Extreme Networks Summit WM Series Betriebsanweisung Seite 56

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Configuring the Altitude AP
Summit WM Series WLAN Switch and Altitude Access Point Software Version 4.1 User Guide
56
Altitude AP radios
The Altitude AP has two radios:
5 GHz radio supporting the 802.11a standard – The 802.11a standard is an extension to 802.11 that
applies to wireless LANs and provides up to 54 Mbps in the 5-GHz band. The 802.11a standard uses
an orthogonal frequency division multiplexing encoding scheme, rather than Frequency-Hopping
Spread Spectrum (FHSS) or Direct-Sequence Spread Spectrum (DSSS).
2.4 GHz radio supporting the 802.11b/g standards – The 802.11g standard applies to wireless LANs
and specifies a transmission rate of 54 Mbps. The 802.11b (High Rate) standard is an extension to
802.11 that specifies a transmission rate of 11 Mbps. Since 802.11g uses the same communication
frequency range as 802.11b (2.4 GHz), 802.11g devices can co-exist with 802.11b devices on the same
network.
The radios on the Altitude AP are enabled or disabled through the Summit Wireless Assistant. Both
radios can be enabled to offer service simultaneously. For more information, see “Topology of a WM-
AD” on page 87.
The Unlicensed National Information Infrastructure (U-NII) bands are three frequency bands of 100
MHz each in the 5 GHz band, designated for short-range, high-speed, wireless networking
communication.
The Altitude AP supports the full range of 802.11a:
5.15 to 5.25 GHz – U-NII Low Band
5.25 to 5.35 GHz – U-NII Middle Band
5.725 to 5.825 GHz – U-NII High Band
New 5.470 GHz to 5.725 GHz Band (when approved by FCC)
Altitude AP international licensing
Altitude APs are licensed to operate in North America, Japan (Altitude APs support 802.11j), the
European Union countries, and European Union free trade countries. Each European Union country is
assigned a particular radio band. The Altitude AP must be configured to operate on the appropriate
radio band according to each European Union country. For more information, see “European
Community” on page 257.
To configure the appropriate radio band according to each European Union country, use the Summit
Wireless Assistant. For more information, see “Modifying an Altitude AP’s properties” on page 68.
Discovery and registration overview
When the Altitude AP is powered on, it automatically begins a discovery process to determine its own
IP address and the IP address of the Summit WM series switch. When the discovery process is
successful, the Altitude AP registers with the Summit WM series switch.
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