Brocade Mobility 7131 Access Point Product Reference Guide (Supporting software release 4.4.0.0 and later) - Manual (Page 36)

24 Brocade Mobility 7131 Access Point Product Reference Guide
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Power Setting Configuration
The access point’s power management functionality automatically configures the AP's operational
mode so it safely operates within available power. The power setting feature enables the user to
select one of three power operating modes, 3af, 3at and full power. When an access point is
operating in either 3af or 3at mode, the transmit power is always lower than the full power setting.
With the introduction of the Mobility 7131N model access point and its optional three radio SKU,
the power options available amongst single, dual and three radio model access points has never
been more diverse, and careful consideration must be made before deploying the access point.
The AP’s hardware design uses a complex programmable logic device (CPLD). When an AP is
powered on (or performing a cold reset), the CPLD determines the maximum power available to the
AP by a POE device. Once an operational power configuration is defined, the AP firmware can read
the power setting and configure operating characteristics based on the AP’s SKU and power
configuration. If the POE cannot provide sufficient power (with all interfaces enabled), the following
interfaces could be disabled or modified:
• Radio transmit power could be reduced due to lack of sufficient power or the radio can be
disabled
• The WAN port configuration could be changed (enabled or disabled)
For information on configuring the access point’s power configuration, see Configuring Power
Settings on page 4-70.
AMSDU Transmission Support
Aggregate MAC Service Data Unit (AMSDU) is an 802.11n specific MAC feature which enhances
the transmission of multiple MSDU contents wrapped within a single preamble/packet
infrastructure. The AMSDU transmission limit is set to 3839 bites by default.
For information on configuring AMSDU support for an access point radio, see Configuring the
802.11a/n or 802.11b/g/n Radio on page 5-167. AMSDU support can be defined by selecting the
Set Aggregation button within the Network Configuration -> Wireless -> Radio Configuration ->
Radio1 screen.
IPSec VPN Support
A VPN ensures data privacy between two end points, even while using a communication medium
which is itself insecure (like the Internet). VPNs create a secure tunnel between two end points as if
they are directly connected over a secure connection. Traffic is secured using a robust IPSec
encryption technique.
You can get the safety of a VPN in a WLAN by hosting the VPN server at the access point, and the
VPN client software on the MU. For that reason, a VPN provides secure WLAN access to MUs. A VPN
solution was more common before 802.11i was introduced, but is not as common now, since
802.11i/WPA2 is considered more secure.
For information on configuring VPN support, see Configuring VPN Tunnels on page 6-216. For
instructions on configuring a IPSec VPN tunnel using two access points, see Creating a VPN Tunnel
between Two Access Points on page 6-219.