With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLapbFramerNonOctetErrors
x25 Dte Lapb Framer Non Octet Errors
1.3.6.1.4.1.562.2.4.1.90.5.2.13.1.7
This attribute is the total number of frames that were non octet aligned.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLapbFramerNonOctetErrors 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 switches right now.