Ethernet Cable Categories — Cat3 to Cat8
Every twisted-pair category side by side, per ANSI/TIA-568.2-D · ISO/IEC 11801: specified bandwidth, the IEEE data rate each carries at distance, recognition status (the column that settles arguments), ISO class, required connector, and typical shielding. Category recognition and channel lengths are voluntary-standard values (TIA/ISO); the rates are IEEE 802.3 interoperability specs.
Category comparison
| Category | Bandwidth | Rate @ 100 m | Short-reach | TIA status | ISO class | Connector | Shielding |
|---|---|---|---|---|---|---|---|
| Cat3 | 16 MHz | 10 Mbps (10BASE-T) | — | Legacy (voice-class) | Class C | RJ45 (8P8C) | U/UTP |
| Cat5e | 100 MHz | 1 Gbps (1000BASE-T) · 2.5 Gbps (2.5GBASE-T) | — | Recognized | Class D | RJ45 (8P8C) | U/UTP typical |
| Cat6 | 250 MHz | 1 Gbps · 2.5 / 5 Gbps (802.3bz) | 10 Gbps to 37 m (55 m favorable) | Recognized | Class E | RJ45 (8P8C) | U/UTP typical, F/UTP available |
| Cat6A | 500 MHz | 10 Gbps (10GBASE-T) | — | Recognized | Class EA | RJ45 (8P8C) | U/UTP or F/UTP (both common) |
| Cat7 | 600 MHz | 10 Gbps | — | Never recognized | Class F | GG45 / ARJ45 / TERA | S/FTP or F/FTP (always shielded) |
| Cat7A | 1000 MHz | 10 Gbps | — | Never recognized | Class FA | GG45 / ARJ45 / TERA | S/FTP (always shielded) |
| Cat8 | 2000 MHz | — | 25 / 40 Gbps to 30 m, max 2 connectors | Recognized | Class I (8.1) / Class II (8.2) | RJ45 (TIA / ISO 8.1); TERA/GG45 (ISO 8.2) | F/FTP or S/FTP (no UTP exists) |
How to read the TIA status column
The recognition column is where most spec disputes live. Recognized means the category exists in ANSI/TIA-568.2-D and a field tester can certify to it. Never recognized — Cat7 and Cat7A — means the category only ever existed as ISO/IEC Class F/FA; TIA skipped from 6A to 8. That matters in practice: “Cat7” sold with RJ45 connectors cannot be a compliant Class F channel (Class F requires GG45/ARJ45/TERA), so specifying it buys shielded construction but no certifiable category. For U.S. commercial work the recognized ladder is Cat5e → Cat6 → Cat6A → Cat8, and new horizontal pulls land on Cat6 or Cat6A.
The in-between speeds — 2.5G and 5G
IEEE 802.3bz (2.5GBASE-T and 5GBASE-T) exists precisely to squeeze more out of the installed base: 2.5 Gbps runs on Cat5e to 100 m, and 5 Gbps runs on Cat6 to 100 m (5 Gbps on Cat5e works in many but not all plants — it is defined for limited use cases, not guaranteed). This is why Wi-Fi 6/6E access points with multi-gig uplinks often ride existing Cat5e/Cat6 rather than forcing a re-pull. Pair this chart with the distance rules and the shielding designators when writing a spec.
Common questions
What is the difference between Cat5e and Cat6?
Bandwidth and headroom. Cat5e is specified to 100 MHz and carries 1 Gbps (plus 2.5 Gbps under IEEE 802.3bz) to the full 100 m. Cat6 is specified to 250 MHz with tighter crosstalk limits — it carries 1, 2.5, and 5 Gbps to 100 m, and 10 Gbps only to 37 m (up to 55 m in a favorable alien-crosstalk environment). For any new commercial pull where 10 Gbps matters, the answer is Cat6A, which carries 10GBASE-T the full 100 m.
Is Cat7 a real standard?
Not in the TIA world. Cat7 (Class F) and Cat7A (Class FA) exist only in ISO/IEC 11801 — TIA never recognized them, and skipped from Cat6A straight to Cat8. True Class F also requires GG45, ARJ45, or TERA connectors, not RJ45, so most consumer "Cat7" patch cords with RJ45 plugs are not compliant Class F channels — they are shielded cables tested to no TIA category. For a spec-able U.S. install above Cat6A, the recognized options are Cat6A or Cat8.
How fast is Cat8?
Cat8 is specified to 2,000 MHz and carries 25GBASE-T and 40GBASE-T — but only over a 30 m channel with at most 2 connectors, which is why it is a data-center/equipment-room cable, not a horizontal-cabling category. TIA recognizes Cat8 as a single RJ45-based category; the Cat8.1/Cat8.2 split (Class I/II, with TERA-style connectors on 8.2) is ISO/IEC only.
Is Cat6e a real category?
No. "Cat6e" is a marketing label with no standard behind it — neither TIA-568 nor ISO/IEC 11801 defines it, each manufacturer sets its own limits, and a field tester cannot certify to it. A cable sold as Cat6e certifies as Cat6 or Cat6A, whichever it actually passes.
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