With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
swPatlRowStatus
Software Patl Row Status
1.3.6.1.4.1.1588.2.1.1.1.436.1.2
This variable is used to control the addition and deletion of individual values of the swPatlTable.
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IPHost Network monitor allows you to monitor swPatlRowStatus 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 switches right now.