Can Cat6 run 10 Gbps?
Cat6 can run 10GBASE-T only over short channels, about 55 m at most. TIA guidance for installed Cat6 puts the supported length between 37 m and 55 m, depending on alien crosstalk, which is interference from neighboring cables in a bundle. Beyond that, the link may need mitigation or may not work.
Cat6A removes that uncertainty. It is specified to 500 MHz with controlled alien crosstalk, so 10GBASE-T works over the full 100 m channel. If an installed Cat6 link must carry 10 Gbps, test it first, because the result depends on length and cable layout.
How do cable size and shielding affect the install?
Cat6A is usually larger than Cat6, so it takes more room in trays, conduit and cabinets. Minimum bend radius is a multiple of cable diameter, often four times for unshielded horizontal cable and higher for some constructions. A bigger cable therefore needs a wider bend in absolute terms. Always follow the datasheet for the exact product.
Shielded Cat6A, such as foil or screened designs, can reduce alien crosstalk and external noise, but it must be bonded and grounded correctly. Poor grounding can cause problems that unshielded cable avoids. Shielding is a design decision for noisy environments, not an automatic upgrade.
Does PoE change the choice between Cat6 and Cat6A?
Yes, high-power PoE favors Cat6A. Power over all four pairs, as in IEEE 802.3bt, heats the cable, and heat rises faster in large bundles. TIA TSB-184-A covers this, supporting up to 100 W over four pairs, advising small bundles of 24 cables or fewer where possible, and recommending Cat6A or better for new PoE installations.
Cat6 still works for low-power PoE and many installs. If you plan many high-power devices on shared pathways, Cat6A gives more thermal margin.
The verdict
For new buildings and any run that might need 10 Gbps or heavy PoE, Cat6A is the safer choice because it removes the length and heat questions. Cat6 remains a sound choice for short runs, 1 Gbps devices and tight budgets or pathways. If you are unsure, certify a sample of runs and plan from the results.