With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DtePleInactivityTimer
x25 Dte Ple Inactivity Timer
1.3.6.1.4.1.562.2.4.1.90.6.10.1.1
This attribute specifies the period in milliseconds this interface will keep an idle connection open before closing it.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DtePleInactivityTimer 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 multiplexers right now.