With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
dataSigChanNisFramerUnderruns
data Sig Chan Nis Framer Underruns
This attribute counts the total number of frames transmitted to the link for which underruns occurred. This count wraps to zero after reaching its maximum value.
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IPHost Network monitor allows you to monitor dataSigChanNisFramerUnderruns 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 secure routers right now.