With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpTbsgOutFrames
Virtual Router Passport Tbsg Out Frames
This attribute is indicative of the number of frames that have been transmitted out this bridge port. Note that frame transmitted out this bridge port is counted if and only if it is for a protocol being processed by the bridge unit. This also includes management frames.This counter wraps around its maximum value of 4294967295.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpTbsgOutFrames 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 modems right now.