With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frDteXmitDiscardPvcInactive
Frame Relay Dte Xmit Discard Pvc Inactive
Count of transmitted frames discarded because the Local Management Interface (LMI) had inactivated or invalidated the Dlci. This counter will wrap around to 0 when it exceeds its maximum count.
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IPHost Network monitor allows you to monitor frDteXmitDiscardPvcInactive 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.