With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
apsNearEndRxActiveLine
aps Near End Rx Active Line
This attribute indicates which near end line is active for receiving data from the far end.
Back to Nortel-Magellan-Passport-ApsMIB MIB page.
IPHost Network monitor allows you to monitor apsNearEndRxActiveLine 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.