Motorola WiNG 4.4, Reference Manual

Page: 24 / 598

1 - 8 WiNG 4.4 Switch System Reference Guide
• Static IP addresses
The benefits of an AAP deployment include:
• Centralized Configuration Management & Compliance - Wireless configurations across distributed sites can be
centrally managed by the wireless switch or cluster.
• WAN Survivability - Local WLAN services at a remote sites are unaffected in the case of a WAN outage.
• Securely extend corporate WLAN's to stores for corporate visitors - Small home or office deployments can utilize the
feature set of a corporate WLAN from their remote location.
• Maintain local WLAN's for specific applications - WLANs created and supported locally can be concurrently supported
with your existing infrastructure.
For an overview of AAP and how it is configured and deployed using the switch and Access Point, see
Adaptive AP Overview .
1.2.2.2 Physical Layer Features
802.11a
• DFS Radar Avoidance – Dynamic Frequency Selection (DFS) is mandatory for WLAN equipment intended to operate in
the frequency bands 5150 MHz to 5350 MHz and 5470 MHz to 5725 MHz when in countries of the EU.
The purpose of DFS is:
• Detect interference from other systems and avoid co-channeling with those systems (most notably radar systems).
• Provide uniform spectrum loading across all devices.
This feature is enabled automatically when the country code indicates that DFS is required for at least one of the
frequency bands that are allowed in the country.
• TPC – Transmit Power Control (TPC) meets the regulatory requirement for maximum power and mitigation for each
channel. TPC functionality is enabled automatically for every AP that operates on the channel.
802.11bg
• Dual mode b/g protection – ERP builds on the payload data rates of 1 and 2 Mbit/s that use DSSS modulation and
builds on the payload data rates of 1, 2, 5.5, and 11 Mbit/s, that use DSSS, CCK, and optional PBCC modulations. ERP
provides additional payload data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s. The transmission and reception
capability for 1, 2, 5.5, 11, 6, 12, and 24 Mbit/s data rates is mandatory.
Two additional optional ERP-PBCC modulation modes with payload data rates of 22 and 33 Mbit/s are defined. An ERP-
PBCC station may implement 22 Mbit/s alone or 22 and 33 Mbit/s. An optional modulation mode (known as DSSS-
OFDM) is also incorporated with payload data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s.
• Short slot protection – The slot time is 20 µs, except an optional 9 µs slot time may be used when the BSS consists of
only ERP STAs capable of supporting this option. The optional 9 µs slot time should not be used if the network has one
or more non-ERP STAs associated. For IBSS, the Short Slot Time field is set to 0, corresponding to a 20 µs slot time.
1.2.2.3 Rate Limiting
Rate Limiting limits the maximum rate sent to or received from the wireless network per mobile unit. It prevents any single
user from overwhelming the wireless network. It can also provide differential service for service providers. The uplink and
downlink rate limits are usually configured on the radius server using Motorola Solutions vendor specific attributes. The
switch extracts the rate limits from radius server response. When such attributes are not present, the global settings on
the switch are then applied.