With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniLtsPatDefaultDataSize
Frame Relay Nni Lts Pat Default 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 frNniLtsPatDefaultDataSize 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.