| This attribute specifies three utilization thresholds used to trigger
the three degrees of adaptation. It is a vector indexed by (level1,
level2, and level3).
While the PORS adaptationLevel is zero (0),
- if the trunk utilization has exceeded the level1 value for the period
of time specified by the set value of adaptationHoldOffTime, the
first degree of adaptation is triggered. Meanwhile, the Trunk/n Pa
component generates a SET alarm indicating that the PORS
adaptation mechanism is active. The PORS adaptationLevel
increases to level one (1).
While the PORS adaptationLevel is one (1),
- if the trunk utilization has exceeded the level2 value for the period
of time specified by the set value of adaptationHoldOffTime, the
second degree of adaptation is triggered. The PORS
adaptationLevel increases to level two (2).
- Otherwise, if the trunk utilization has exceeded the level1 value
for an additional period of time specified by the set value of
adaptationHoldOffTime, the PORS adaptationLevel remains
unchanged.
- Otherwise, if the trunk utilization has subsequently fallen back to
a level at or below the level1 value for the period of time specified
by the clear value of adaptationHoldOffTime, new calls are allowed
to be established over the parent trunk. Meanwhile, the Trunk/n Pa
component generates a CLEAR alarm indicating that the PORS
adaptation mechanism is no longer active. The PORS
adaptationLevel decreases to level zero (0).
While the PORS adaptationLevel is two (2),
- if the trunk utilization has exceeded the level3 value for the period
of time specified by the set value of adaptationHoldOffTime, the
third degree of adaptation is triggered. The PORS adaptationLevel
increases to level three (3).
- Otherwise, if the trunk utilization has exceeded the level2 value
for an additional period of time specified by the set value of
adaptationHoldOffTime, the second degree of adaptation is
triggered again, and the PORS adaptationLevel remains unchanged.
- Otherwise, if the trunk utilization has subsequently fallen back to
a level at or below the level2 value for the period of time specified
by the clear value of adaptationHoldOffTime, the PORS
adaptationLevel decreases to level one (1).
While the PORS adaptationLevel is three (3),
- if the trunk utilization has exceeded the level3 value for an
additional period of time specified by the set value of
adaptationHoldOffTime, the third degree of adaptation is triggered
again, and the PORS adaptationLevel remains unchanged.
- Otherwise, if the trunk utilization has subsequently fallen back to
a level at or below the level3 value for the period of time specified
by the clear value of adaptationHoldOffTime, the PORS
adaptationLevel decreases to level two (2).
For a Trunk/n with an Unack subcomponent, the link receive
utilization (indicated by utilization of Trunk/n) is monitored against
the thresholds. Since the trunk application solely owns the physical
link, the maximum link receive utilization is 100%. The restrictions
on the setting of the three thresholds are:
- when maxAdaptationLevel is 1, the value of (level1) must be in the
range of 0% to 100%.
- when maxAdaptationLevel is 2, the values of (level1 and level2)
must be the range of 0% to 100%, and the value of level1 must be
less than or equal to the value of level2.
- when maxAdaptationLevel is 3, the values of (level1, level2, and
level3) must be in the range of 0% to 100%, and the value of level1
must be less than or equal to the value of level2, which must be less
than or equal to the value of level3.
For a Trunk/n with an AtmAccess subcomponent, the aggregation of
transmit VCCs utilization (indicated by utilization of Trunk/n), VP
utilization, and PORT utilization (normal port or IMA port if Ima is
used) is monitored against the thresholds. Since the trunk
application shares a physical link with other applications, both the
VCCs and VP utilizations can exceed 100%, and the value 200% is
chosen as the maximum calculated utilization for VCCs and VP, so
all thresholds can take on any value in the range of 0% to 200%.
The restrictions on the setting of the three thresholds are:
- when maxAdaptationLevel is 2, the value of level1 must be less
than or equal to the value of level2.
- when maxAdaptationLevel is 3, the value of level1 must be less
than or equal to the value of level2, which must be less than or
equal to the value of level3. |
