With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
shelf Card Bus Tap Frm Timeout Errors
This attribute records the number of times that the bus tap was unable to receive a frame from the bus because the delay between two successive cells in that frame exceeded the maximum allowable duration. Each occurrence results in the loss of the frame. This type of event may occur during normal operation of the module, for example when the module changes bus mode; it may also be caused by a hardware fault. The attribute's value wraps around to zero when it exceeds the maximum permitted value.
Back to Nortel-Magellan-Passport-ShelfMIB MIB page.
IPHost Network monitor allows you to monitor shelfCardBusTapFrmTimeoutErrors on Allied Telesis device via the SNMP protocol.
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Easy monitoring of shelfCardBusTapFrmTimeoutErrors with IPHost tools