Which two factors must be considered when evaluating an RF interferer for severity? (Choose two.)

Which two factors must be considered when evaluating an RF interferer for severity? (Choose two.)
A . distance from the AP
B . dBm
C . the type of security crack being used
D . duty cycle
E . number of interfering IP stations in the cell
F . duplicate SSID

View Answer

Answer: BD

Explanation:

On controller code 7.0 and later, you can configure Event Driven RRM (EDRRM) from the Wireless >802.11a/n [802.11b/g/n] > RRM > DCA page. Enabling EDRRM allows the controller to bypass the 600­second default interval for DCA and change an AP channel immediately if a disturbing non-802.11 interference is detected on the AP channel. You can set the sensitivity threshold to High (60), Medium (50), or Low (35). This threshold refers to the Air Quality index. CleanAir-capable APs (3500 and 3600 Series APs, with their CleanAir capable chipset) can detect and identify non-802.11 interferences and report them to the controller. These APs can report interferers when in local mode and monitor mode. Notice that the AP cannot report to the controller when in Spectrum Only Monitor Mode (SOMM). The controller uses the reported information to list non- 802.11 interferers along with their zone of impact and severity and establish an Air Quality Index (AQI) from 100 (perfect) to 0 (network unusable). Notice that the logic of the global AQ index (higher is better) is exactly the opposite of the logic of the individual interferer severity index (higher is more severe, and therefore worse). The severity index is calculated individually by each detecting AP based on the power (signal strength), duty cycle (how often the device uses the air per second), and detected type of interferer. The louder an interferer device, the higher the duty cycle will mean a higher severity index for the reporting AP. The severity index is calculated for a specific device, without regard to what channels are being affected.