This read-write Integer32 (0..2147483647) is the default CDVT (Cell Delay Variation Tolerance) applied to new real-time VBR (Variable Bit Rate) calls on the interface when no other value is negotiated. An administrator tunes this to control how much jitter in cell arrival timing the switch's traffic policing will tolerate for real-time VBR (Variable Bit Rate) connections before treating cells as non-conforming. For example, raising cwspDefaultCdvtRtVbr gives real-time VBR (Variable Bit Rate) calls more slack against bursty arrival timing at setup, reducing the risk that legitimate real-time VBR (Variable Bit Rate) cells get tagged as violating traffic contracts.