With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwSlotIndex
cw Slot Index
1.3.6.1.4.1.351.150.1.1.5.1.1.1
This object's value generally corresponds to the Slot number where the module resides. However, System wide uniqueness is the only true requirement.
Back to CISCO-WAN-ATM-CONN-MIB MIB page.
IPHost Network monitor allows you to monitor cwSlotIndex 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.