This read-write value sets the Cell Delay Variation Tolerance, in microseconds, for the first leaky-bucket policer governing this channel's CLP-0 and CLP-1 cells. It defines how much jitter in cell arrival timing the switch will tolerate before treating a cell as non-conforming to the PCR contract. A connection carrying bursty traffic from a jitter-prone source might need a larger bbChanUpcCDVT to avoid excessive false non-conformance flags at the GCRA1 policer.