With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkPaPccntTable
trk Pa Pccnt Table
This attribute gives the total number of path clear requests this trunk has processed since its creation. This attribute provides five (5) values of this count, one for each path holdingPriority.
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IPHost Network monitor allows you to monitor trkPaPccntTable 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.