With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnPortDlcType
appn Port Dlc Type
1.3.6.1.2.1.34.4.1.1.4.1.1.4
Type of the DLC interface used by this port. Possible values are: sdlc - synchronous data link control x25 - QLLC logical link control tokenRing - IEEE 802.2 logical link control frameRelay - RFC1490 and IEEE 802.2 logical link control other - dlc type other than those listed above.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnPortDlcType 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.