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24-port NWay Ethernet Switch User’s Guide
Web-Based Network Management 171
♦ Fragments The number of packets less than 64
bytes with either bad framing or an invalid CRC.
These are normally the result of collisions.
♦ Jabber The number of frames with length more
than 1518 bytes and with CRC error or
misalignment (bad framing).
♦ Late Collision Counts collisions that occur at or
after the 64
th
byte (octet) in the frame. This may
indicate that delays on your Ethernet are too long,
and you have either exceeded the repeater count or
cable length specified in the Ethernet standard.
♦ MAC Received Error Counts data errors detectable
as 10BASE-TX “symbol errors,” bit patterns with
illegal encodings. This may indicate noise on the
line.
♦ Dropped Frames The number of frames which are
dropped by this port since the last Switch reboot.
♦ Undersize Frames The number of frames detected
that are less than the minimum permitted frame
size of 64 bytes and have a good CRC. Undersize
frames usually indicate collision fragments, a
normal network occurrence.
♦ Total Errors The sum of the CRC Error, Oversize
Frames, Fragments, Jabber, Late Collision, MAC
Received Error, Dropped Frames, and Undersize
Frames counters.
♦ Collisions The best estimate of the total number of
collisions on this Ethernet segment.