Cat5e vs Cat6 vs Cat6A: Speed, Distance and Which to Choose
Cat5e, Cat6 and Cat6A are the three twisted-pair categories used in almost every new structured cabling project. They look alike, use the same RJ45 connector and share the same 100 m channel limit, but they differ in bandwidth, the speeds they support over distance, size and cost. This guide compares them side by side and explains which one to choose.
Quick answer
- Cat5e: fine for 1 Gbit/s links and small or temporary networks; the lowest cost.
- Cat6: the usual choice for new office, CCTV and Wi-Fi installations at 1 Gbit/s, with headroom for 2.5 and 5 Gbit/s.
- Cat6A: the choice for 10 Gbit/s over the full 100 m, high-power PoE, Wi-Fi 6/6E/7 access points and data centres.
Cat5e vs Cat6 vs Cat6A at a glance
| Cat5e | Cat6 | Cat6A | |
|---|---|---|---|
| Rated bandwidth | 100 MHz | 250 MHz | 500 MHz |
| 1 Gbit/s (1000BASE-T) | 100 m | 100 m | 100 m |
| 2.5 / 5 Gbit/s (802.3bz) | 2.5G to 100 m | 2.5G and 5G to 100 m | 2.5G and 5G to 100 m |
| 10 Gbit/s (10GBASE-T) | Not specified | Up to about 55 m | 100 m |
| Typical conductor | 24 AWG | 23 or 24 AWG | 23 AWG |
| Common constructions | U/UTP, F/UTP | U/UTP, F/UTP, U/FTP, S/FTP | U/UTP, F/UTP, U/FTP, S/FTP |
| Relative size and cost | Smallest, lowest | Medium | Largest, highest |
All three categories are limited to a 100 m channel: up to 90 m of solid installation cable plus up to 10 m of patch cords.
Speed and distance explained
Bandwidth, measured in MHz, is the frequency range a cable is tested to. More bandwidth gives more headroom against noise and crosstalk, which is what allows higher data rates. Cat5e at 100 MHz carries Gigabit Ethernet comfortably and, under IEEE 802.3bz, 2.5 Gbit/s over 100 m. Cat6 at 250 MHz adds 5 Gbit/s over 100 m and can run 10GBASE-T over shorter links, typically up to about 55 m depending on the installation and alien crosstalk. Cat6A at 500 MHz is the first category specified for 10 Gbit/s over the full 100 m channel.
For a deeper look at Cat6A see Cat6A cable speed, maximum length and diameter.
Shielding: U/UTP, F/UTP and S/FTP
Each category is made in unshielded and screened versions. U/UTP has no screen and is the most common for offices. F/UTP adds an overall foil around the four pairs. U/FTP screens each pair individually, and S/FTP adds an overall braid as well. Screened cable is chosen near strong electrical noise, in industrial sites, for long parallel runs in busy containment, or where the specification calls for it. A screened system needs screened connectors and correct earthing throughout.
PoE and heat
Power over Ethernet sends power and data on the same cable. Higher-power PoE (IEEE 802.3bt, up to 90 W at the switch) warms the cable, and bundles get warmer still. Larger conductors have lower resistance, so 23 AWG Cat6 and Cat6A run cooler and lose less power than 24 AWG cable. For PoE cameras and access points on long runs, 23 AWG cable is the safer choice.
Which category should you choose?
- Offices and general LAN: Cat6 U/UTP covers today’s 1 Gbit/s desks with room for growth. Choose Cat6A where the building is expected to stay cabled for 15 years or more.
- CCTV and access control: Cat6 with 23 AWG conductors suits PoE cameras; use PE-jacketed outdoor cable for external runs.
- Wi-Fi 6, 6E and 7 access points: these use 2.5, 5 or 10 Gbit/s uplinks and higher PoE classes, so Cat6A is recommended.
- Data centres and server rooms: Cat6A, usually screened, for 10GBASE-T.
- Repairs and short extensions: Cat5e is acceptable where the rest of the link is Cat5e.
Cat6 vs Cat6A: cost and size
Cat6A cable is thicker and heavier than Cat6, so it fills containment faster, needs a larger bend radius and costs more per metre and to install. In return it supports 10 Gbit/s over 100 m and handles high-power PoE better. When the uplink speed or the life of the installation justifies it, Cat6A is the better long-term choice; otherwise Cat6 is the practical standard.
FAQ
What is the difference between Cat5e and Cat6?
Cat6 is tested to 250 MHz against 100 MHz for Cat5e, with tighter crosstalk limits. Both carry 1 Gbit/s over 100 m, but Cat6 adds 5 Gbit/s over 100 m and short-reach 10 Gbit/s.
Is Cat6A faster than Cat6?
Cat6A supports 10 Gbit/s over the full 100 m channel. Cat6 reaches 10 Gbit/s only over shorter runs, typically up to about 55 m.
Can I mix Cat5e, Cat6 and Cat6A in one link?
Yes, they are compatible, but a link only performs to its lowest-rated component, including connectors and patch cords.
Do Cat6 and Cat6A use different RJ45 connectors?
All use RJ45 (8P8C) connectors, but Cat6 and Cat6A plugs and keystone jacks are made for thicker conductors and tighter crosstalk control. Use connectors rated for the cable category. See RJ45 connectors and keystone jacks.
Is Cat6 still worth installing?
Yes. For most offices, CCTV and 1 Gbit/s networks Cat6 remains the best value. Choose Cat6A where 10 Gbit/s, Wi-Fi 6E/7 or long service life matters.
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Cat5e network cables · Cat6 network cables · Cat6A network cables · all Ethernet and network cables. Our technical support team can help confirm the right category for your project.