This attribute is applicable and is displayed only for connections for
which the operational Tm abrConnectionType is displayed as
sourceDest or virtualSourceDest.
This attribute indicates the Allowed Cell Rate Decrease Time Factor
(ADTF) parameter for this connection.
ADTF is the time interval permitted between sending forward
Resource Management (RM) cells before the Allowed Cell Rate
(ACR) is decreased to initialCellRate. In other words, if the source
does not transit a forward RM cell for the period specified by adtf, it
reduces its ACR to the value of its initialCellRate.
For nailed-up connections, this attribute is determined by the
provisioned value of the acrDecreaseTimeFactor attribute. For
signalled connections, it is indicated in the ABR Additional
Parameters Information Element.