With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteOutWindowSize
x25 Dte Out Window Size
1.3.6.1.4.1.562.2.4.1.90.23.1.4
This attribute specifies the maximum transmit window size for the X.25 interface. A window size greater than 7 is only valid when the packetSequencing is set to modulo128.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteOutWindowSize 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.