This value is the first reverse traffic descriptor parameter (typically peak cell rate in the reverse direction) for this failed call, per the description, the mirror of svcAtmFailedCallAtmTfdParam1 but describing bandwidth flowing back toward the calling party. This is relevant specifically for asymmetric applications where the reverse-direction bandwidth demand differs from the forward direction, so comparing this against the port's reverse-direction capacity is what determines whether this specific call was rejected for exceeding return-path bandwidth rather than forward bandwidth. A failed call with a very high reverse PCR alongside a modest forward PCR would suggest a heavy return-traffic application, like bulk downstream video.