With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cd11IfPrivacyOptionMaxRate
Cisco DOT11 Interfaces Privacy Option Max Rate
1.3.6.1.4.1.9.9.272.1.1.1.1.1.4
This object specifies the maximum transmit bit rate supported by the radio when using, for example, WEP encryption. The rate is expressed in standard IEEE 802.11 increments of 500Kb/sec.
Back to CISCO-DOT11-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cd11IfPrivacyOptionMaxRate on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.