With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnInThroughputClassSize
x25 Dte Logical Channel Number In Throughput Class Size
1.3.6.1.4.1.562.2.4.1.90.4.11.1.8
This attribute specifies the receive throughput class.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnInThroughputClassSize 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.