With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
x21ClkFrequencyThreshold
x21 Clk Frequency Threshold
1.3.6.1.4.1.351.110.4.5.1.1.1.11
This object indicates user configurable percentage of clock frequency, which is used by DTE clock monitoring to declare clock rate out of bound alarm. This object is valid only for X.21/v.35/HSSI DTE interfaces. This object is supported by FRSM-HS2 and FRSM-HS2/B
Back to CISCO-WAN-FR-X21-MIB MIB page.
IPHost Network monitor allows you to monitor x21ClkFrequencyThreshold 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.