With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpwCTDMPerfIntervalValidData
Cisco Pseudo Wire CTDM Performance Interval Valid Data
1.3.6.1.4.1.9.10.131.1.6.1.2
This variable indicates if the data for this interval is valid.
Back to CISCO-IETF-PW-TDM-MIB MIB page.
IPHost Network monitor allows you to monitor cpwCTDMPerfIntervalValidData on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.