/ Engineering · Infrastructure
Infrastructure
power, pathways, cabling, racks.
The building's permanent skeleton — sized for 20 years, not for this year's device.
- Default cabling spec
- Cat6A, 25% spare capacity, 25-year warranty
- PoE switching headroom
- 30% on both budget and bandwidth
- Rack planning
- 2U spare per row, 25-30% spare power
Infrastructure is the part of the building that the devices live in. The cable trays. The conduit pathways. The rack rows. The PoE switching backbone. The UPS distribution. The BMS riser. Each is sized at design and remains in place for the building's lifetime. Devices come and go; infrastructure stays. Under-sized infrastructure becomes a refurbishment cost at every refresh cycle; right-sized infrastructure absorbs refresh cycles silently.
We size infrastructure for a 20-year horizon. Cabling at Cat6A or better, with 25% spare capacity. PoE switching with 30% headroom on budget and bandwidth. Conduit pathways at 40-50% fill, not 80%. Rack space with two spare U per row. UPS distribution sized for the next refresh, not the current load. The cost premium at year one is small — typically 5-12%; the cost saved across the lifecycle is large.
/ Sample interoperability matrix
CCTV + PoE switching + storage
IP cameras need PoE switches sized for both power and bandwidth, and storage sized for retention × bitrate × camera-count.
| Partner system | Fit | Engineering note |
|---|---|---|
PoE Standard poe-standard | Native | IEEE 802.3bt provides up to 90 W per port — sufficient for heated PTZ. |
Cat6A Cabling cat6a-cabling | Native | Required for PoE++ above 60 W per port and 10G aggregation links. |
Entity graph
Related entities in the engineering graph
infrastructure system
Cat6A Structured Cabling
Augmented Category 6 structured cabling — 10 Gbps over the full 100 m channel, rated for 25 years of service. The default for any new commercial or premium-residential cabling layer.
protocol
Power over Ethernet (IEEE 802.3)
IEEE-standard delivery of low-voltage DC power over the same Cat-class cable as data. PoE+ delivers up to 30 W; PoE++ Type 3/4 up to 90 W — sufficient for IP cameras, APs, VOIP phones and small displays.
technology
Wi-Fi 7 (IEEE 802.11be)
Current generation of Wi-Fi. Adds 6 GHz band, MLO multi-link operation and 320 MHz channels. Default for new premium deployments where dense-room capacity is the binding constraint.
Interoperability
Related interoperability matrices
Interoperability
CCTV + PoE switching + storage — the IP surveillance triad
IP cameras need PoE switches sized for both power and bandwidth, and storage sized for retention × bitrate × camera-count.
Interoperability
Wi-Fi density engineering — capacity over coverage
Premium Wi-Fi is sized for concurrent client density, not square-metre coverage. AP placement, channel plan and PoE budget are interlocked.
Services
Where this maps to services
Engineering toolkit
Tools for this work
calculator
PoE Budget Calculator
PoE-powered device counts in — total watts, switch tier (PoE+ / PoE++ Type 3 / Type 4), and indicative SKU band out. 30% headroom built in.
calculator
Network & PoE Calculator
Sized to year-three load — switches, Wi-Fi 7 access points, PoE budget, Cat6A run count, project cost. Cisco / HPE Aruba / Juniper-class enterprise gear.
interactive
Rack & Architecture Explorer
A reference AV cinema rack, IT/network rack and BMS panel. Hover any unit and we tell you what it does and why it's sized that way. The boring rack that runs the room.
Methodology
Methodology principles cited above
design
Infrastructure first, devices second
Power, pathways and cabling outlive every device that plugs into them. Specify infrastructure for the building's lifetime, not the current device.
lifecycle
Lifecycle economics over capex minima
The cheapest specification at year one is rarely the cheapest at year seven. Specify against total lifecycle cost.
Glossary
Related glossary terms
Networking
Cat6A
Augmented Category 6 structured cabling. Supports 10 Gbps over the full 100 m channel without compromise, rated for 25 years of service. Premium over Cat6 is no…
Networking
PoE
Power over Ethernet. Delivers low-voltage DC power to network devices over the same Cat-class cable that carries data. PoE+ delivers up to 30 W; PoE++ up to 90 …
Networking
Wi-Fi 7
IEEE 802.11be. The current generation of Wi-Fi as of 2026, adding 6 GHz band, MLO multi-link operation and 320 MHz channels. Real-world capacity gains over Wi-F…
· Last reviewed 2026-05-17 · infrastructure system
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Continue exploring
Concept
Power over Ethernet (IEEE 802.3)
IEEE-standard delivery of low-voltage DC power over the same Cat-class cable as data. PoE+ delivers up to 30 W; PoE++ Type 3/4 up to 90 W — sufficient for IP cameras, APs, VOIP phones and small displays.
Concept
Wi-Fi 7 (IEEE 802.11be)
Current generation of Wi-Fi. Adds 6 GHz band, MLO multi-link operation and 320 MHz channels. Default for new premium deployments where dense-room capacity is the binding constraint.
Service
IT & Networking
Wires the building's nervous system.
Tool
Network & PoE Calculator
Sized to year-three load — switches, Wi-Fi 7 access points, PoE budget, Cat6A run count, project cost. Cisco / HPE Aruba / Juniper-class enterprise gear.
Service
Structured Cabling
Backbones rated for the next quarter-century.
Tool
PoE Budget Calculator
PoE-powered device counts in — total watts, switch tier (PoE+ / PoE++ Type 3 / Type 4), and indicative SKU band out. 30% headroom built in.