Structured cabling is the least glamorous part of a network and the hardest to change. Equipment cycles every five to seven years; the cable behind the drywall is often expected to last two or three equipment generations. Getting the choice right up front is one of the highest-leverage decisions in any build or refresh.
The quick comparison
| Cat6 | Cat6a | Fiber | |
|---|---|---|---|
| 10 Gb/s distance | Up to ~55 m, environment-dependent | Full 100 m channel | Hundreds of meters to many kilometers |
| Multi-gig (2.5/5 Gb/s) | Generally supported to 100 m | Supported to 100 m | N/A (uses optics) |
| PoE | Supported; more heat in large bundles | Better heat performance for high-power PoE | No power (needs separate power or hybrid cable) |
| Cost | Lowest | Higher cable and labor cost; bulkier | Higher for endpoints; cost-effective for backbone |
| Typical role | Desks, phones, cameras, light-duty APs | Wi-Fi 6E/7 APs, high-power PoE, long horizontal runs | Backbone, riser, building-to-building, data center |
Why access points change the math
Wi-Fi is now the main way most people connect, and access points are the most demanding devices on the cabling plant. Two trends matter:
- Multi-gigabit uplinks. Wi-Fi 6E and Wi-Fi 7 access points commonly ship with 2.5 Gb/s, 5 Gb/s, or even 10 Gb/s ports. A single 1 Gb/s link can become the bottleneck.
- More power. High-end access points can require more power than older PoE standards deliver. IEEE 802.3bt (PoE++) supports up to 90 W at the switch, and power in large cable bundles turns into heat. Cat6a's construction handles that heat better.
For that reason, many designers now run Cat6a to every access point location even when Cat6 is used elsewhere — and often pull two drops per AP location for future capacity.
Where fiber belongs
Fiber is the standard for anything that connects closets, floors, or buildings. It isn't affected by electrical interference, isn't limited to 100 m, and carries far more capacity than copper. Common choices:
- Multimode (OM3/OM4) for shorter backbone runs inside a building.
- Single-mode (OS2) for longer distances, campus links, and the most future capacity. Increasingly the default for new backbones because optics costs have come down.
Warehouses and large campuses often have horizontal distances beyond copper's 100 m limit, which makes fiber to intermediate closets (or hardened switches) a necessity rather than an upgrade.
Cost: look at the whole lifecycle
Cat6a costs more per foot and takes more labor to pull and terminate. But labor, ceiling access, and disruption make up most of a cabling project's cost — and you pay those again if you have to re-cable early. Spending a little more on the right cable now is usually far cheaper than a second project in five years.
Installation quality matters as much as category
A Cat6a cable installed badly performs worse than a Cat6 cable installed well. The things that separate a good install from a bad one:
- Testing and certification of every link with a calibrated certifier, with results delivered to you.
- Labeling and documentation that matches reality, so future moves and troubleshooting don't start with tracing cables by hand.
- Bend radius, support, and separation from power and sources of interference.
- Clean closets — managed patching, room for growth, proper grounding.
- Coordination with the wireless design, so drops land where the site survey says access points should go.
A sensible default for most commercial buildings
- Single-mode fiber backbone between MDF and IDFs, with spare strands.
- Cat6a to every Wi-Fi access point location (two drops where practical).
- Cat6 or Cat6a to work areas, cameras, and other endpoints depending on budget and expected life.
- Full certification test results and as-built documentation.
The bottom line
Choose cabling for the equipment you'll have in ten years, not the equipment you have today. And whatever you choose, insist on testing, certification, and documentation — that's what makes the investment last.