Graph Title

Description

Update

Interval

 

 

 

interference power data for multiple channels, while a hybrid AP shows

 

 

information only for its one monitored channel. For details, see

 

 

"Interference Power" on page 598.

 

 

 

 

Quality

This plot shows quality statistics for selected range of channels or

Updates every 5 seconds

Spectrogram

frequencies as determined by the current noise floor, non-Wi-Fi (interferer)

 

 

utilization and duty-cycles and certain types of retries. This chart can also

 

 

be configured to show channel availability, the percentage of each

 

 

channel that is unused and available for additional traffic. Spectrum

 

 

monitors can show data for multiple channels, while a hybrid AP shows

 

 

information only for its one monitored channel. For details, see "Quality

 

 

Spectrogram" on page 600.

 

 

 

 

Real-Time FFT

Fast Fourier Transform, or FFT, is an algorithm for computing the frequency

Updates every second

 

spectrum of a time-varying input signal. This line chart shows the power

 

 

level of a signal on the channels or frequencies monitored by a spectrum

 

 

monitor radio. Spectrum monitors can show data for multiple channels,

 

 

while a hybrid AP shows information only for its one monitored channel.

 

 

This chart is not available for W-AP120 Series or W-AP68 access points.

 

 

For details, see "Real-Time FFT" on page 601.

 

 

 

 

Swept

This plot displays FFT power levels For details, see or the FFT duty cycle for

Updates every second

Spectrogram

a selected channel or frequency, as measured during each time tick.

 

 

Spectrum monitors can show data for multiple channels, while a hybrid AP

 

 

shows information only for its one monitored channel.

 

 

This chart is not available for W-AP120 Series or W-AP68 access points.

 

 

For details, see "Swept Spectrogram" on page 603.

 

 

 

 

Spectrum Analysis Clients

The maximum number of spectrum monitor radios and hybrid AP radios on a controller is limited only by the number of APs on that controller. If desired, you can configure every radio on an AP that supports the Spectrum Analysis feature as a spectrum device. A dual-radio AP can operate as two spectrum devices, since each radio can be individually configured as a spectrum monitor (SM) or hybrid AP.

A spectrum analysis client can simultaneously access data from up to four individual spectrum device radios. Each spectrum device radio, however, can only be connected to a single client WebUI.

When you select a specific spectrum monitor or hybrid AP radio to stream data to your client, the controller first checks the availability of the device, to verify that it is not subscribed to some other client. Once the SM or hybrid AP radio has been verified as available, the SM or hybrid AP establishes a connection to the client and begins sending spectrum analysis data either every second or every five seconds, depending on the type of data being requested. Each client may select up to twelve different spectrum analysis charts and graphs to appear in the spectrum dashboard.

A controller can support up to 22 active WebUI connections. If spectrum analysis clients are simultaneously viewing data for than 22 WebUI connections, any additional WebUI requests are refused until some clients close their WebUI browser sessions.

When you finish reviewing data from an SM or hybrid AP, you should disconnect the device from your spectrum client. Do not forget this important step—no other user can access data from that spectrum monitor or hybrid AP until you release your subscription. Note, however, that when you disconnect a spectrum monitor from your client, the AP continues to operate as a spectrum monitor until you return it to AP mode by removing the local spectrum override, or by changing the mode parameter in the AP’s 802.11a or 802.11g radio profile from spectrum-mode back to AP-mode.

573 Spectrum Analysis

Dell PowerConnect W-Series ArubaOS 6.2 User Guide

Page 573
Image 573
Dell 6.2 manual Spectrum Analysis Clients, Spectrogram, Real-Time FFT, Swept

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