With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfDlciAbitTable
General Vc Interface Dlci Abit Table
This group contains the A-Bit status information for this Data Link Connection Identifier. A-Bit status information is only applicable for PVCs. For SVCs, the values of attributes under this group are all notApplicable.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfDlciAbitTable 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.