With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnT22ResetTimeouts
x25 Dte Logical Channel Number T22 Reset Timeouts
1.3.6.1.4.1.562.2.4.1.90.4.13.1.10
This attribute counts the number of times the t22 reset timer has expired.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnT22ResetTimeouts 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.