With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vctVcfrFrmLossTimeouts
VC Tester Vcfr Frm Loss Timeouts
1.3.6.1.4.1.562.2.4.1.5130.5.12.1.9
This attribute displays the number of lost frame timer expiries. When this count is excessive, the network is very congested and packets have been discarded in the subnet.
Back to Nortel-Magellan-Passport-VcTesterMIB MIB page.
IPHost Network monitor allows you to monitor vctVcfrFrmLossTimeouts 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.