With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkUnAckedIndex
trk Un Acked Index
1.3.6.1.4.1.562.2.4.1.60.2.1.1.10
This variable represents the index for the trkUnAcked tables.
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IPHost Network monitor allows you to monitor trkUnAckedIndex 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 multiplexers right now.