With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
parClockEntry
par Clock Entry
1.3.6.1.4.1.351.130.4.1.1
Each entry represent a clock source available to PAR
Back to CISCO-WAN-PAR-MIB MIB page.
IPHost Network monitor allows you to monitor parClockEntry 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.