This MIB module defines managed objects that facilitate to
monitor performance of any physical entity, which are listed in
the ENTITY-MIB (RFC 4133) entPhysicalTable.

The performance monitoring includes utilization, input/output
packet/byte rates, etc. This monitoring is through the
measurement periods of current, 1-minute, 5-minutes,
15-minutes.

The performance data calculation method would vary for each
entity for a specific interval, hence users of this MIB should
obtain the information using the object cepStatsAlgorithm for a
specific interval.

The performance statistics can be accumulated for the 1-minute,
5-minutes and 15-minutes (recommended) intervals. At any one
time, an agent maintains one current (incomplete) interval for
each interval type and up to 96 completed interval number. Fewer
than 96 interval number of data will be available if the agent
has been restarted within the last 24 hours for 15 minutes
interval, 8 hours for 5 minutes interval, and 1.36 hours for 1
minute interval.

There is no requirement for an agent to ensure fixed
relationship between the start of a one/five/fifteen minute
intervals and wall clock, however some agents may align the
fifteen minutes interval with quarter hours.

The following terminologies apply within the scope of this MIB.

o entity - Any physical entity which can support performance 
           monitoring as specified in this MIB

o Utilization - The ratio of current usage to the maximum 
                capacity the entity can handle

o Input - Communication channel where packets arrive on the
          entity

o Output - Communication channel where packets leave the entity

Acronyms
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SMA - Simple Moving Average