With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniLtsBitRateTx
Frame Relay Nni Lts Bit Rate Tx
This attribute indicates the bit rate being sent to the link. It should only differ from the load if the burstTimeInterval would be >= the timeInterval or burstSize frames cannot be generated in 10ms (intervalBurst algorithm).
Back to Nortel-Magellan-Passport-FrameRelayNniMIB MIB page.
IPHost Network monitor allows you to monitor frNniLtsBitRateTx 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.