The value of tAdvCfgDecOnly specifies the tAdvCfgTimeAvgFactor
adjustment to be applied if the new offered rate is decreasing compared
to the previous offered rate. If the new offered rate is greater than
the previous offered rate, the adjustment is not applied.
When the tAdvCfgDecOnly is set to 'false', it has no impact on
tAdvCfgTimeAvgFactor adjustment.