With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mpanlDlciABitStatusFromIf
mpanl Dlci A Bit Status From If
This attribute is the most recent A-Bit status received from the interface. It is an indication from the equipment attached to the interface on whether it is ready to accept data. Mpanl relays the A- Bit status from interface to the other end of the SPVC. When an inactive setting is received, Mpanl will discard any data offered from the subnet. When an active setting is received, Mpanl will try to relay all data offered from the subnet to the interface.
Back to Nortel-Magellan-Passport-MpaNetworkLinkMIB MIB page.
IPHost Network monitor allows you to monitor mpanlDlciABitStatusFromIf 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 speech servers right now.