With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
sigChanEQsigActiveDataChannels
sig Chan E Qsig Active Data Channels
1.3.6.1.4.1.562.2.4.1.115.2.16.1.3
This attribute indicates the number of channels that are currently carrying data. This does not include modem data.
Back to Nortel-Magellan-Passport-VnetEtsiQsigMIB MIB page.
IPHost Network monitor allows you to monitor sigChanEQsigActiveDataChannels 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.