With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
shelfBusTestResultsTable
shelf Bus Test Results Table
1.3.6.1.4.1.43.1.12.3.1.1.2.3.2.12
This attribute group contains the results of the bus test that is currently running; if no bus test is running, the attribute group contains the results of the most recently completed bus test. The attributes of the Results group are reset to their initial values whenever a bus test is started or any attribute in the Setup group is set.
Back to Nortel-Magellan-Passport-ShelfMIB MIB page.
IPHost Network monitor allows you to monitor shelfBusTestResultsTable 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 switches right now.