With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLowestTLChannelNumber
x25 Dte Lowest TL Channel Number
1.3.6.1.4.1.562.2.4.1.90.22.1.3
This attribute specifies the lowest Lcn number of the Two-way Channel range for this X.25 interface. The value for this attribute must be greater than the highestILChannelNumber attribute.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLowestTLChannelNumber 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 secure routers right now.