With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frAtmDlciDiscByteAbit
Frame Relay Atm Dlci Disc Byte Abit
This attribute counts the bytes number of which were discarded due to the A-bit being turned off. When the maximum count is reached, the count wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayAtmMIB MIB page.
IPHost Network monitor allows you to monitor frAtmDlciDiscByteAbit 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.