With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniLtsPatHeaderLength
Frame Relay Nni Lts Pat Header Length
This attribute specifies the size of the frame relay header in bytes. Passport currently only supports a 2-byte header. Valid values are 0, 2, 3, 4. 0 indicates to use no header. That is, the frame will start with either the payload or rfc1490 header.
Back to Nortel-Magellan-Passport-FrameRelayNniMIB MIB page.
IPHost Network monitor allows you to monitor frNniLtsPatHeaderLength 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 multiplexers right now.