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D
S
TATISTICS
This appendix lists the terms that are used in the Repeater Statistics,
Unit Statistics and Port Statistics screens. There are suggestions for
courses of action to take, if required. In general, if repeater statistics
indicate a problem, try to isolate the source of the problem by
examining unit and then port statistics.
Alignment Errors An alignment error occurs if the last byte of the
frame is not received whole. The number of alignment errors should be
a very small percentage of the total data traffic.
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
operating correctly, check the cable and cable connections for breaks
or damage.
Auto Partitions The number of times the port or ports have
automatically partitioned. Autopartitioning occurs when excessive
(more than 64) consecutive collisions occur at a port.
Autopartitioned ports are automatically reconnected when the fault is
rectified. Frequent partitions can indicate that there is a problem in the
cabling between two units or a unit and an attached device. It can also
indicate that a device is faulty. Check the cabling at both the stack and
the devices connected to it.
Bandwidth Used (%) The percentage bandwidth used. This statistic
gives an indication of the general traffic level of the network.
Broadcast Frames The total number of broadcast frames seen at the
repeater, unit or port. Broadcast frames are frames that are addressed
to all MAC addresses (that is, all devices) on the network. The total
number of broadcast frames will normally be a small percentage of the
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