With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpTbseInFrames
Virtual Router Passport Tbse In Frames
This attribute is indicative of the number of frames that have been received by this port from its segment. Note that a frame received on this bridge port is counted if and only if it can be processed by the bridge logic contained in this bridge unit, a protocol that can be processed by the bridge logic. This counter wraps around its maximum value of 4294967295.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpTbseInFrames 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.