User's Manual

Parameter Description
Max AP Power (dBm) Signal strength of the AP that has the maximum signal strength on a
channel.
Max Interference (dBm) Signal strength of the non-Wi-Fi device that has the highest signal strength.
SNIR (dB) The Signal-to-Noise-and-Interference Ratio (SNIR) is the ratio of signal
strength to the combined levels of interference and noise on that channel.
This value is calculated by determining the maximum noise-floor and
interference-signal levels, and then calculating how strong the desired
signal is above this maximum.
Device Duty Cycle
The Device Duty Cycle Chart is a stacked bar chart that shows the duty cycle of each device type on a channel.
The duty cycle is the percentage of time each device type operates or transmits on that channel. Though Wi-Fi
devices do not transmit if there is another Wi-Fi or non-Wi-Fi device active at that time, most non-Wi-Fi devices
do not follow such a protocol for transmissions. Because these devices operate independently without regard
to any other devices operating on the same channel, the total duty cycle of all device types may add up to
more than 100% on a channel. For example, one or more video bridges may be active on a channel, each with a
100% duty cycle. The same channel may have a cordless transmitter with a 10% duty cycle and a microwave
oven with a 50% duty cycle. In this example, the Device Duty Cycle chart shows all three device types with their
respective duty cycle percentages.
This chart is not available for W-AP68 access points. A hybrid AP on a 20 MHz channel will see 40 MHz Wi-Fi data as
non-Wi-Fi data.
Spectrum monitors display spectrum analysis data seen on all channels in the selected band, and hybrid APs
display data from the one channel they are monitoring. The example below shows data from a spectrum
monitor monitoring all channels in the 2.4 Ghz band.
Dell Networking W-Series ArubaOS 6.4.x | User Guide Spectrum Analysis | 724