With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLapbT1AckTimer
x25 Dte Lapb T1 Ack Timer
1.3.6.1.4.1.562.2.4.1.90.5.10.1.6
This attribute specifies the period in milliseconds within which an acknowledgment of a sent frame must be received. The value set for t1 ack timer must be less than the value set for the t4 idle probe timer.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLapbT1AckTimer 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.