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How to crimp a shielded RJ45 connector step-by-step
Properly crimping an RJ45 connector 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 colour order, assembly steps, and the most common errors.
Required tools
- Compatible Ethernet cable: Cat6A, Cat7, Cat8, etc.
- RJ45 connectors suitable for the cable category and diameter — for shielded cable, FTP Cat6a/Cat7 connectors.
- RJ45 crimping tool compatible with shielded connectors.
- Wire stripper or precise cutting tool.
- Network tester to verify continuity and order.
- Optional protective boots.
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T568A or T568B: which colour order to use
The two most common standards are T568A and T568B. Many commercial installations use T568B, 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 to 3 cm of the outer jacket. Do this carefully to avoid damaging the internal pairs or the shielding mesh/foil. A wire stripper specific for UTP and STP adjusts the cutting depth and prevents precisely such damage.
2. Prepare the shielding
For FTP, STP, or S/FTP cables, separate the mesh or drain wire. The objective is for the shielding to make contact with the metal casing of the shielded RJ45 connector. If there is no continuity, some of the protection against interference is lost.
3. Arrange the wires
Choose T568A or T568B and align the wires. Keep the twist as close as possible to the connector to maintain cable performance. Connectors with an internal guide greatly simplify this step: the wires enter in order and reach the bottom without crossing.
4. Cut the wires to the same length
Once aligned, cut the tips so that they are straight and all fit to the bottom of the connector.
5. Insert the cable into the connector
Insert the wires respecting the order. Visually check that each wire reaches the end and that the outer jacket is held inside the connector or corresponding clamp.
6. Crimp with firm pressure
Place the connector in the RJ45 crimping tool and press firmly. For shielded connectors, verify that the metal part is securely attached to the shielding. If you are also installing wall plates or patch panels, you will need an impact punch-down tool.
7. Test with a tester
Do not consider the cable finished without testing it. A network tester helps you detect crossed wires, breaks, false contacts, or order errors.
Common errors when crimping RJ45
- Incorrect colour order: can cause connection loss or reduced speed.
- Pairs untwisted too much: increases interference and reduces performance.
- Incompatible connector with the cable: the conductor or jacket diameter may not fit.
- Poorly connected shielding: for shielded cables, this reduces EMI protection.
- Not using a tester: a cable may appear correctly 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. Many commercial installations use T568B.
Can I crimp Cat7 with a normal RJ45?
It depends on the cable and the connector. You must use connectors compatible with the category, thickness, and type of cable shielding: for shielded Cat6a and Cat7, you need RJ45 connectors for FTP Cat6a and Cat7.
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 may be a poorly connected wire, a damaged pair, an incorrect crimp, or low-quality connectors/cable. Verify it with a tester.
Can I fit an RJ45 without a crimping tool?
Yes. A tool-free RJ45 connector closes by hand: the wires are arranged in the guide and the cap locks them in when pressed. It is the practical choice for a single cable or a one-off repair where buying a crimping tool is not worth it, and it can be opened and refitted if you get the order wrong.
Conclusion
Crimping a shielded RJ45 requires precision: correct colour 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 equipment.
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