With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
bsnGlobalDot11aBeaconPeriod
bsn Global Dot11a Beacon Period
1.3.6.1.4.1.14179.2.3.3.1.5
This attribute shall specify the number of TU that a AP Radio shall use for scheduling Beacon tranmissions. This value is transmitted in Beacon and Probe Response frames.
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IPHost Network monitor allows you to monitor bsnGlobalDot11aBeaconPeriod 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.