If you’re fitting out a new office, upgrading your network, or installing security cameras and wireless access points, you’ll hit this question pretty quickly: Do you need Cat6 or Cat6A cables?
Both are solid choices for modern business networks. Both use the same RJ45 connectors and are backward compatible with older equipment. But the differences between them, particularly around speed over distance, shielding, and compliance with Australian Standards, can have a real impact on your network’s performance and longevity.
Here’s what you need to know to make the right call for your business.
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The Quick Comparison
Before we get into the details, here’s how Cat6 and Cat6A cables compare on the specs that matter most:
| Cat6 | Cat6A | |
| Standard | AS/NZS 11801 Class E | AS/NZS 11801 Class EA |
| Bandwidth | 250 MHz | 500 MHz |
| Max speed | 1 Gbps at 100m; 10 Gbps up to 55m | 10 Gbps at 100m |
| Shielding | Usually unshielded (UTP) | Often shielded (F/UTP or U/FTP) |
| Cable diameter | Thinner, more flexible | Thicker, less flexible |
| Cost | Lower | Higher |
| PoE support | Standard PoE | Better for high-power PoE |
Speed and Bandwidth: Where It Actually Matters
Both Cat6 and Cat6A cables can technically handle 10 Gbps data transmission. The difference is distance.
Cat6 cables support 10 Gbps speeds over shorter runs of up to 55 metres under ideal conditions. In environments where cables are bundled tightly together (which increases crosstalk), that drops to around 33 metres. At the full 100-metre distance, Cat6 maxes out at 1 Gbps.
Cat6A cables support 10 Gbps at the full 100 metres, regardless of how many cables are running alongside each other. The doubled bandwidth (500 MHz vs 250 MHz) gives Cat6A more headroom for reliable data transmission, especially in busy network environments.
For most small offices running standard 1 Gbps equipment today, Cat6 handles the job fine. But if your business relies on large file transfers, video conferencing, cloud-based applications, or you’re planning to upgrade your switches and network hardware in the next few years, Cat6A gives you the headroom to grow without re-cabling.
Crosstalk and Interference
Crosstalk is the signal interference that occurs when data travelling through one cable bleeds into an adjacent cable. In a commercial environment where dozens of network cables run through the same conduit or cable tray, this is a real concern.
Cat6 cables manage internal crosstalk (between twisted pairs within the same cable) reasonably well, thanks to tighter twists and a plastic spline that separates the pairs. But they’re more vulnerable to alien crosstalk, which is the interference between separate cables running alongside each other.
Cat6A cables are engineered specifically to minimise alien crosstalk. The tighter manufacturing tolerances, combined with shielding options, mean Cat6A performs consistently even in high-density cable bundles. Industry testing shows Cat6A delivers roughly 25% better near-end crosstalk performance compared to Cat6.
If your business has a server room, multiple data drops per desk, or a lot of cabling running through shared pathways, Cat6A’s crosstalk resistance becomes a practical advantage rather than just a spec sheet number.
Shielding: UTP, F/UTP, and U/FTP
Both Cat6 and Cat6A cables come in shielded and unshielded versions, but the defaults differ.
UTP (Unshielded Twisted Pair) relies on the twist of the copper pairs alone to reduce interference. Most Cat6 cables sold in Australia are UTP. They’re lighter, more flexible, and easier to terminate.
F/UTP (Foiled/Unshielded Twisted Pair) adds an overall foil shield around all four pairs. This provides a basic layer of protection against external electromagnetic interference (EMI).
U/FTP (Unshielded/Foiled Twisted Pair) wraps each individual pair in its own foil shield. This is common in Cat6A cables and is particularly effective at reducing alien crosstalk between pairs.
S/FTP (Shielded/Foiled Twisted Pair) combines both an overall braid shield and individual foil shielding per pair. This offers maximum protection and is used in environments with heavy electrical interference, such as near industrial equipment, switchboards, or radio transmitters.
