With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pxmExtClockPresent
pxm Ext Clock Present
1.3.6.1.4.1.351.110.3.16.9
Status of External T1/E1 Clock on PXM card.
Back to CISCO-MGX82XX-PXM-CLOCK-MIB MIB page.
IPHost Network monitor allows you to monitor pxmExtClockPresent on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.