This is the reverse-direction counterpart to cktAbrICR, reporting the ABR initial cell rate for traffic flowing in the reverse direction of this SVC. Because ABR connections are typically bidirectional with independently negotiated forward and reverse rate parameters, this lets the switch (and the admin inspecting it) confirm the reverse leg was granted an appropriate starting rate rather than assuming symmetry with the forward direction. An engineer investigating a slow return path on an otherwise fast ABR SVC would compare cktRAbrICR against cktAbrICR to see if the reverse direction started with a much lower initial rate.