Cat Cable Types | Which Ethernet Category You Actually Need

Ethernet cables are categorized by TIA/EIA and ISO/IEC standards into Cat5e, Cat6, Cat6a, Cat7, Cat7a, and Cat8, with each category defining bandwidth, maximum data rate, shielding, and maximum length for that speed.

Not every Ethernet cable works the same way. The category — or “Cat” rating — stamped on the jacket tells you exactly what speeds and distances the cable supports. Cat5e is fine for basic internet plans, while Cat8 exists for data center backbones that most homes will never touch. Here is what each category actually delivers, where it makes sense, and the one spec people get wrong most often.

What Do Cat Cable Categories Mean?

Cat stands for Category, a set of performance standards defined by the TIA/EIA and ISO/IEC organizations. Each category specifies a maximum bandwidth in megahertz and a maximum data rate in gigabits per second, along with how the cable must be built to control crosstalk and noise. Higher categories do not mean “better in every way” — they mean “designed for a tighter spec that may require different connectors or shorter runs.”

The TIA/EIA-568 standard governs the categories used in the US. Cat6 was introduced in 2002, and Cat8 was standardized in 2016 under IEEE 802.3bq. Cat5 and lower are now obsolete.

Cat5e vs. Cat6 vs. Cat6a vs. Cat7 vs. Cat8: The Key Differences

The table below compares every current category across the specs that matter most for a buying decision: bandwidth, maximum speed at 100 meters, maximum speed at short distances, and whether shielding is required.

Cat6 does 10 gigabit only up to 55 meters — beyond that, it drops to 1 Gbps. That is the single most common misunderstanding. If you need 10 GbE across a full 100-meter run, you need Cat6a, not Cat6.

Which Cat Cable Should You Buy?

For most US homes with internet plans up to 1 gigabit, Cat5e or Cat6 is all you need. Cat6 costs roughly $0.08–$0.15 per foot (about $20–$35 for a 100-foot cable) and handles future 10-gigabit plans on runs shorter than 55 meters. If you are building a home network with 10-gigabit switches and need full 100-meter coverage, step up to Cat6a at $0.12–$0.20 per foot. Cat7 is an ISO-only standard not recognized by TIA; it often ships with non-standard GG45 or TERA connectors, making it an awkward choice for US setups that expect standard RJ45. If you are ready to pick the right cable for your network, see our tested roundup of the best Cat cables for specific brand and model recommendations.

Cat6e is not a real standard. It is a marketing term with no TIA or ISO specification. Avoid it entirely.

How to Verify a Real Cat Cable

A legitimate cable prints the category, bandwidth in MHz, and manufacturer name directly on the jacket. Look for UL Certified or ETL Verified marks, which confirm the cable meets TIA/EIA-568 compliance tests. Excessively cheap cables often skip certification and may fail crosstalk requirements. Eaton offers certified options like its Cat6a Shielded model (EAT-ETH-C6A-SH) for environments near power lines where foil shielding matters. For a full guide on certification and testing, consult Eaton’s Ethernet cable explained page.