With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfRDnaMapSap
General Vc Interface R Dna Map Sap
This attribute specifies a SAP identifier on the LAN device identified by the mac.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfRDnaMapSap 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.