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How to crimp a shielded RJ45 connector step-by-step
Crimping an RJ45 connector correctly is key to achieving a stable network. In installations with shielded cables like Cat6A, Cat7, or Cat8, in addition to the wire order, the continuity of the shielding must also be maintained to reduce interference.
In this guide, we explain the necessary tools, the T568A/T568B color code, assembly steps, and common mistakes.
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Required tools
- Compatible Ethernet cable: Cat6A, Cat7, Cat8, etc.
- RJ45 connectors suitable for the cable's category and diameter.
- RJ45 crimping tool compatible with shielded connectors.
- Wire strippers or precise cutting tool.
- Network tester to verify continuity and order.
- Optional protective boots.
T568A or T568B: which color code to use
The two most common standards are T568A and T568B. In many commercial installations, T568B is used, but the most important thing is to use the same standard at both ends of the cable.
| Pin | T568A | T568B |
|---|---|---|
| 1 | White/green | White/orange |
| 2 | Green | Orange |
| 3 | White/orange | White/green |
| 4 | Blue | Blue |
| 5 | White/blue | White/blue |
| 6 | Orange | Green |
| 7 | White/brown | White/brown |
| 8 | Brown | Brown |
Step-by-step guide to crimping a shielded RJ45
1. Cut and strip the cable
Cut the cable to the desired length and strip about 2 or 3 cm of the outer jacket. Do this carefully to avoid damaging the inner pairs or the shielding braid or foil.
2. Prepare the shielding
For FTP, STP, or S/FTP cables, separate the braid or drain wire. The goal is for the shielding to make contact with the metal casing of the shielded RJ45 connector. If there is no continuity, part of the protection against interference is lost.
3. Arrange the wires
Choose T568A or T568B and align the wires. Keep the twist as close to the connector as possible to maintain cable performance.
4. Cut the wires to the same length
Once aligned, cut the ends so they are straight and all can reach the bottom of the connector.
5. Insert the cable into the connector
Insert the wires according to the chosen order. Visually check that each wire reaches the end and that the outer jacket is secured inside the connector or corresponding strain relief.
6. Crimp with firm pressure
Place the connector in the crimping tool and press firmly. For shielded connectors, ensure that the metal part is securely fastened to the shielding.
7. Test with a network tester
Do not consider the cable finished without testing it. A network tester helps you detect crossed wires, breaks, loose contacts, or order errors.
Common mistakes when crimping RJ45
- Incorrect color order: can cause loss of connection or speed.
- Pairs too untwisted: increases interference and reduces performance.
- Incompatible connector with the cable: the conductor or jacket diameter may not fit.
- Poorly connected shielding: in shielded cables, this reduces EMI protection.
- Not using a tester: a cable may seem well-assembled but fail under real use.
Frequently asked questions
Which standard should I use, T568A or T568B?
Both are valid. The important thing is to use the same one at both ends. In many commercial installations, T568B is used.
Can I crimp Cat7 with a normal RJ45?
It depends on the cable and the connector. You must use connectors compatible with the cable's category, thickness, and shielding type.
Do I need a shielded connector for a shielded cable?
Yes, if you want to maintain the continuity of the shielding. Using an unshielded connector can reduce protection against interference.
Why does my cable only negotiate at 100 Mbps?
There could be a poorly connected wire, a damaged pair, an incorrect crimp, or low-quality connectors/cable. Verify with a tester.
Conclusion
Crimping a shielded RJ45 requires precision: correct color order, properly placed pairs, shielding continuity, and verification with a tester. If the installation is for a business, cameras, rack, or high-performance network, it is worth doing it with professional materials.
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