With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteT23ClearTimeouts
x25 Dte T23 Clear Timeouts
1.3.6.1.4.1.562.2.4.1.90.28.1.20
This attribute counts the number of times the T23 clear timer has expired.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteT23ClearTimeouts 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.