With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdxIfUpChannelCmRegistered
Cisco DOCSIS If Up Channel Cable Modem Registered
1.3.6.1.4.1.9.9.116.1.4.1.1.5
The count of cable modems that are registered and online on this upstream. Registered cable modems are those with one of the following values: registrationComplete(6) of docsIfCmtsCmStatusValue OR online(12), kekRejected(10), onlineKekAssigned(6), tekRejected(11), onlineTekAssigned(7) of cdxCmtsCmStatusValue.
Back to CISCO-DOCS-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cdxIfUpChannelCmRegistered on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.