With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mcsMgrFrf5EpGEpLmiLinkVerificationTimer
mcs Manager Frf5 Ep G Ep Lmi Link Verification Timer
This attribute specifies how frequently the FRF.5 LMI initiates a Status Enquiry for link integrity verification. It must be less than checkPointTimer (t392).
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IPHost Network monitor allows you to monitor mcsMgrFrf5EpGEpLmiLinkVerificationTimer 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.