The cabling category question that Irish ICT consultants and M&E engineers are increasingly asked is: should this project specify Cat6A or Cat8? The answer is almost always Cat6A for commercial building horizontal cabling and Cat8 only for specific data centre short-range applications. But the confidence with which vendors promote Cat8 — and the frequency with which clients ask about it after reading marketing material — means that a clear, authoritative technical comparison is genuinely useful for Irish designers in 2025.
This guide covers the key technical differences between Cat6A and Cat8 structured cabling for Irish projects, where each is appropriately specified, the implications for PoE power delivery, Wi-Fi 7 backhaul requirements, and the emerging Single-Pair Ethernet (SPE) technology that will eventually influence IoT cabling decisions in Irish buildings.
Why Cabling Category Specification Matters in Ireland in 2025
Structured cabling is the most enduring component of a building's ICT infrastructure. Unlike active equipment — switches, APs, cameras — which will be replaced every 5–7 years, cabling infrastructure is expected to last 25 years. Specifying the wrong category in a new Irish commercial building in 2025 creates a legacy constraint that limits the building's capability for its entire useful life. The additional cost of specifying Cat6A over Cat6 is typically 5–10% of total cabling installation cost — a small premium for 25 years of future-proofing.
Cat6A — The Workhorse of Irish Commercial Buildings
Cat6A Performance: 10GBASE-T to 100 Metres
Cat6A cabling for Ireland (ISO/IEC 11801 Class EA) supports 10GBASE-T active equipment at the full 100-metre horizontal channel length — the standard maximum for structured cabling in Irish commercial buildings. This 10G capability is currently beyond the active equipment deployed in most Irish commercial offices (where 1G to the desktop remains standard), but it provides substantial headroom for future active equipment upgrades without re-cabling. For Wi-Fi 7 APs, IP cameras and access control readers that increasingly specify 2.5G or 5G ports, Cat6A provides comfortable headroom.
Cat6A PoE++ Capacity
Cat6A supports the full IEEE 802.3bt Type 4 PoE++ specification (90W per port) without the de-rating that affects Cat6 cable at higher power levels. For Irish buildings specifying Wi-Fi 7 APs (60W), high-power IP cameras (25W), and door access control with lock, reader and REX heater (up to 45W combined), Cat6A is the minimum cabling standard to avoid PoE power delivery issues. Cat6 cable at 90W PoE experiences temperature rise and resistance increase that reduces actual delivered power — a design compliance issue that is frequently identified only during commissioning.
Cat8 — When and Why to Specify It
Cat8.1 vs Cat8.2 — The Key Difference
Cat8 exists in two variants: Cat8.1 (ISO/IEC 11801 Class I, compatible with 4-connector RJ45 channel) and Cat8.2 (ISO/IEC 11801 Class II, requires TERA or ARJ45 connectors, not backward compatible with standard patch panels). For Irish data centre projects, Cat8.1 is the specified variant in all cases — Cat8.2's connector incompatibility with existing Irish data centre infrastructure makes it commercially impractical for most deployments.
Cat8 in the Irish Data Centre — Short-Range Patch Cabling
Cat8 is correctly specified in Irish data centres for: server-to-top-of-rack switch connections within a cabinet or adjacent cabinets (within 30m); breakout connections from fibre aggregation switches to dense server patches; and direct-attach copper (DAC) cable alternatives where active optical costs are not justified. Cat8 is NOT appropriate for inter-rack backbone cabling, floor distribution cabling, or any horizontal cabling application in commercial buildings — these use cases require fibre (OM4/OS2) or Cat6A respectively.
| Characteristic | Cat6A | Cat8.1 |
|---|---|---|
| Standard | ISO/IEC 11801 Class EA | ISO/IEC 11801 Class I |
| Max speed | 10GBASE-T | 40GBASE-T |
| Max distance | 100m (90m permanent link) | 30m |
| PoE support | Up to 90W (802.3bt Type 4) | Up to 90W (802.3bt Type 4) |
| Connectors | Standard RJ45 | RJ45 (Cat8.1 only) |
| Primary use | Commercial building horizontal | Data centre short-range patch |
| Cost vs Cat6A | Baseline | +40–70% premium |
Single-Pair Ethernet (SPE) — The IoT Cable of the Future in Irish Buildings
Single-Pair Ethernet (IEEE 802.3cg, also known as 10BASE-T1L) uses a single pair of copper conductors to deliver 10Mbps Ethernet and up to 20W of PoE at distances up to 1,000 metres. This makes it ideal for IoT applications in Irish commercial and industrial buildings where devices (sensors, actuators, meters) need network connectivity at long cable runs but have minimal bandwidth requirements.
In Irish commercial buildings, SPE is beginning to appear in: building automation sensors (CO2, temperature, humidity, occupancy); smart lighting control and metering; industrial IoT in Irish pharmaceutical and manufacturing facilities; and campus security perimeter devices at long cable runs. SPE cabling is significantly thinner and lighter than Cat6A, making it practical for IoT device connections in ceiling voids and duct runs where Cat6A would be impractical. While SPE is not yet mainstream in Irish commercial ICT infrastructure, it will increasingly appear in building automation design specifications through 2025–2030.
How to Write a Future-Proof Cabling Specification for Ireland in 2025
For new Irish commercial building ICT designs in 2025, the correct cabling specification is:
- Horizontal cabling to workstations, APs, cameras, access control: Cat6A UTP or STP (ISO/IEC 11801 Class EA), 100m maximum channel length, 90m maximum permanent link
- Backbone between IDFs and MDF: OM4 multi-mode fibre (campus links up to 400m) or OS2 single-mode fibre (links above 400m or requiring 10G+ capacity)
- Data centre server-to-switch patch: Cat8.1 for runs up to 30m; OM4/OS2 fibre for runs above 30m
- IoT building automation devices: SPE (10BASE-T1L) or existing proprietary bus protocols (BACnet, Modbus) depending on system specification
See our structured cabling design Ireland service page for the full ICT design scope, and our ICT design consultancy Ireland page for network infrastructure design services.
FAQs — Cat6A vs Cat8 Ireland
Cat6A for all horizontal cabling in a Dublin office. Cat8 is not appropriate for commercial building horizontal cabling — its 30m maximum distance is insufficient for standard office floor plate configurations. Cat8 is a data centre short-range patch cable technology, not a commercial building technology.
Cat8.1 supports 40GBASE-T and 25GBASE-T at a maximum of 30 metres. This makes it suitable for server-to-top-of-rack switch connections and within-cabinet patch applications in Irish data centres, but not for inter-rack backbone or floor distribution cabling which requires fibre.
Cat6A is the correct minimum for Wi-Fi 7 AP backhaul (10GBASE-T capable). Cat6 bottlenecks the AP uplink to 1Gbps — 1/10 of Wi-Fi 7's wireless capacity. Cat8 is not required; Cat6A provides sufficient capacity for current enterprise Wi-Fi 7 deployments.
SPE (IEEE 802.3cg) uses one copper pair to deliver 10Mbps and 20W PoE at up to 1,000m. It is designed for IoT applications in Irish buildings — CO2 sensors, temperature monitors, occupancy sensors, smart metering — where long cable runs are needed but bandwidth requirements are minimal. Not yet mainstream in standard commercial ICT infrastructure.
No. Cat8 itself is not GDPR-relevant. CCTV cabling infrastructure must be documented in the data flow diagram supporting the legitimate interest assessment for the surveillance system, but the choice between Cat6A and Cat8 does not affect GDPR compliance. What matters is adequate encryption and access control for CCTV data traffic.
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