With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteInRestarts
x25 Dte In Restarts
1.3.6.1.4.1.562.2.4.1.90.28.1.6
This attribute counts the number of restart packets received from the link while the service is in ready state.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteInRestarts 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.