For most new buildings the answer is a mix: Cat 6A for wireless access points and anything that needs 10 gigabit or high-power PoE, Cat 6 where budget is tight and needs are modest, and fibre for backbones between telecom rooms and buildings. The differences come down to bandwidth, distance, power delivery, cable size and cost.
The quick comparison
| Factor | Cat 6 | Cat 6A | Fibre |
|---|---|---|---|
| Rated bandwidth | 250 MHz | 500 MHz | Not comparable; far higher capacity |
| 10 gigabit Ethernet | Only on shorter runs | Full 100 m channel | Yes, over much longer distances |
| Carries PoE | Yes | Yes, and runs cooler under load | No |
| Cable size | Smaller | Larger and stiffer | Small |
| Typical use | Desk drops, phones, general devices | Access points, high-speed links, long-life installs | Backbones, between buildings, data centres |
Cat 6
Cat 6 handles gigabit Ethernet to 100 metres and is the economical choice for desk outlets, phones, printers and cameras. It can also carry 2.5 and 5 gigabit multi-gigabit Ethernet in many installations. It supports 10 gigabit only over shorter distances and in favourable conditions, because of crosstalk from neighbouring cables (alien crosstalk). If you do not expect a device to need more than gigabit over the life of the cabling, Cat 6 is reasonable.
Cat 6A
Cat 6A is designed to carry 10 gigabit Ethernet across the full 100 metre channel. It has better shielding against alien crosstalk and usually uses heavier conductors. Two practical advantages follow:
- Access points. Current and next-generation WiFi access points use 2.5, 5 or 10 gigabit uplinks and draw substantial PoE power. Industry guidance commonly recommends Cat 6A for access point drops.
- PoE heat. Larger conductors and construction mean Cat 6A generally runs cooler in bundles carrying high-power PoE. See Power over Ethernet (PoE).
The downsides are cost, a larger outside diameter, a larger bend radius, and heavier bundles that fill trays and conduits faster. Pathways need to be sized for it, and terminating Cat 6A takes more care and time than Cat 6, which shows up in labour cost.
Shielded or unshielded?
Cat 6A comes in unshielded (U/UTP) and shielded (F/UTP and similar) versions. Shielded cable can help in electrically noisy environments and makes for slimmer cable, but the shield must be bonded correctly at the panel end, and every component must be shielded. Unshielded is simpler to install. Both work when installed properly; pick one system and follow the manufacturer's instructions.
Fibre
Fibre carries light rather than electrical signals, so it is immune to electrical interference, does not carry lightning or ground potential between buildings, and supports very high speeds over long distances.
- Multimode fibre (OM3, OM4, OM5) is used inside buildings and data centres over shorter distances, with lower-cost optics.
- Singlemode fibre (OS2) reaches much further and has effectively unlimited bandwidth for building purposes. It is the usual choice between buildings, and many designers now use it for new backbones because it will support future speeds.
Fibre cannot power devices. Where fibre runs to a remote device, local power or a hybrid cable is needed. Fibre connectors must also be kept clean; a dirty end face is one of the most common causes of fibre link problems.
Cable is the long-lived part. Switches and access points are replaced every few years; cabling often stays for decades. The extra cost of Cat 6A or spare fibre strands is small compared with pulling new cable through a finished, occupied building.
A practical selection guide
- Access points: Cat 6A, often two drops per location
- Desk and wall outlets: Cat 6, or Cat 6A where budget allows
- Security cameras and access control: Cat 6 is usually enough; Cat 6A for heated or high-power outdoor units
- Backbone between telecom rooms: fibre, with spare strands
- Between buildings: singlemode fibre, rated for outdoor or underground use
- Data centre: fibre and Cat 6A according to equipment needs
Whatever you choose, every component in a link must be rated to the same category, and every link must be tested. See structured cabling standards.
How ehZee can help
Our structured cabling design and build service starts by asking what the building needs to support now and later, then selects cable types, pathways and rooms to match, and tests every link before handover.
Common questions
Is Cat 7 or Cat 8 worth considering?
Cat 8 is aimed at short links inside data centres. Cat 7 is not a recognized category in the North American TIA standards. For building cabling, Cat 6A and fibre are the practical choices.
Can we mix Cat 6A cable with Cat 6 jacks?
You can physically, but the link will only perform to Cat 6. Use matching components from one system so the link tests and is warrantied at the category you paid for.