With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniLtsPatDataSize
Frame Relay Nni Lts Pat Data Size
This attribute specifies the payload size of each frame in bytes. This is in excess to the header.
Back to Nortel-Magellan-Passport-FrameRelayNniMIB MIB page.
IPHost Network monitor allows you to monitor frNniLtsPatDataSize 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 switches right now.