With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteInActiveChannels
x25 Dte In Active Channels
1.3.6.1.4.1.562.2.4.1.90.28.1.15
This attribute indicates number of One-way Incoming Channels that are currently active.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteInActiveChannels 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.
