With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteNumberOfPLcn
x25 Dte Number Of P Logical Channel Number
1.3.6.1.4.1.562.2.4.1.90.21.1.3
This attribute specifies the number of Permanent Logical Channels that are supported on this X.25 interface (that is, the number of PermLcn components that may be provisioned at this interface). The PermLcn components use channel numbers starting from 1 and up to lowestILChannelNumber. A value of 0 for this attribute indicates that no Permanent Logical channels are supported on this X.25 interface.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteNumberOfPLcn 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.