With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cd11IfSuppDataRatesPrivacyValue
Cisco DOT11 Interfaces Supp Data Rates Privacy Value
1.3.6.1.4.1.9.9.272.1.1.2.11.1.2
This object defines the receiving or transmission bit rates supported by the PLCP and PMD, represented by a count from 0x02-0x7f, corresponding to data rates in increments of 500Kb/s from 1 Mb/s to 63.5 Mb/s.
Back to CISCO-DOT11-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cd11IfSuppDataRatesPrivacyValue 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.