With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmInitialLineSpeed
cm Initial Line Speed
1.3.6.1.4.1.9.9.47.1.3.4.1.1
A discrete initial speed at which the given line may operate
Back to CISCO-MODEM-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cmInitialLineSpeed 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.