With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteMaxActiveChannels
x25 Dte Max Active Channels
1.3.6.1.4.1.562.2.4.1.90.21.1.2
This attribute specifies the maximum number of channels that can be active on this interface including the Permanent Lcns and the Switched Lcns. In total maxActiveChannel will determine the maximum number of Lcn components which may exist at a given time. This should be set to a value greater or equal to the numberOfPLcn provisioned.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteMaxActiveChannels 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.