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8 • Ethernet

ifOutUcastPkts, ifOutMulticastPkts, or ifOutBroadcastPkts, and is not counted by the corresponding instance
of the dot3StatsMultipleCollisionFrames object."

Multiple Collision Frames (dot3StatsMultipleCollisionFrames)

The number of successfully transmitted frames for which transmission is inhibited by more than one colli-
sion. A frame that is counted by an instance of this object is also counted by the corresponding instance of
either the ifOutUcastPkts, ifOutMulticastPkts, or ifOutBroadcastPkts, and is not counted by the correspond-
ing instance of the dot3StatsSingleCollisionFrames object."

SQE Test Errors (dot3StatsSQETestErrors)

A count of times that the SQE TEST ERROR message is generated by the PLS sublayer. The SQE TEST
ERROR message is defined in section 7.2.2.2.4 of ANSI/IEEE 802.3-1985 and its generation is described in
section 7.2.4.6 of the same document."

Deferred Transmissions (dot3StatsDeferredTransmissions)

The number of times for which the first transmission attempt is delayed because the medium is busy. This
number does not include frames involved in collisions.

Late Collisions (dot3StatsLateCollisions)

The number of times that a collision is detected later than 512 bit-times into the transmission of a packet. Five
hundred and twelve bit-times corresponds to 51.2 microseconds on a 10 Mbps system. A (late) collision
included in a count of late collisions is also considered as a (generic) collision for purposes of other collision-
related statistics.

Excessive Collisions (dot3StatsExcessiveCollisions)

The number of frames in which transmission failed due to excessive collisions.

Other Errors (dot3StatsInternalMacTransmitErrors)

The number of frames for which transmission fails due to an internal MAC sublayer transmit error. A frame is
only counted if it is not counted by the corresponding instance of either the dot3StatsLateCollisions object,
the dot3StatsExcessiveCollisions object, or the dot3StatsCarrierSenseErrors object. The precise meaning of the
count represented by an instance of this object is implementation-specific. In particular, an instance of this
object may represent a count of transmission errors on a particular interface that are not otherwise counted.

Carrier Sense Errors (dot3StatsCarrierSenseErrors)

The number of times that the carrier sense condition was lost or never asserted when attempting to transmit a
frame. The is incremented at most once per transmission attempt, even if the carrier sense condition fluctuates
during a transmission attempt."

Received Frames Too Long (dot3StatsFrameTooLongs)

The number of frames received that exceed the maximum permitted frame size. The count is incremented
when the frameTooLong status is returned by the MAC service to the LLC (or other MAC user). Received
frames for which multiple error conditions obtain are, according to the conventions of IEEE 802.3 Layer Man-
agement, counted exclusively according to the error status presented to the LLC."