With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
catmDownPVclRangeEntry
Cisco ATM Down PVcl Range Entry
1.3.6.1.4.1.9.10.97.1.8.1
Each entry in this table represents a range of VCLs and for each VCL there is an active row in the atmVclTable having an atmVclConnKind value of 'pvc' and atmVclOperStatus to have detected as Down in the last notification interval.
Back to CISCO-ATM-PVCTRAP-EXTN-MIB MIB page.
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