With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnRtpRxInvalidSnaFrames
appn Rtp Rx Invalid Sna Frames
This attribute counts the number of invalid SNA frames received on this pipe.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnRtpRxInvalidSnaFrames 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.