Nortel Passport 8600 Configuring page 208

208 Appendix A RMON alarm variables
Table 65 Alarm variables (continued)
Category Subcategory
314723-D Rev 01
Variable
dot3StatsDeferred
Transmissions
dot3StatsLate
Collisions
dot3StatsExcessive
Collisions
dot3StatsInternalMac
TransmitErrors
dot3StatsCarrierSense
Errors
dot3StatsFrameToo
Longs
Definition
A count of frames for which the first transmission
attempt on a particular interface is delayed because
the medium is busy. The count represented by an
instance of this object does not include frames
involved in collisions.
The number of times that a collision is detected on a
particular interface later than 512 bit-times into the
transmission of a packet; 512 bit-times corresponds to
51.2 microseconds on a 10 Mb/s system. A (late)
collision included in a count represented by an
instance of this object is also considered as a
(generic) collision for purposes of other
collision-related statistics.
A count of frames for which transmission on a
particular interface fails due to excessive collisions.
A count of frames for which transmission on a
particular interface fails due to an internal MAC
sublayer transmit error. A frame is only counted by
an instance of this object 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.
The number of times that the carrier sense condition
was lost or never asserted when attempting to
transmit a frame on a particular interface. The count
represented by an instance of this object is
incremented at most once per transmission attempt,
even if the carrier sense condition fluctuates during a
transmission attempt.
A count of frames received on a particular interface
that exceed the maximum permitted frame size. The
count represented by an instance of this object 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 obtained are, according to the conventions
of IEEE 802.3 Layer Management, counted exclusively
according to the error status presented to the LLC.