4-6 Running other TroubleShooter tests
• CRC Error
Indicates the number of packets with CRC (Cyclic Redun-
dancy Check) errors received from the network by the
adapter. When a packet is transmitted, a mathematical cal-
culation is done on the header and data and is appended to
the end of the frame. The receiver of the packet performs
the same computation. If the computations are not equal,
the packet is discarded and a CRC error is issued.
• Frame Alignment Error
Number of misaligned packets received from the network
by the adapter. An Ethernet frame is misaligned if it does
not end in an 8 bit boundary.
• FIFO Overrun Error
This error occurs when FIFO (First In First Out) is disabled
causing an overflow during reception. The reception of the
packet is aborted.
• Frame Lost Error
This error represents the number of lost frames received
from the network by the adapter.
• Receive Buffer Overwrite Error
This error occurs when the receive buffer is full due to
heavy network traffic.
• Sample Time
The time in seconds from test start to test completion.
• Bandwidth Utilization
Total bandwidth utilization of the network. If it is over
2 percent, it will effect the FIFO Overrun Error and Frame
Lost errors.
If a test fails
If a test fails, TroubleShooter displays an error message in the main
dialog box. The message generally consists of three parts:
• The name of the diagnostic test
• “Failed”
• A possible reason for the failure
Check the connections from your Macintosh to the Ethernet cable,
and repeat the tests.
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