Why surveys matter
Wi-Fi is shared radio. Walls, glass, shelving, people, lifts, machinery and neighbouring networks all change the result. A floor plan with guessed AP locations may work for a small office, but it is not enough for warehouses, schools, clinics, hotels, financial trading floors or production areas.
A survey reduces guesswork. It tells you whether the design supports the actual devices and applications that must run on the network.
The main survey types
| Survey type | When used | Output |
|---|---|---|
| Predictive design | Before site access or build-out. | Initial AP count, model, channel plan and cabling positions. |
| AP-on-a-stick | For new spaces with unknown wall or racking attenuation. | Measured signal propagation from temporary AP placements. |
| Passive survey | After installation or for troubleshooting. | Heatmaps for RSSI, SNR, channel overlap and interference. |
| Active survey | When application performance matters. | Throughput, latency, roaming and packet-loss measurements. |
| Spectrum analysis | When non-Wi-Fi interference is suspected. | Evidence of microwave, Bluetooth, cordless, industrial or radar interference. |
Start with requirements, not AP count
A proper survey begins with use cases. Voice handsets need different roaming and jitter tolerance from guest browsing. Barcode scanners may use older radios and need stronger 2.4 GHz coverage. Wi-Fi 6E and Wi-Fi 7 clients may benefit from 6 GHz, but only if client devices, regulatory settings, cabling and PoE budgets are ready.
- How many users and devices per area?
- Which applications are critical?
- Do devices roam while sessions remain active?
- What are the minimum RSSI, SNR and data-rate targets?
- Are there security zones, guest networks or location services?
- Can switches provide enough PoE+ or PoE++ for the AP models?
What a good survey report includes
The deliverable should be actionable for installers and support teams. At minimum it should include scaled floor plans, AP locations, mounting notes, cable drop locations, switch and PoE assumptions, SSID and VLAN requirements, channel and power recommendations, coverage heatmaps, capacity assumptions and a remediation list.
For critical environments, ask for a post-install validation survey. The design is only complete when the installed network is measured under realistic conditions.
Common mistakes
- Designing for signal strength only, without capacity or roaming tests.
- Using maximum AP transmit power, causing clients to stick to distant APs.
- Ignoring 2.4 GHz congestion while still supporting old devices.
- Installing Wi-Fi 7 APs without checking 2.5/5/10GbE uplinks and PoE budget.
- Surveying an empty warehouse that later fills with metal racks and inventory.
Sources and further reading
- Cisco WLAN site survey guidelines
- Cisco Wireless Site Survey FAQ
- Wi-Fi Alliance Wi-Fi CERTIFIED 7 introduction
- TechDirectory: Modern wireless stack