With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdxIfUpChannelCmActive
Cisco DOCSIS If Up Channel Cable Modem Active
1.3.6.1.4.1.9.9.116.1.4.1.1.4
The count of cable modems that are active. Active cable modems are recognized by the cdxCmtsCmStatusValue other than offline(1).
Back to CISCO-DOCS-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cdxIfUpChannelCmActive on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.