With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnUpTime
appn Up Time
This attribute represents the time in hundredths of a second since the node was started or restarted.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnUpTime 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 multiplexers right now.