With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfLcnVcMaxSubnetPktSize
General Vc Interface Logical Channel Number Vc Max Subnet Packet Size
This attribute displays the maximum packet size allowed on Vc.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfLcnVcMaxSubnetPktSize 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 modems right now.