User guide

5-42
Cisco WLAN Controller Web Interface User Guide
OL-7416-04
Chapter 5 Wireless Menu Bar Selection
802.11h
802.11h
Use WIRELESS > Global RF > 802.11h to navigate to this page.
This page describes the 802.11h parameters.
Caution The 802.11a network should be disabled before you configure 802.11h network.
The 802.11h standard defines two sets of mechanisms - Dynamic Frequency Selection (DFS) and
Transmit Power Control (TPC) that ensure wireless networks operate according to regulatory
requirements for the 5-GHz spectrum.
When DFS is enabled, it detects the presence of other devices that use the same radio channel and
automatically switches the WLAN operation to another channel if necessary.
Transmit Power Control (TPC) reduces the radio-frequency (RF) output power of each network
transmitter to a level that minimizes the risk of interference to and from other systems, while allowing
satisfactory network performance.
The following tables describe the 802.11h parameters:
Table 5-48 Power Constraint Parameters
Parameter Description
Power Constraint Select this check box to enable TPC.
Local Power Constraint (only if Power Constraint
option is enabled).
Used to calculate the local maximum transmit
power for a channel. The valid range is 1 to
255dB.
Local maximum transmit power for a channel is
defined as the maximum transmit power level
specified for the channel in the Country element
minus the local power constraint specified for the
channel in the Power Constraint element.
Example: If a particular channel has a
maximum transmit power of 20dB and you set
the local power constraint to 5dB, then
Local maximum transmit power for the
channel = 20bB - 5dB = 15dB.
Table 5-49 Channel Switch Announcement Parameters
Parameter Description
Channel Announcement Check this check box to enable channel
announcement.
Channel announcement is a method in which the
access point announces when it is switching to a
new channel and the new channel number.
Quiet Mode If this checkbox is selected, the access point stops
transmission on the current channel.