With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipCardSubChannelCuBusies
Cisco Channel Interface Processor Card Sub Channel Cu Busies
1.3.6.1.4.1.9.9.20.1.3.1.10
This is the number of control unit busies sent to the channel when this device was requested.
Back to CISCO-CHANNEL-MIB MIB page.
IPHost Network monitor allows you to monitor cipCardSubChannelCuBusies on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.