With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxDlciBecnFrmToIf
Frame Relay Mux Dlci Becn Frm To If
1.3.6.1.4.1.1570.1.4.13.1.9
This attribute counts the frames sent to the interface with the Backward Explicit Congestion Notification (BECN) bit set. When the count reaches maximum it wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxDlciBecnFrmToIf 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 multiplexers right now.