With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
aal1CesMisinsertedCells
aal1 Ces Misinserted Cells
This attribute counts the number of AAL1 sequence violations which the AAL convergence sublayer interprets as misinserted cells, as defined by ITU-T I.363.1. This counter wraps when the maximum value is exceeded.
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IPHost Network monitor allows you to monitor aal1CesMisinsertedCells 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.