APC IP DSLAM User's Guide download pdf (Page 330)

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initialization of the management system, and at

other times as indicated by the value of

ifCounterDiscontinuityTime.

FCS Errors

A count of frames received on a particular

interface that are an integral number of octets

in length but do not pass the FCS check. This

count does not include frames received with

frame-too-long or frame-too-short error. The

count represented by an instance of this object

is incremented when the frameCheckError

status is returned by the MAC service to the

LLC (or other MAC user). Received frames for

which multiple error conditions pertain are,

according to the conventions of IEEE 802.3

Layer Management, counted exclusively

according to the error status presented to the

LLC. For interfaces operating at 10 Gb/s, this

counter can roll over in less than 5 minutes if it

is incrementing at its maximum rate. Since

that amount of time could be less than a

management station's poll cycle time, in order

to avoid a loss of information, a management

station is advised to poll the

dot3HCStatsFCSErrors object for 10 Gb/s or

faster interfaces. Discontinuities in the value of

this counter can occur at e-initialization of the

management system, and at other times as

indicated by the value of

ifCounterDiscontinuityTime.

Single Collision

Frames

A count of frames that are involved in a single

collision, and are subsequently transmitted

successfully. A frame that is counted by an

instance of this object is also counted by the

corresponding instance of the ifOutUcastPkts,

ifOutMulticastPkts, or ifOutBroadcastPkts, and

is not counted by the corresponding instance

of the dot3StatsMultipleCollisionFrames object.

This counter does not increment when the

interface is operating in full-duplex mode.

Discontinuities in the value of this counter can

occur at re-initialization of the management

system, and at other times as indicated by the

value of ifCounterDiscontinuityTime.

Multiple Collision

Frames

A count of frames that are involved in more

than one collision and are subsequently

transmitted successfully. 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 corresponding instance of the

dot3StatsSingleCollisionFrames object. This

counter does not increment when the interface

is operating in full-duplex mode. Discontinuities

in the value of this counter can occur at re-

initialization of the management system, and at

other times as indicated by the value of

ifCounterDiscontinuityTime.

Deferred Tx Frames

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.

This counter does not increment when the

interface is operating in full-duplex mode.

Discontinuities in the value of this counter can

occur at re-initialization of the management

system, and at other times as indicated by the

value of ifCounterDiscontinuityTime.

Late Collisions

The number of times that a collision is

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