With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mpanlDlciABitReasonFromIf
mpanl Dlci A Bit Reason From If
This attribute provides the reason (if any) for an inactive status to be sent to the subnet. This reason is not applicable for an active status. A-Bit status reason description: The A-Bit status reason is notApplicable when the A-Bit status is active. The A-Bit status reason is remoteUserSignaled if the SPVC end point originating the A-Bit status has detected that the DLCI is inactive at the remote network through the LMI protocol. The SPVC end point must be running network site LMI protocol for this A-Bit status reason to be sent. The A-Bit status reason is remoteLmiError if the LMI protocol is down at the SPVC end point originating this A-Bit status reason. The A-Bit status reason is remoteLinkDown if the physical interface is disabled at the SPVC end point originating this A-Bit status reason. The A-Bit reason is vcDown if no A-Bit status has been received from the interface (i.e., no A-Bit status has been relayed).
Back to Nortel-Magellan-Passport-MpaNetworkLinkMIB MIB page.
IPHost Network monitor allows you to monitor mpanlDlciABitReasonFromIf 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.