With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcModemOutbandBreak
gsm Bc Modem Outband Break
This attribute indicates whether inband or outband break control conversions are being performed. This is when the modem detects a break condition as defined by ITU-T X.28 and reports it. When a break condition is discovered all subsequent incoming data is discarded until a start bit is received.
Back to Nortel-Magellan-Passport-GsmIwfMIB MIB page.
IPHost Network monitor allows you to monitor gsmBcModemOutbandBreak 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.