With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLapbStatsTable
x25 Dte Lapb Stats Table
1.3.6.1.4.1.562.2.4.1.90.5.13
This group contains the statistics for the LAPB interface.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLapbStatsTable 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.