With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLapbKWindowSize
x25 Dte Lapb K Window Size
1.3.6.1.4.1.562.2.4.1.90.5.10.1.4
This attribute specifies the window size. This is the maximum number of unacknowledged sequenced frames that may be outstanding from or to this interface at any one time. A window size of greater than 7 is only valid when the sequence numbering of frames is modulo 128.
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IPHost Network monitor allows you to monitor x25DteLapbKWindowSize 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 switches right now.