Extreme Networks Altitude 3500 Series, Руководство по продукции

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Introduction
Altitude 3500 Series Access Point Product Reference Guide
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For an overview of the Radio 1 (2.4 GHz) and Radio 2 (5 GHz) antennas supported on the access point’s
connectors, see
“Antenna Specifications” on page 573 . The Altitude 3550 model access point uses an
antenna suite primarily suited for outdoor use.
Sixteen Configurable WLANs
A Wireless Local Area Network (WLAN) is a data-communications system that flexibly extends the
functionalities of a wired LAN. A WLAN does not require lining up devices for line-of-sight
transmission, and are thus, desirable for wireless networking. Roaming users can be handed off from
one access point to another like a cellular phone system. WLANs can therefore be configured around
the needs of specific groups of users, even when they are not in physical proximity. Sixteen WLANs are
configurable on each access point.
To enable and configure WLANs on an access point radio, see “Enabling Wireless LANs (WLANs)” on
page 133 .
Support for 4 BSSIDs per Radio
The access point supports four BSSIDs per radio. Each BSSID has a corresponding MAC address. The
first MAC address corresponds to BSSID #1. The MAC addresses for the other three BSSIDs (BSSIDs #2,
#3, #4) are derived by adding 1, 2, 3, respectively, to the radio MAC address.
If the radio MAC address displayed on the Radio Settings screen is 00:A0:F8:72:20:DC, then the BSSIDs
for that radio will have the following MAC addresses:
For detailed information on strategically mapping BSSIDs to WLANs, see “Configuring the 802.11a or
802.11b/g Radio” on page 154 . For information on access point MAC address assignments, see
“Altitude 35xx MAC Address Assignment” on page 32 .
Quality of Service (QoS) Support
The Altitude 35xx QoS implementation provides applications running on different wireless devices a
variety of priority levels to transmit data to and from the access point. Equal data transmission priority
is fine for data traffic from applications such as Web browsers, file transfers or email, but is inadequate
for multimedia applications.
Voice over Internet Protocol (VoIP), video streaming and interactive gaming are highly sensitive to latency
increases and throughput reductions. These forms of higher priority data traffic can significantly benefit
from the Altitude 35xx QoS implementation. The
WiFi Multimedia QOS Extensions (WMM)
implementation used by the access point shortens the time between transmitting higher priority data
traffic and is thus desirable for multimedia applications. In addition, U-APSD (WMM Power Save) is
also supported.
BSSID MAC Address Hexadecimal Addition
BSSID #1 00:A0:F8:72:20:DC Same as Radio MAC address
BSSID #2 00:A0:F8:72:20:DD Radio MAC a1
BSSID #3 00:A0:F8:72:20:DE Radio MAC a2
BSSID #4 00:A0:F8:72:20:DF Radio MAC a3