Ethernet Category Ladder: Five Steps, One Decision
Quick answer / TL;DR: Short answer: Cat5 handles 100 Mbps, Cat5e handles 1G to 100 m, Cat6 handles 10G to 55 m, Cat6A handles 10G to 100 m and Cat7 adds shielding without extending reach. For a new installation today, Cat6A is the sensible floor; Cat5e is acceptable only for 1G links that will never be upgraded.
One category, three axes: shielding, conductor and jacket create the SKU.Each Ethernet category adds bandwidth, and bandwidth translates into speed at distance. The confusion comes from categories that sound newer but are not.
This is the whole ladder in one table, with the decision each step implies.
The Ladder
| Category | Bandwidth | Typical speed | Distance |
|---|
| Cat5 | 100 MHz | 100 Mbps | 100 m |
| Cat5e | 100 MHz | 1G | 100 m |
| Cat6 | 250 MHz | 10G | 55 m |
| Cat6A | 500 MHz | 10G | 100 m |
| Cat7 | 600 MHz | 10G | 100 m |
Cat5e and Cat6 share a nominal 100 MHz headline in some documents; the difference is in crosstalk performance that allows higher signalling rates.
Upgrade Decisions
- Cat5 in place and working at 100 Mbps: leave it until the link is rebuilt
- Cat5e with 1G service: adequate, no urgency
- Cat6 for 10G only if every run is under 55 m
- Cat6A where 10G must reach 100 m
- Cat7 only against a written specification
The distance condition is what people miss: a Cat6 installation with one 70 m run will not deliver 10G on that run.
Real-World Applications
A home with 1G service and 30 m runs is fully served by Cat5e. An office planning 10G to the desk needs Cat6A, because a single long run otherwise caps the whole floor's promise.
Standards and Verification
| Reference | Relevance |
|---|
| TIA-568.2-D | Category specifications |
| ISO/IEC 11801 | Classes D to F |
| IEEE 802.3 | Speed by PHY |
Whether an installed link meets its category is not provided in the knowledge base. Certify the link with a field tester.
Practical Notes
Record every run length at installation. It is the number that decides whether 10G is available later.
Related reading: ethernet cable — blogs/news/ethernet-cable
Related reading: white ethernet cable — blogs/news/white-ethernet-cable
Related reading: weatherproof ethernet cable — blogs/news/weatherproof-ethernet-cable
Frequently Asked Questions
Is Cat5 still usable?
For 100 Mbps links, yes.
Can Cat6 do 10G?
Only up to 55 m.
What should a new build use?
Cat6A as the baseline.
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