Brocade Communications Systems RFS6000 System Reference Manual page 21

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802.11bg
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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 Brocade 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.
Proxy-ARP
Proxy ARP is provided for client's whose IP address is known. The WLAN generates an ARP reply on
behalf of a client (if the client's IP address is known). The ARP reply contains the MAC address of
the client (not the MAC address of switch). Thus, the client does not awaken to send ARP replies
(increasing client battery life and conserving wireless bandwidth).
If s client goes into PSP without transmitting at least one packet, its Proxy ARP will not work.
HotSpot / IP Redirect
A hotspot is a Web page users are forced to visit before they are granted access to the Internet.
With the advent of Wi-Fi enabled client devices (such as laptops and PDAs) commercial hotspots
are common and can be found at many airports, hotels and coffee shops. The hotspot re-directs
the user's traffic on hotspot enabled WLANs to a web page that requires them to authenticate
before granting access to the WLAN. The following is a typical sequence for hotspot access:
1. A visitor with a laptop requires hotspot access at a site.
2. A user ID/ Password and hotspot ESSID is issued by the site receptionist or IT staff.
Brocade Mobility RFS4000, RFS6000, and RFS7000 System Reference Guide
53-1002515-01
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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.
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.
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