With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxLmiEventCount
Frame Relay Mux Lmi Event Count
1.3.6.1.4.1.1570.1.3.10.1.5
This attribute specifies the number of contiguous events within which no more than eventErrorThreshold error events are allowed. This attribute corresponds to n392 of the ANSI and CCITT specifications and nN3 of the Vendor Forum Specification. This attribute must be greater than or equal to errorEventThreshold.
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IPHost Network monitor allows you to monitor frMuxLmiEventCount 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.