Application choice will significantly impact the sensor density and sensor placement. For example, rogue detection in a no wireless zone needs fewer sensors as even sporadic emanations from a wireless device, at the lowest data rate and longest range, can reveal the presence of a rogue. As the applications become more complex, they may require a representative sample of frames or meet certain minimum signal level thresholds, increasing the sensor density requirement.
Using these factors in baseline decisions with regard to sensor placement, the following coverage area guidelines may be applied to establish an effective deployment.
| Application | RSSI |
|---|---|
Rogue Detection |
> -90dBm |
Policy Enforcement |
> -80dBm |
Mitigation (Termination) |
> -70dBm |
Location Tracking |
Every device has to be seen by three or more sensors and/or infrastructure APs on the same floor plan. |
Sensors that may be exposed to harsh environments can be placed in accessory enclosures (NEMA-4) that protect the sensor and provide code, regulatory compliance, or both.