One thing to note: shielded cables require proper earthing at both ends to work correctly. If the shielding isn’t properly grounded, it can actually make interference worse. That’s why professional installation matters.
What Australian Standards Say
This is where things get interesting for commercial installations. Under AS/NZS 11801.6:2019, the Australian Standard for distributed building services, Cat6A (Class EA) is the minimum specified category for cabling to devices like wireless access points (WAPs), security cameras, and other networked building services.
Adhering to this standard isn’t legally mandatory, but going outside it carries risk. If a security camera or access point fails to perform at a critical moment and the installation doesn’t meet the relevant Australian Standard, that can create liability issues for the building owner and the installer.
For standard office data points (desktops, phones, printers), Cat6 still meets the requirements under AS/NZS 11801.2. But for any distributed building services, Cat6A is what the standards call for.
This is worth knowing before you commit to a cabling specification for a new fit-out or upgrade. Installing Cat6 now and re-cabling to Cat6A later for cameras and WAPs costs significantly more than getting it right the first time.
PoE: Power Over Ethernet
More business devices are now powered over Ethernet cables rather than separate power supplies. This includes wireless access points, security cameras (especially PTZ models), VoIP phones, and IoT sensors.
Both Cat6 and Cat6A support PoE, but Cat6A handles it better. When electrical current flows through copper conductors, it generates heat. In large cable bundles carrying PoE, that heat can degrade data transmission performance.
Cat6A’s lower insertion loss and better thermal characteristics make it the more reliable choice for high-power PoE applications, particularly 802.3bt Type 3 (up to 60W) and Type 4 (up to 90W) deployments. If you’re planning a network with a lot of PoE-powered devices, Cat6A reduces the risk of heat-related performance issues over time.
Cost: What You’re Actually Paying For
Cat6A costs more than Cat6. That’s true for the cable itself, the connectors, patch panels, and the installation labour (Cat6A is thicker and less flexible, so it takes more time to pull through conduit and terminate).
For a typical commercial office fit-out, the cable and component cost difference is roughly 20 to 40% more for Cat6A over Cat6, depending on the shielding type and manufacturer. Installation labour can also increase because Cat6A’s thicker diameter requires more pathway space and careful handling to maintain its tighter bend radius.
But the real cost calculation isn’t just about today’s price. It’s about the total cost of ownership over the life of your cabling infrastructure. Structured cabling typically stays in place for 10 to 15 years. If your network needs to outgrow Cat6 in that time, the cost of re-cabling, including downtime, access to ceiling spaces, and re-certification, far exceeds the upfront premium for Cat6A.
So Which One Does Your Business Need?
Cat6 still makes sense when:
- Your network runs at 1 Gbps and you don’t anticipate needing 10 Gbps in the near future
- Cable runs are short (under 55 metres) and you do need 10 Gbps
- Budget is tight and the installation is in a low-interference environment
- You’re supplementing an existing Cat6 network with additional drops
Cat6A is the better choice when:
- You’re running new cabling for a fit-out or new build (future-proofing is cheap at this stage)
- You need guaranteed 10 Gbps over the full 100 metres
- The installation includes WAPs, security cameras, or other distributed building services (as specified by AS/NZS 11801.6)
- You’re deploying high-power PoE devices
- Cables will run through high-density pathways alongside other cables or near electrical interference sources
For most new commercial installations on the Sunshine Coast, we recommend Cat6A as the default. The price premium is modest compared to the labour cost of installation, and it means the cabling infrastructure is ready for whatever your network needs in the years ahead.
Need Help With Your Network Cabling?
Terawatt designs and installs structured data cabling for commercial properties across the Sunshine Coast. We work with Cat6A as our standard for new installations, and we certify every cable run to confirm it meets performance requirements.
Whether you’re planning a new office fit-out, upgrading an older network, or adding data points to an existing setup, we can help you work out the right solution.
