Extreme Networks Altitude 3500 Series, Product Reference Manual

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Introduction
Altitude 3500 Series Access Point Product Reference Guide
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For detailed information on configuring an Altitude 35xx WLAN to disallow MU to MU
communications, see
“Creating/Editing Individual WLANs” on page 135 .
Voice Prioritization
Each Altitude 35xx access point WLAN has the capability of having its QoS policy configured to
prioritize the network traffic requirements for associated MUs. A WLAN QoS page is available for each
enabled WLAN on both the 802.11a and 802.11b/g radio.
Use the QoS page to enable voice prioritization for devices to receive the transmission priority they may
not normally receive over other data traffic. Voice prioritization allows the access point to assign
priority to voice traffic over data traffic, and (if necessary) assign legacy voice supported devices (non
WMM supported voice devices) additional priority.
For detailed information on configuring voice prioritization over other voice enabled devices, see
“Setting the WLAN Quality of Service (QoS) Policy” on page 142 .
Support for CAM and PSP MUs
The access point supports both CAM and PSP powered MUs. CAM (Continuously Aware Mode) MUs
leave their radios on continuously to hear every beacon and message transmitted. These systems
operate without any adjustments by the access point.
A beacon is a uniframe system packet broadcast by the AP to keep the network synchronized. A beacon
includes the ESSID, MAC address, Broadcast destination addresses, a time stamp, a
DTIM (Delivery
Traffic Indication Message) and the TIM (Traffic Indication Map) .
PSP (Power Save Polling) MUs power off their radios for short periods. When a MU in PSP mode
associates with an access point, it notifies the access point of its activity status. The access point
responds by buffering packets received for the MU. PSP mode is used to extend an MU’s battery life by
enabling the MU to “sleep” during periods of inactivity.
Statistical Displays
The access point can display robust transmit and receive statistics for the WAN and LAN ports. WLAN
stats can be displayed collectively and individually for enabled WLANs. Transmit and receive statistics
are available for the access point’s 802.11a and 802.11b/g radios. An advanced radio statistics page is
also available to display retry histograms for specific data packet retry information.
Associated MU stats can be displayed collectively and individually for specific MUs. An echo (ping) test
is also available to ping specific MUs to assess association strength. Finally, the access point can detect
and display the properties of other APs detected within the access point’s radio coverage area. The type
of AP detected can be displayed as well as the properties of individual APs.
For detailed information on available access point statistical displays and the values they represent, see
“Monitoring Statistics” on page 231 .