3Com 3C16685 User Manual page 58

58 C 3: U C L I
HAPTER SING THE OMMAND INE NTERFACE
operating correctly, check the cable and cable connections for
breaks or damage.
Frames Too Long — These are frames that exceed the
maximum size for Ethernet frames (1518 octets). If you see a high
number of such frames you will need to isolate the source of
these frames and examine the transceiver or adapter card at the
device.
Short Events — Short events are smaller than runt frames
and are errors. They may indicate externally generated noise
causing problems on the network. Check the cable routing and
re-route any cabling which may be affected by external noise
sources.
Runts — Runt frames are frames that are smaller than the
minimum frame size defined for Ethernet frames, but are longer
than Short Events. Runts may occur as the result of collision, and
will be propogated around the network. This is a normal part of
Ethernet operation and is not an error.
Collisions — Collisions are a normal part of Ethernet
operation and occur if two devices attempt to transmit at the
same time. A sudden sustained increase in the number of
collisions may indicate a problem with a device or cabling on the
network, particularly if this is not accompanied by a general
increase in traffic.
Late Events — A late event is an 'out-of-window' collision,
which may occur if you have a network that exceeds the
maximum size (defined by IEEE Ethernet standards). A late event
is also counted as a collision.
Very Long Events — The very long event statistic shows how
many times the hub has had to protect against jabbers seen at a
port. Isolate the source of very long events and check that the
transceiver or adapter card in the device is operating correctly.
Data Rate Mismatches — These are frames received at the
port whose timing was outside the permitted frequency range.
This may indicate non-compliant or faulty devices on your
network.
Autopartitions — This is the number of times the port has
automatically partitioned. Autopartitioning occurs when excessive
(more than 64) consecutive collisions occur at a single port.