Cat6A Shielded: Two Constructions, One Bonding Rule
Quick answer / TL;DR: Short answer: choose F/UTP for moderate interference and easier installation, S/FTP for industrial sites with strong electromagnetic noise. Both need the shield bonded to a grounded panel with short drain wires. In a normal office, unshielded Cat6A performs identically and costs less to install.
One category, three axes: shielding, conductor and jacket create the SKU.Shielded Cat6A comes as overall foil (F/UTP) or foil per pair plus braid (S/FTP). Both reach 10G to 100 m; they differ in how much interference they reject and how stiff they are.
Either construction fails without bonding.
Construction Comparison
| Type | Shielding | Flexibility |
|---|
| F/UTP | Overall foil | Better |
| S/FTP | Pair foil plus braid | Stiffer |
| U/UTP | None | Best |
The stiffness difference matters in dense trays: S/FTP bend radius is larger and pulling tension must be lower.
Installation Rules
- Bond at the panel, not at both ends by default
- Keep drain wires under 50 mm
- Maintain bend radius
- Do not crush the foil with clips
- Test shield continuity per port
Crushed foil from a cable tie is a common defect that passes a continuity test and fails a noise test.
Real-World Applications
A hospital imaging suite uses S/FTP with a bonded panel. An office with standard IT loads uses U/UTP and passes 10G certification without any shielding.
Standards and Verification
| Reference | Relevance |
|---|
| ISO/IEC 11801 | Class EA |
| TIA-568.2-D | Bonding |
| IEC 60364 | Earthing |
Shield performance for a specific cable is not provided in the knowledge base. Require test data and check the bonding design.
References
- ISO/IEC 11801-1, Generic cabling
- TIA-568.2-D, Balanced Twisted-Pair Cabling
- IEC 60364 series, Low-voltage installations
Practical Notes
Photograph the bonded panel before closing. It is the evidence that the shielding was installed as designed.
Related reading: ethernet cable — blogs/news/ethernet-cable
Related reading: cat6a shielded cable — blogs/news/cat6a-shielded-cable
Related reading: cat6a ethernet cable guide — blogs/news/cat6a-ethernet-cable-guide
Frequently Asked Questions
F/UTP or S/FTP?
F/UTP for moderate noise, S/FTP for industrial.
Does shielding change speed?
No. Both reach 10G to 100 m.
Do I need shielded in an office?
Usually not.
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