With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pxmPrimaryMuxClockSource
pxm Primary Mux Clock Source
1.3.6.1.4.1.351.110.3.16.1
This object identifies the source of the Primary Mux Clock for PXM card.
Back to CISCO-MGX82XX-PXM-CLOCK-MIB MIB page.
IPHost Network monitor allows you to monitor pxmPrimaryMuxClockSource 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.