Reference Guide

Dell PowerConnect W-Series ArubaOS 6.1 CLI | Reference Guide show ap spectrum interference-power | 771
show ap spectrum interference-power
show ap spectrum interference-power {ap-name <ap-name>}|{ip-addr <ip-addr>} freq-band
2.4ghz|5ghz [<chan-width>]
Description
This command shows the interference power detected by a 802.11a or 80211g radio on a spectrum monitor or
hybrid AP.
Syntax
Usage Guidelines
This table displays information about AP power levels, channel noise and adjacent channel interference seen on
each channel by a spectrum monitor or hybrid AP radio.
The output of this command displays the noise floor of each selected channel in dBm. The noise floor of a
channel depends on the noise figure of the RF components used in the radio, temperature, presence of certain
types of interferers or noise, and the width of the channel. For example, in a clean environment, the noise floor of
a 20 MHz channel is around -95 dBm and that of a 40 MHz channel is around -92 dBm. Certain types of fixed
frequency continuous transmitters such as video bridges, fixed frequency phones, and wireless cameras typically
elevate the noise floor as seen by the Wi-Fi radio. Other interferers such as the frequency hopping phones,
Bluetooth and Xbox devices may not affect the noise floor of the radio. A Wi-Fi radio can only reliably decode
Wi-Fi signals that are a certain dB above the noise floor and therefore estimating and understanding the actual
noise floor of the radio is critical to understanding the reliability of the RF environment.
The ACI column displayed in the Interference Power Chart displays adjacent-channel interference (ACI) power
levels based on the signal strength(s) of the Wi-Fi APs on adjacent channels. A higher ACI value in Interference
Power Chart does not necessarily mean higher interference since the AP that is contributing to the maximum
ACI may or may not be very actively transmitting data to other clients at all times. The ACI power levels are
derived from the signal strength of the beacons.
Parameter Description
ap-name <ap-name> Name of the spectrum monitor or hybrid APfor which you want to view spectrum
information.
ip-addr <ip-addr> IP address of the spectrum monitor or hybrid AP for which you want to view spectrum
information.
freq-band 2.4ghz|5ghz View information for a specific radio type, either 2.4 GHz or 5 GHz.
<chan-width> Specify 20MHz or 40MHz to select the channel width for which you want to view
information. If you do not specify a channel width, the output of this command will display
the default 20MHz setting.