With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkUnAckedFramerUtilThresholdEntry
trk Un Acked Framer Utilization Threshold Entry
1.3.6.1.4.1.562.2.4.1.60.2.2.15.1
An entry in the trkUnAckedFramerUtilThresholdTable.
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IPHost Network monitor allows you to monitor trkUnAckedFramerUtilThresholdEntry 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 speech servers right now.