With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteT20RestartTimer
x25 Dte T20 Restart Timer
1.3.6.1.4.1.562.2.4.1.90.21.1.5
This attribute provides the period in milliseconds within which a restart request packet should be confirmed.
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IPHost Network monitor allows you to monitor x25DteT20RestartTimer 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 secure routers right now.