With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
shelfBusClockSourceStatusIndex
shelf Bus Clock Source Status Index
1.3.6.1.4.1.43.1.12.3.1.1.2.3.247.1.1
This variable represents the shelfBusClockSourceStatusTable specific index for the shelfBusClockSourceStatusTable.
Back to Nortel-Magellan-Passport-ShelfMIB MIB page.
IPHost Network monitor allows you to monitor shelfBusClockSourceStatusIndex 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.