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Performing Advanced Configuration
Operational Mode
Operational Mode Selection
You can configure and view the following parameters within the Operational Mode screen.
•
Operational Mode: the mode of communication between the wireless clients and the Access Point:
•
802.11b only
•
802.11g only
•
802.11bg
•
802.11a
•
802.11g-wifi
IEEE 802.11d Support for Additional Regulatory Domains
The IEEE 802.11d specification allows conforming equipment to operate in more than one regulatory domain over
time. IEEE 802.11d support allows the AP to broadcast its radio's regulatory domain information in its beacon and
probe responses to clients. This allows clients to passively learn what country they are in and only transmit in the
allowable spectrum. When a client enters a regulatory domain, it passively scans to learn at least one valid channel,
i.e., a channel upon which it detects IEEE Standard 802.11 frames.
The beacon frame contains information on the country code, the maximum allowable transmit power, and the channels
to be used for the regulatory domain.
The same information is transmitted in probe response frames in response to a client's probe requests. Once the client
has acquired the information required to meet the transmit requirements of the regulatory domain, it configures itself
for operation in the regulatory domain.
The Wireless NIC determines the regulatory domain the AP is operating in. Depending on the regulatory domain, a
default country code is chosen that is transmitted in the beacon and probe response frames.
Configuring 802.11d Support
Perform the following procedure to enable 802.11d support, and select the country code:
1. Click Configure > Interfaces > Operational Mode.
2. Select Enable 802.11d.
3. Select the Country Code from the ISO/IEC 3166-1 CountryCode drop-down menu.
4. Click OK.
5. Configure Transmit Power Control and transmit power level if required.
TX Power Control
Transmit Power Control uses standard 802.11d frames to control transmit power within an infrastructure BSS. This
method of power control is considered to be an interim way of controlling the transmit power of 802.11d enabled clients
in lieu of implementation of 802.11h.
The Transmit Power Control feature lets the user configure the transmit power level of the wireless interface at one of
four levels:
•
100% of the maximum transmit power level defined by the regulatory domain
•
50%
•
25%
•
12.5%
When Transmit Power Control is enabled, the transmit power level of the card in the AP is set to the configured
transmit power level. The power level is advertised in Beacon and Probe Response frames as the 802.11d maximum
transmit power level.
When an 802.11d-enabled client learns the regulatory domain related information from Beacon and Probe Response
frames, it learns the power level advertised in Beacon and Probe response frames as the maximum transmit power of
the regulatory domain and configures itself to operate with that power level.
As a result, the transmit power level of the BSS is configured to the power level set in the AP (assuming that the BSS
has only 802.11d enabled clients and an 802.11d enabled AP).
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