With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxRowStatusEntry
Frame Relay Mux Row Status Entry
1.3.6.1.4.1.1570.1.1.1
A single entry in the table represents a single frMux component.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxRowStatusEntry 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 switches right now.