With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLapbFramerNormPrioLinkUtilToIf
x25 Dte Lapb Framer Norm Prio Link Utilization To If
1.3.6.1.4.1.562.2.4.1.90.5.2.14.1.1
This attribute is the utilization of the normal and high priority data traffic (interruptable traffic) sent to the link as a percentage of the available bandwidth on the link. Note that this includes traffic with Transfer Priorities of 0, 6 and 9 and/or Emission Priority of 2 and 3. The utilization is the average for the last minute.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLapbFramerNormPrioLinkUtilToIf 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.