy excess cabling and ensuring optimal performance. As a leading manufacturer of high-quality network cables since 2009, we at D-Lay Cable have seen firsthand how the right materials and techniques make all the difference.
This comprehensive guide will walk you through the professional method for connecting, or “terminating,” Cat6 cable ends with RJ45 connectors. We’ll cover everything from the necessary tools to the critical wiring standards and pro tips to guarantee a reliable, high-speed connection every time.
Article Contents
Essential Tools and Materials You’ll Need
Having the right tools is non-negotiable for a clean, successful termination. Using improper tools can damage the delicate wires or result in a poor connection that will plague your network with intermittent issues.
- High-Quality Cat6 Bulk Cable: The foundation of your network. For best performance and signal integrity, we recommend using a cable with 100% bare copper conductors, like the certified cables we manufacture at D-Lay Cable.
- Cat6 RJ45 Connectors: Ensure your connectors are specifically rated for Cat6. They have staggered internal channels to accommodate the thicker wires and reduce crosstalk. They can be standard or pass-through style.
- Crimping Tool: This tool performs the most critical action: it securely fastens the RJ45 connector to the cable and pushes the pins into the wires. A good crimper will also have a built-in wire cutter.
- Cable Stripper or Cutters: A dedicated cable jacket stripper is best to avoid nicking the internal wires. Many crimping tools have a stripper built-in.
- Network Cable Tester: This is the only way to be 100% certain your cable is wired correctly and can transmit data. It tests for continuity, shorts, and mis-wires.
The Key: Understanding T568A vs. T568B Wiring
Inside a Cat6 cable are 8 wires, organized into 4 twisted pairs. To connect them, you must follow a specific color-coded standard. The two standards are T568A and T568B. While both work, T568B is the most common standard used in modern networks in North America and globally.
For a standard “straight-through” patch cable (used to connect a computer to a switch, router, or wall plate), you must use the same standard on both ends.
T568B Wiring Order (Most Common)
When looking at the RJ45 connector with the clip facing away from you, the wire order from left to right (Pin 1 to Pin 8) is:
- Orange/White
- Orange
- Green/White
- Blue
- Blue/White
- Green
- Brown/White
- Brown
T568A Wiring Order
The T568A standard simply swaps the Orange and Green pairs. The order is:
- Green/White
- Green
- Orange/White
- Blue
- Blue/White
- Orange
- Brown/White
- Brown
Pro Tip: Unless you have a specific reason to use T568A (like matching existing infrastructure), stick with T568B for all your new cables to maintain consistency.
Step-by-Step Guide to Connecting Cat6 Ends
With your tools and knowledge of the T568B standard, you’re ready to begin. Follow these steps carefully.
Step 1: Strip the Outer Jacket
Using your cable stripper, carefully score and remove about 1 inch (2.5 cm) of the outer cable jacket. Be gentle to avoid cutting or nicking the twisted pairs inside. Once scored, the jacket should pull off easily.
Step 2: Prepare the Wires
You will now see the 4 twisted pairs and possibly a plastic spline (a cross-shaped divider that reduces crosstalk in Cat6 cables).
– Snip off the central spline, the rip cord, and any clear plastic wrapping as close to the jacket as possible.
– Untwist each of the four pairs and begin to straighten out all 8 individual wires. Try to get them as straight and parallel as you can.
Step 3: Arrange Wires in T568B Order
This is the most crucial step. Carefully arrange the straightened wires side-by-side in the T568B color order:
Orange/White, Orange, Green/White, Blue, Blue/White, Green, Brown/White, Brown.
Pinch the wires tightly together between your thumb and forefinger to keep them flat and in the correct order.
Step 4: Trim the Wires
While still pinching the wires flat, use the cutter on your crimping tool to make a single, clean, straight cut across all 8 wires. You should be left with about 1/2 inch (1.25 cm) of exposed wires from the edge of the jacket. A straight, even cut is essential for all wires to make proper contact inside the connector.
Step 5: Insert Wires into the RJ45 Connector
Hold the RJ45 connector with the clip facing down. Carefully and gently slide the flat row of wires into the connector. Push until the wires reach the very end of the connector. You should also be able to see the outer cable jacket pushed snugly inside the rear of the connector, which provides strain relief.
Double-check the wire order by looking through the transparent top of the connector before you crimp.
Step 6: Crimp the Connector
Insert the RJ45 connector into the appropriate slot on your crimping tool. Squeeze the handles firmly and completely. You should hear a “crunch” as the tool pushes the gold-plated pins down through the wire insulation, making a solid connection. It will also secure the cable jacket at the base of the connector.
Step 7: Repeat on the Other End
Now, simply repeat the exact same process (Steps 1-6) on the other end of the cable, ensuring you use the same T568B standard for a straight-through cable.
The Final, Crucial Step: Testing Your Cable
Never assume your cable is perfect. A simple mistake is easy to make. Plug both ends of your newly terminated cable into a network cable tester. A good tester will light up 8 LEDs in sequence on both the main and remote units, confirming that every pin is correctly connected. If any light is out of order, dim, or off, you have an issue that needs fixing (see troubleshooting below).
Pro Tips from the Cable Experts at D-Lay
- Quality Starts with the Cable: Using cheap Copper Clad Aluminum (CCA) cable can lead to failed terminations and poor signal quality. Always insist on 100% bare copper Cat6 cable for reliable performance and PoE (Power over Ethernet) safety.
- Minimize Untwisting: The twists in the pairs are essential for preventing signal interference. Only untwist as much as you need to get the wires into the connector—ideally, the twists should continue right up to the back of the RJ45 plug.
- The Push-Pull Check: Before crimping, push the wires in, then gently pull back on the cable jacket to ensure it’s seated firmly against the back of the connector for proper strain relief.
- Use Pass-Through Connectors: If you are new to this, consider using pass-through RJ45 connectors. They allow the wires to pass all the way through the front of the connector, letting you verify the order 100% before you trim and crimp in one motion.
Troubleshooting Common Termination Issues
If your cable tester shows a failure, it’s almost always one of these issues:
- Incorrect Wire Order: The most common mistake. Cut off the connector and start again, paying close attention to the T568B color code.
- Wires Not Fully Seated: One or more wires didn’t reach the end of the connector. Trim the wires more evenly and re-insert before crimping a new plug.
- Poor Crimp: The crimp wasn’t firm enough, and the pins didn’t pierce the wires. Use a new connector and apply firm, even pressure.
- Jacket Not Secured: If the cable jacket isn’t inside the connector when crimped, there is no strain relief, and the cable will fail quickly with movement.
Your Partner in Network Excellence
Congratulations! You now have the knowledge and a step-by-step process to create professional, reliable Cat6 network cables. By mastering this skill, you take full control of your network’s physical layer, ensuring a stable and high-speed foundation for all your data needs.
At D-Lay Cable, we are more than just a manufacturer; we are your partners in building superior networks. For your next project, trust in our ISO, UL, and CE certified Cat6 bulk cables to provide the quality and performance your infrastructure demands. Explore our range of networking solutions at www.dlaycable.com or contact our team for your OEM/ODM needs.