With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frUniSigWindowSize
Frame Relay Uni Sig Window Size
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.
Back to Nortel-Magellan-Passport-FrameRelayUniMIB MIB page.
IPHost Network monitor allows you to monitor frUniSigWindowSize 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.