With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dsx3RxTimingMarker
dsx3 Rx Timing Marker
1.3.6.1.4.1.351.110.4.4.1.1.1.1.18
Received timing marker bit in G.832 MA byte. This object can be set to traceable(1) to indicate that the timing source is tracable to a primary reference clock and is otherwise set to untraceable(2). This is always set to untraceable(2) in case of card where this feature is not supported. This feature is not supported in FRSM-VHS and CESM-T3/E3.
Back to CISCO-MGX82XX-DSX3-MIB MIB page.
IPHost Network monitor allows you to monitor dsx3RxTimingMarker 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.