This reports the size, in cells, of the output buffer dedicated to the NRTS processor's scheduled traffic. This buffer size effectively caps how much non-real-time traffic burst the NRTS scheduler can absorb before it starts discarding, so an admin seeing NRTS-related discards under bursty NRT traffic conditions should check this fixed hardware limit before assuming a software misconfiguration. For example, a burst of multicast NRT traffic exceeding cardNrtsOutCellBufSize in size will overflow the buffer and get discarded regardless of how the shaping rates are tuned.