With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkUnAckedFramerLrcErrors
trk Un Acked Framer Lrc Errors
1.3.6.1.4.1.562.2.4.1.60.2.2.13.1.6
This attribute is the total number of frames with LRC errors.
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IPHost Network monitor allows you to monitor trkUnAckedFramerLrcErrors 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 modems right now.