When we quote data cabling for a new office, medical suite or warehouse, one of the first questions is whether to run Cat6 or Cat6A. Both are common in Australian commercial buildings, both use the same RJ45 connectors, and both will run a normal office network. The differences are in speed over distance, how they handle heat and power, and what they cost to install. Here’s a plain explanation of each.
The short version
Cat6 is a solid choice for most small to medium offices with standard networking needs. It supports gigabit speeds comfortably over the full 90 metre permanent link and can support 10 gigabit over shorter runs.
Cat6A is built for 10 gigabit over the full link length. It has better shielding against interference between cables and generally handles higher-power PoE better in large bundles. It’s thicker, stiffer and takes more space in trays and cabinets, and installation takes more care.
If the building will be in use for many years and the network is likely to grow, Cat6A is often worth considering. If the tenancy is short-term or the network needs are modest, Cat6 usually does the job well.
Speed and distance
Structured cabling is designed around a maximum channel length of 100 metres, which is usually a permanent link of up to 90 metres plus patch leads at each end. Cat6 is rated for higher frequencies than older Cat5e cable and is well suited to gigabit networks at that length. It can run 10 gigabit, but only over a reduced distance, so it isn’t a reliable 10 gigabit solution across a whole floor.
Cat6A is rated to a higher frequency again and is designed to carry 10 gigabit over the full channel. For offices with large file transfers, video production, medical imaging, or switches uplinked across a floor, that extra headroom matters.
Power over Ethernet
Many devices now take their power from the data cable. Wireless access points, IP cameras, phones, access control readers and some lighting systems all use PoE. The higher the power, the more heat in the cable, and when cables are bundled together that heat builds up.
Cat6A cable typically has larger conductors and better heat performance, which helps when you have lots of PoE devices on long runs in tight bundles. That’s one of the reasons Cat6A is common for wireless access points and CCTV in larger sites. For a small office with a few access points, Cat6 is generally fine.
Installation differences
Cat6A is physically bigger. It takes up more room in cable trays, conduits and wall cavities, needs a larger bend radius, and makes comms cabinets fill up faster. Terminations need more care, especially with shielded cable, where the shield must be properly bonded.
These factors affect labour and materials, which is why Cat6A usually costs more to install than Cat6. The difference depends on the building, cable routes and the number of outlets, so we price each job on its own drawings rather than using a rule of thumb.
Planning ahead helps. Leaving enough space in trays and cabinets for Cat6A, and keeping cable routes clear of power cables and lighting, makes installation smoother and performance more reliable.
Testing and certification
Whichever category you choose, every link should be tested with a certification tester once it’s installed. The test confirms the link meets its category performance, not just that it’s connected. A link that passes a simple continuity test can still fail certification because of poor terminations, excess untwisting or damaged cable.
We test every link and provide the results at handover, along with labelling that matches the patch panel and outlet schedule. Cabling work in Australia must be done by a registered cabler, and we work to the relevant cabling rules and standards.
Which one should you choose?
Here’s how we usually guide clients:
- Small office or short-term lease: Cat6 is usually sensible and cost-effective.
- Growing business or longer lease: consider Cat6A for the backbone and key areas, or throughout if the budget allows.
- Heavy PoE use, many access points or cameras: Cat6A for those runs is often a good call.
- Medical, engineering, design or video work: Cat6A for workstations handling large files.
- New buildings designed to last: Cat6A is increasingly the default for base building and long-term owner-occupiers.
It’s also common to mix them. A site might use Cat6A for access points and uplinks and Cat6 for general desk outlets.
Coordinating data with the electrical
Data cabling runs in the same ceilings and walls as the power, so it makes sense to plan them together. Outlets need to line up, cable routes need separation from power cables, and the comms cabinet needs its own circuit. Running both with one contractor reduces clashes and gives you one set of as-built drawings. We cover this in our commercial fit-out electrical checklist.
Other things to consider
Cable choice is only part of a reliable network. Good rack layout, tidy patching, clear labelling and adequate ventilation for the comms cabinet all matter. Wireless access point placement should be planned for coverage, not just convenience. And if the site uses access control or CCTV, those systems can share the cabling infrastructure, which is something our security and access control team plans for at the same time.
Think about the life of the fit-out too. Replacing cabling after a ceiling is closed is disruptive and expensive. It’s usually better to put in slightly more capacity now than to try to add it later.
Getting a quote
Our data cabling service covers offices, retail, medical, industrial and multi-tenant buildings across the Gold Coast, Brisbane and Northern NSW. Send through your floor plan or outlet layout and we’ll give you an upfront written quote, with Cat6 and Cat6A options if you want to compare. It pairs well with our commercial fit-out work.
Safety note: electrical work in Queensland and NSW must be done by a licensed electrician. This article is general information, not advice for your specific property. If something looks or smells wrong, switch off at the main switch if it’s safe to do so and call an electrician.