With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DtePleIndex
x25 Dte Ple Index
1.3.6.1.4.1.562.2.4.1.90.6.1.1.10
This variable represents the index for the x25DtePle tables.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DtePleIndex 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.