With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
htdsOperationalState
htds Operational State
This attribute indicates the OSI Operational State of the component. The value enabled indicates that the component is available for operation. Note that if adminState is locked, it would still not be providing service. The value disabled indicates that the component is not available for operation. For example, something is wrong with the component itself, or with another component on which this one depends. If the value is disabled, the usageState must be idle. The OSI Status attributes, if supported by the component, may provide more details, qualifying the state of the component.
Back to Nortel-Magellan-Passport-HdlcTransparentMIB MIB page.
IPHost Network monitor allows you to monitor htdsOperationalState 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.