With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
dpnGateLinkType
dpn Gate Link Type
This attribute specifies the type of network link. If this attribute is provisioned to dedicated then the link is a dedicated network link to a DPN module. If this attribute is provisioned to dialIn then the link is connected to the DPN module through a public telephone network, on a dial line.
Back to Nortel-Magellan-Passport-DpnTrunksMIB MIB page.
IPHost Network monitor allows you to monitor dpnGateLinkType 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 multiplexers right now.