With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
traceRcvrX25DnaDefaultSendToNetworkPacketSize
trace Receiver X25 Dna Default Send To Network Packet Size
1.3.6.1.4.1.562.2.4.1.106.2.2.2.13.1.4
This attribute specifies the default local send packet size from DTE to network for all calls using this particular Dna.
Back to Nortel-Magellan-Passport-X25TraceRcvrMIB MIB page.
IPHost Network monitor allows you to monitor traceRcvrX25DnaDefaultSendToNetworkPacketSize 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.