Specifications

Network Management
Altitude 3500 Series Access Point Product Reference Guide
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U-APSD (WMM Power Save) Support. The access point now supports Unscheduled Automatic Power
Save Delivery (U-APSD), often referred to as WMM Power Save. U-APSD provides a periodic frame
exchange between a voice capable MU and the access point during a VoIP call, while legacy power
management is still utilized for typical data frame exchanges. The access point and its associated MU
activate the new U-APSD power save approach when a VoIP traffic stream is detected. The MU then
buffers frames from the voice traffic stream and sends a VoIP frame with an implicit "poll" request to its
associated access point. The access point responds to the poll request with buffered VoIP stream
frame(s). When a voice-enabled MU wakes up at a designated VoIP frame interval, it sends a VoIP
frame with an implicit “poll” request to its associated access point. The access point responds to the poll
request with buffered VoIP stream frame(s).
NOTE
The access point ships with the U-APSD feature disabled by default. It is automatically enabled when
WMM is enabled for a WLAN. Thus, U-APSD is only functional when WMM is enabled. If WMM is disabled, then
U-APSD is disabled as well.
Configuring WLAN Hotspot Support
The access point enables hotspot operators to provide user authentication and accounting without a
special client application. The access point uses a traditional Internet browser as a secure authentication
device. Rather than rely on built-in 802.11security features to control access point association privileges,
configure a WLAN with no WEP (an open network). The access point issues an IP address to the user
using a DHCP server, authenticates the user and grants the user to access the Internet.
When a user visits a public hotspot and wants to browse to a Web page, they boot up their laptop and
associate with the local Wi-Fi network by entering the correct SSID. They then start a browser. The
hotspot access controller forces this un-authenticated user to a Welcome page from the hotspot Operator
that allows the user to login with a username and password.
The access point hotspot functionality requires the following:
● HTTP Redirection—Redirects unauthenticated users to a specific page specified by the Hotspot
provider.
● User authentication—Authenticates users using a RADIUS server.
● Walled garden support—Enables a list of IP address (not domain names) accessed without
authentication.
● Billing system integration—Sends accounting records to a RADIUS accounting server.
CAUTION
When using the access point’s hotspot functionality, ensure MUs are re-authenticated when changes are
made to the characteristics of a hotspot enabled WLAN, as MUs within the WLAN will be dropped from access
point device association.
To configure hotspot functionality for an access point WLAN:
1 Ensure the Enable Hotspot checkbox is selected from within the target WLAN screen, and ensure the
WLAN is properly configured.
Any of the sixteen WLANs on the access point can be configured as a hotspot. For hotspot enabled
WLANs, DHCP, DNS,HTTP and HTTP-S traffic is allowed (before you login to the hotspot), while