3Com 3C16685 User Manual page 57

Commands 57
The screen shows the following statistics:
Good Frames — This is the total number of frames with no
errors seen at the port. Examining this statistic regularly can help
you monitor your network's overall performance. For example
unusual increases in traffic rate may indicate a potential problem.
Good Octets — This field shows the total number of octets
(bytes) received as part of Good Frames at the port. The total
includes the header, data and FCS (Frame Check Sequence) 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.
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). If
the number of FCS errors is a large 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.
Alignment Errors — The alignment errors count is the
number of frames that are not a whole number of octets in
length and do not pass the FCS check. Alignment errors are likely
to be caused by a fault at the transmitting device. 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