With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkUnAckedFramerStatsTable
trk Un Acked Framer Stats Table
1.3.6.1.4.1.562.2.4.1.60.2.2.13
This group contains the operational statistics data for a Unacknowledge Framer component.
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IPHost Network monitor allows you to monitor trkUnAckedFramerStatsTable 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.