Tx Power Control - Avaya AP-7 User Manual

Performing Advanced Configuration
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. If the AP has dual
Wireless NICs, the NIC in Slot A determines the regulatory domain. Depending on the
regulatory domain, a default country code is chosen that is transmitted in the beacon and probe
response frames.
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 you 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.
66 Avaya Wireless AP-7 User Guide