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 switch 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 switch 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.
A spectrum monitor or hybrid AP automatically disconnects from a client when you close the browser window you
used to connect the spectrum monitor to your client. However, if you use Internet Explorer and have multiple
instances of an Internet Explorer browser open, the data-streaming connection to the spectrum monitor or hybrid
AP is not released until 60 seconds after you close the spectrum client browser window. During this 60-second
period, the spectrum monitor is still connected to the client.
When a spectrum monitor or hybrid AP is not subscribed to any client, it still performs all classification tasks
and collect all necessary channel lists and device information. You can view classification, device, and channel
information for any active spectrum monitor or hybrid AP via the switch's command-line interface, regardless
of whether or not that device is sending real-time spectrum data to another client WebUI.
Individual spectrum analysis graphs and charts are explained in detail in Customizing Spectrum Analysis Graphs
on page 762.
Hybrid AP Channel Changes
By default, a hybrid AP only monitors the channel specified in its 802.11a or 802.11g radio profile for
spectrum interference. If you want to change the channel monitored by a hybrid AP, you must edit the channel
setting in those profiles. However, there are other AOS-W features that may automatically change the channels
on hybrid APs. APs using Dynamic Frequency Selection (DFS) perform off-channel scanning to detect the
presence of satellite and radar transmissions, and switch to a different channel if it detects that satellite or
radar transmissions are present. APs using the Adaptive Radio Response (ARM) feature constantly monitor the
network and automatically select the best channel and transmission power settings for that AP. If you
manually change a channel monitored by a hybrid AP, best practices are to temporarily disable the ARM
feature, as ARM may automatically return the channel to its previous setting.
If a hybrid AP is using ARM or DFS, that hybrid AP may automatically move to a different channel in response
to changes in the network environment. If a hybrid AP changes channels while it is connected to a spectrum
analysis client, the hybrid AP updates the graphs in the spectrum dashboard to start displaying spectrum data
for the new channel, and sends a log message to the session log. For details on changing the channel
monitored by a hybrid AP, see 802.11a and 802.11g RF Management Profiles on page 558.
AOS-W 6.5.3.x | User Guide Spectrum Analysis | 753
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