With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxFramerLinkTable
Frame Relay Mux Framer Link Table
1.3.6.1.4.1.1570.1.2.11
This group contains attributes defining the framing of data on the link interface.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxFramerLinkTable 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.