With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
htdsFramerOverruns
htds Framer Overruns
This attribute counts the total number of frames received from the link for which overruns occurred. This count wraps to zero after reaching its maximum value.
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IPHost Network monitor allows you to monitor htdsFramerOverruns 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.