Dual-Speed Stackable Hubs User’s Guide
Master Hub Setup and Management62
frame delimiter is valid but less than 2 bytes are received. This type
of error may indicate noise on the line.
♦ Late Events
. This statistic counts collisions that occur at or after the
64th byte (octet) in the frame. A high count here may indicate that
delays on your Ethernet are too long, and you have either exceeded
the repeater count or cable length specified in the Fast Ethernet stan-
dard.
♦ Runt Frames
. This statistic counts frames shorter than the 64-byte
(octet) minimum defined by the Fast Ethernet standard. Runts are of-
ten caused by collisions.
♦ Collisions
. This statistic counts collisions on the Ethernet segment.
♦ FCS Errors
. This statistic counts otherwise valid frames that fail the
CRC check.
♦ Alignment Errors
. This statistic counts otherwise valid frames that
did not end on a byte (octet) boundary.
♦ Readable Frames
. This statistic counts valid frames.
♦ Multicast
. This statistic counts the number of good multicast packets
received. Multicast events are messages sent from one node to multi-
ple nodes on the segment.
♦ Broadcast
. This statistic counts the number of good broadcast pack-
ets received. Broadcast events are messages sent to all nodes on the
segment.
♦ Auto Partitions
. This statistic counts events where the port was par-
titioned off from the rest of the network due to excessive collisions or
cabling problems.
♦ DRM (Data Rate Mismatch)
. This statistic counts events where
there is a frequency mismatch between the received signal and the hub
internal clock. A high count in this field may indicate a hardware
problem in the hub or in an Ethernet interface.
