With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trkPaMaxReservableBwOut
trk Pa Max Reservable Bw Out
This attribute gives the total bandwidth that this PathAdmin is allowed to reserve. This number is computed by multiplying the parent trunk's measuredSpeedToIf attribute by the maxReservedBwOut provisionable attribute of this PathAdmin.
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IPHost Network monitor allows you to monitor trkPaMaxReservableBwOut 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.