With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcFramerUnderruns
gsm Bc Framer Underruns
This attributecounts the total number of frames transmitted to the link for which underruns occurred. The counter wraps when it exceeds the maximum value.
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IPHost Network monitor allows you to monitor gsmBcFramerUnderruns 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.