With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cd11IfTransDeferEnerDetects
Cisco DOT11 Interfaces Trans Defer Ener Detects
1.3.6.1.4.1.9.9.272.1.2.1.1.1.1
This counter shall increment when a frame transmission is deferred due to energy detection.
Back to CISCO-DOT11-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cd11IfTransDeferEnerDetects on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.