mscAtmIfCARtVbrShapeRecoupPolicy 1.3.6.1.4.1.562.36.2.1.114.3.3.100.1.87

This attribute specifies the shaping recoup policy for the rt-VBR service category. This is the policy which is used to recoup shaping opportunities which are lost when more than one connection schedules a cell for the same transmit opportunity. In this case, one connection is scheduled, and the cell from another connection is delayed by one cell time. This attribute affects how the transmit time is calculated for the next cell on the delayed connection. This attribute is ignored if this service category is not shaped. When the connection which was delayed schedules the next cell to transmit, it may calculate the time as a difference from either the previous actual cell transmit time, or the time when the previous cell should have been transmitted. Setting this attribute to maximumEfficiency results in each connection trying to recoup or regain delays in scheduling. The transmit time from the next cell is calculated from the time when the cell should originally have been sent. Cell delay variation (CDV) occurs in this case since the cells are sent with less than the shaping delay between them. However, in general the shaper recovers (recoups) lost opportunities and improves efficiency. Setting this attribute to minimumCdv results in connections not trying to recoup or regain any delays in scheduling. The transmit time for the next cell is calculated from the time when the previous cell was actually transmitted. This minimizes CDV, but results in missed cell opportunities.