With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwrClockRefExt
Cisco Wireless Clock Ref Ext
1.3.6.1.4.1.9.9.136.1.3.1.1.8
When this object is set to true(1), the wireless radio uses a 10MHz external reference clock.
Back to CISCO-WIRELESS-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cwrClockRefExt on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.