With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIfTableEntryIfInUnknownProtos
Virtual Router If Table Entry If In Unknown Protos
1.3.6.1.4.1.562.2.4.1.100.10.10.1.15
The number of packets received via the interface which were discarded because of an unknown or unsupported protocol.
Back to Nortel-Magellan-Passport-VirtualRouterMIB MIB page.
IPHost Network monitor allows you to monitor vrIfTableEntryIfInUnknownProtos 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.