With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcV42CrcErrorsRx
gsm Bc V42 Crc Errors Rx
This attribute counts the total number of frames received from the remote Public Switched Telephone Network (PSTN) modem that contain incorrect frame check sequence. A high value signifies the condition of the physical medium is poor. The counter wraps when it exceeds the maximum value.
Back to Nortel-Magellan-Passport-GsmIwfMIB MIB page.
IPHost Network monitor allows you to monitor gsmBcV42CrcErrorsRx 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.