With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cD11HtMacTransitionTime
Cisco DOT11 Ht Mac Transition Time
1.3.6.1.4.1.9.9.626.1.1.1.1.11
This object indicates that the minimum transition time within which the STA can switch between 20 MHz channel width and 40 MHz channel width with a high probability.
Back to CISCO-DOT11-HT-MAC-MIB MIB page.
IPHost Network monitor allows you to monitor cD11HtMacTransitionTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.