Nortel 8100 用户指南

314723-D Rev 01

 

dot3StatsDeferred
Transmissions

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.

dot3StatsLate
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.

dot3StatsExcessive
Collisions

A count of frames for which transmission on a 
particular interface fails due to excessive collisions.

dot3StatsInternalMac
TransmitErrors

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.

dot3StatsCarrierSense
Errors

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.

dot3StatsFrameToo
Longs

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.

Table 65   Alarm variables (continued)