Dell W-7030 AOS 6.4.x User Guide - Page 776

Graph Title Quality Spectrogram Description Update Interval This plot shows quality statistics for selected range of channels or frequencies as determined by the current noise floor, nonWi-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 809. 5 seconds Real-Time FFT Fast Fourier Transform, or FFT, is an algorithm for computing the frequency 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-AP68 access points. For details, see Real-Time FFT on page 810. 1 second Swept Spectrogram This plot displays FFT power levels For details, see or the FFT duty cycle for 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-AP68 access points. For details, see Swept Spectrogram on page 812. 1 second 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, because 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 verifies the device 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. Dell Networking W-Series ArubaOS 6.4.x | User Guide Spectrum Analysis | 776