With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
aal1CesPepLastTearDownCause
aal1 Ces Pep Last Tear Down Cause
lastTearDownCause indicates the cause of the last connection tear down. The values are as defined in the ATM Forum ATM User- Network Interface (UNI) Specification.
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IPHost Network monitor allows you to monitor aal1CesPepLastTearDownCause 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.