Cat6 and Cat6a look alike on a spool. The differences are in speed over distance, cable thickness and cost. Cable is the part of a network you live with longest, because it sits inside walls and ceilings, so it is worth settling before the walls are closed.
Short answer: Cat6 runs 1 Gbps to 100 meters, but 10 Gbps only up to about 55 meters. Cat6a runs 10 Gbps to the full 100 meters. Cat6 is enough for ordinary desk drops. Run Cat6a to access points, on long runs, and anywhere you would hate to pull cable again.
The real differences
| Cat6 | Cat6a | |
|---|---|---|
| Rated frequency | 250 MHz | 500 MHz |
| 1 Gbps distance | 100 m | 100 m |
| 10 Gbps distance | Up to about 55 m | 100 m |
| Cable | Thinner and easier to bend | Thicker, stiffer, larger bend radius |
| Cost | Lower | Higher |
The 100 meter limit is for the whole channel: up to 90 meters of permanent cable in the wall plus patch cords at each end.
Do you need 10 gigabit?
Most small offices do not today. The internet connection, file server and PCs are usually gigabit. Two things change the picture. Newer Wi-Fi access points often ship with 2.5 Gbps ports, and 2.5GBASE-T and 5GBASE-T are specified to reach 100 meters on Cat5e or better cabling, so Cat6 covers those speeds.
What justifies Cat6a is a 10 Gbps link, a run beyond 55 meters, or a wish not to redo the cabling when the equipment eventually moves to 10 Gbps.
Where we would use each
- Cat6 for desk and wall-plate drops, printers and general office runs under 55 meters where gigabit or 2.5 Gbps is plenty.
- Cat6a for access point and camera drops (they stay on that cable for years and often run on PoE, see PoE switches explained), links to the server rack, runs over 55 meters, and any run that will be hidden behind a finished ceiling.
Cable details that matter more than the category
- Solid copper only. Copper-clad aluminum (CCA) cable is cheaper, but the ANSI/TIA-568.2-D cabling standard requires copper, so CCA does not comply and can cause trouble with inspectors and insurers.
- Matching parts. Jacks and patch panels need the same rating as the cable. A Cat6a cable terminated on Cat6 jacks is a Cat6 link.
- Shielding. Shielded cable only performs as designed when it is terminated and grounded correctly. Ask your installer how they will do it.
- Testing. Have every run tested and keep the report. Label both ends of every cable.
- Slack and bend radius. Leave spare cable at each end and respect the bend radius, which is larger for Cat6a.
What about Cat5e?
Cat5e still does gigabit, and 2.5 and 5 Gbps over 100 meters. If good Cat5e is already in the walls, replacing it rarely pays for itself. For new runs we would not install anything below Cat6.
Planning a cabling job
- List every location that needs a drop: desks, access points, cameras, POS terminals, printers and phones.
- Add a spare drop at each location. A spare is cheap while the ceiling is open and expensive afterwards.
- Decide where the patch panel, switch and rack will sit, and how they will be powered (see the PoE guide above).
- Choose the category by the rules above and write it into the quote.
- Require testing, labeling and a drawing of where each cable goes.
Frequently asked questions
Can Cat6 handle 10 Gbps?
Only over short runs. Cat6 is limited to about 55 meters for 10GBASE-T, while Cat6a reaches the full 100 meters.
Is Cat6a worth the extra cost?
For access point drops, rack links and long runs, usually yes, because the cable outlasts the equipment. For ordinary desk drops under 55 meters, Cat6 is enough.
Is Cat6 enough for Wi-Fi 6?
For most setups, yes. A gigabit or 2.5 Gbps access point uplink works over Cat6 at full distance. If you plan for 10 Gbps uplinks, choose Cat6a.
Does PoE change the cable choice?
Higher-power PoE puts more current through the cable, so Cat6 or better gives more margin than Cat5e for Type 3 and Type 4 devices.
Getting an office or store cabled? Scandifix can plan the drops, coordinate the install and set up the switching and Wi-Fi behind it as part of a network setup. Call +1 (587) 400-9991 or contact us.