With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mod Vcs Wins Table
This is the windowSize corresponding to the given packet size and throughput class. All Vcs using the windowSize matrix support large Vc windows
on both ends of the Vc, and support the signalling of the chosen Vc window size from the destination (called) end to the source (calling) end. This is the only matrix supported. The windowSize should be configured in the same way network wide, though it can be upgraded on a module by module basis. Vcs using the windowSize matrix will run properly if the matrices on different nodes differ since the Vc window is selected by the destination (called) side of the Vc.
Back to Nortel-Magellan-Passport-SubnetInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor modVcsWinsTable on Allied Telesis device via the SNMP protocol.
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Easy monitoring of modVcsWinsTable with IPHost tools