With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
shelfCardFailureCause
shelf Card Failure Cause
1.3.6.1.4.1.43.1.12.3.1.1.2.2.12.1.2
This attribute specifies why the card has failed. This attribute is meaningful when the OSI AvailabilityStatus attribute is set to failed.
Back to Nortel-Magellan-Passport-ShelfMIB MIB page.
IPHost Network monitor allows you to monitor shelfCardFailureCause on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel modems right now.