3Com 3C16630A User Manual page 100

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PPENDIX TATISTICS
value seen for unicast frames. A high level of broadcast frames can
adversely affect network performance.
Data Rate Mismatches The number of frames received by the
repeater, unit or port whose timing was outside the permitted
frequency range. This may indicate non-compliant or faulty devices on
your network.
Errors/10000 Packets The number of total errors per 10,000 packets
received by the repeater, unit or port. This statistic gives an indication
of the general health of the network. A sudden significant change in
the value of this parameter usually indicates a problem developing.
FCS Errors Frame Check Sequence (FCS) errors indicate that frames of
data are being corrupted. FCS errors are counted when incoming
frames fail the Cyclic Redundancy Check (CRC) test. The number of FCS
errors should be a very small percentage of the total data traffic.
Check the transceiver or adapter card of the device connected to the
port that is the source of the problem. If the card appears to be
operating correctly, check the cable and cable connections for breaks
or damage. Occasionally the problem may be caused by interference
from other cables or machinery.
Good Frames This is the total number of frames with no errors seen
by the repeater, unit or port. Examining this statistic regularly can help
you monitor your network's overall performance. Look for unusual
increases in traffic rate. This may indicate a potential problem, or help
you decide if a bridge is required on your network.
Good Octets This field shows the total number of octets (bytes)
received as part of good frames seen at the repeater, unit or port. The
total includes the header, data and CRC octets of each frame. The Good
Octets value allows you to calculate the throughput, in terms of bytes
per second, and the average frame size on your network.
Late Events A Late Event is an out of window collision, which may
occur if you have an 802.3 LAN that exceeds the maximum size as
defined by IEEE. A Late Event is also counted as a collision.
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