With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpTbsgUpTime
Virtual Router Passport Tbsg Up Time
This attribute specifies the accumulated up time of this bridge port since the last reset occurred.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpTbsgUpTime 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.