With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DtePacketSequencing
x25 Dte Packet Sequencing
1.3.6.1.4.1.562.2.4.1.90.21.1.4
This attribute specifies the sequence numbering of packets for the X.25 interface. The value of this attribute must be the same as the packet sequencing configured at the X.25 interface on the other side of the physical link.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DtePacketSequencing 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.