With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnsSelectedInputSourceTable
cns Selected Input Source Table
1.3.6.1.4.1.9.9.761.1.1.2
T0 selected clock source table. This table contains the selected clock source for the input T0 clock.
Back to CISCO-NETSYNC-MIB MIB page.
IPHost Network monitor allows you to monitor cnsSelectedInputSourceTable 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.