With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnMemCriticalThreshold
appn Memory Critical Threshold
This attribute represents the memory allocation threshold beyond which storage management considers the storage resources to be critically constrained. The value is calculated as a fraction of heapSpaceLimit. The value returned now is always zero until the functionality is supported in future release.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnMemCriticalThreshold 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 modems right now.