Specifications

9031035 E4 Ethernet Applications
4-15
Ethernet Applications
Monitor Ether Application
Runts
A carrier-sense event that lasts longer than 7.4 microseconds but less than 8.2
microseconds increments either the hmMonPortShortEvents counter or this
counter, but not both. A carrier-sense event that lasts at least 8.2 but not
longer than 63.2 microseconds increments this counter. A carrier-sense event
that does not result from a collision and that lasts longer than 63.2 but less
than 64.0 microseconds increments either this counter or the
hmMonPortLateCollisions counter, but not both.
FCS Errors
The number of frames that are an integral number of octets and do not pass
the Frame Check Sequence (FCS) Error check.
Alignment
The number of frames received on this port that are not an integral number of
octets in length.
Too Longs
The number of frames received that are greater than 1518 octets.
OOR
The number of frames with a length field whose value is greater than the
maximum value allowed for LLC frames (1500 or 5DC hex). This could be
used to count Ethernet frames (length fields whose values are 600 hex or
greater).
Collisions
The number of times this port had transmit and receive active concurrently.
Note that the sum of all port collisions in a group is not necessarily
ubHmMonGroupCollisions.
Late Collisions
The number of times this port detects a collision later than 512 bit times and
relays it into the transmitted packet.
Late Col
Counts the number of times any port in this group had transmit and receive
action concurrently but late. Simultaneous late collisions on multiple ports
are counted as only one group late collision.
AutoPart.
Indicates whether a port has been automatically partitioned by the hub’s
auto-partition protection; this happens if a port signals continuous collision or
there are greater than 30 consectutive collisions on the port.
DR Mismatch
The number of times a packet has been received with the transmission
frequency (data rate) detectably out of spec. This count may include repeated
packets.
SFD Errors
The number of times this port detects a double-zero before a start-frame
delimiter.