With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxFramerLargeFrmErrors
Frame Relay Mux Framer Large Frm Errors
1.3.6.1.4.1.1570.1.2.13.1.10
This attribute is the total number of frames received which were too large. The frame execeeded the maximumFrameLengthLimit provisioned attribute or it contained more than the 255 block hardware limit.
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IPHost Network monitor allows you to monitor frMuxFramerLargeFrmErrors 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 secure routers right now.