The cable category (CAT5e, CAT6, CAT6A) is the single biggest factor in an Ethernet cable's performance, but for most everyday networking it matters less than people assume. Here's what each rating actually changes, and where the other factors — length, shielding, and fire rating — come in.
Each category step up increases the maximum reliable speed and the bandwidth the cable is certified for, but the practical difference for a typical office or home network is smaller than the marketing suggests — CAT5e is still perfectly capable of gigabit speeds over standard cable runs.
| CAT5e | Up to 1 Gbps at 100m. Fine for most standard gigabit networks and everyday patch cables. |
| CAT6 | Up to 1 Gbps at 100m, or 10 Gbps at shorter runs (up to ~55m). The common choice for new installs today. |
| CAT6A | 10 Gbps at the full 100m, with better shielding against interference. Worth it for data centers, longer runs, or future-proofing. |
If you're patching a laptop or desktop to a switch or wall port a few meters away, CAT6 is a safe, inexpensive default that comfortably outperforms most home and office internet connections. If you're running 10-gigabit switches or storage over longer distances, CAT6A is worth the extra cost for the guaranteed full-length performance.
For short, everyday patch cables where flexibility and a tidy cable run matter more than raw bandwidth, a slim CAT6 cable is worth considering — same electrical performance, thinner and easier to route through tight spaces or cable trays.
This matters specifically for cable that runs through walls, ceilings, or air-handling spaces (plenums) rather than a simple desk-to-wall patch cable, and it's often a building code requirement, not just a preference.
Plenum-rated (CMP) cable is required for runs through air-handling spaces like drop ceilings used for HVAC, since it's designed to be less flammable and produce less toxic smoke if it does burn.
Riser-rated (CMR) cable is the standard requirement for vertical runs between floors in a building, and is less strict (and less expensive) than plenum-rated cable.
Standard, non-rated cable is fine for exposed desk-level connections that aren't running through walls or ceilings at all.
Premade patch cables (with connectors already attached) are the right choice for standard desk-to-switch connections. Bulk cable on a reel — sold by the foot, terminated on-site — makes sense for structured wiring runs through walls, custom lengths that don't match standard patch cable sizes, or larger installation projects where reel pricing works out cheaper than dozens of individual cables.
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