With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mpanlDlciABitStatusToIf
mpanl Dlci A Bit Status To If
This attribute is the most recent A-Bit status sent to the interface. The A-Bit status is originated from the SPVC end point at the remote end of the Passport subnet and it is relayed to the interface by Mpanl. When an inactive setting is sent out, Mpanl will discard any data offered from the interface. When an active setting is sent out, Mpanl will try to relay all data offered from the interface to the other end of the SPVC.
Back to Nortel-Magellan-Passport-MpaNetworkLinkMIB MIB page.
IPHost Network monitor allows you to monitor mpanlDlciABitStatusToIf 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.