With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxStatsEntry
Frame Relay Mux Stats Entry
1.3.6.1.4.1.1570.1.12.1
An entry in the frMuxStatsTable.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxStatsEntry 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.