With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frUniDlciBciToSubnet
Frame Relay Uni Dlci Bci To Subnet
This attribute counts the frames sent into the network with the Backward Congestion Indication (BCI) bit set. When the count reaches maximum it wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayUniMIB MIB page.
IPHost Network monitor allows you to monitor frUniDlciBciToSubnet 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.