Description: This attribute specifies the maximum time that a cell may arrive late, compared to a nominal time established at buffer initialization, without producing errors on the service interface. The nominal time of a cell's arrival is predicted according to the time interval required to transmit a cell's worth of data on the service interface.

This attribute's value is the delay that the Cell Delay Variation Tolerance buffer adds to the egress stream immediately after the buffer initializes. The buffer absorbs variation in the arrival time of cells from the network, so that a steady stream of data appears on the service interface. If the buffer underflows, due to a late cell, fill- in data is output on the service interface while the buffer re- initializes. When the buffer has re-initialized, normal data is output on the service interface and the delay in the buffer is restored to the value of this attribute.

This attribute must have a value lower than a numeric value of maximumBufferDelay. The relationship between this attribute and bufferSize is described under that attribute.

Setting this attribute too low allows traffic with normal CDV to cause unnecessary loss of data on the service interface. Setting this attribute too high imposes an unnecessarily high propagation delay on the egress stream.

On MSA cards this attribute's provisionable range is 0.01..32ms and the value applied is rounded up to the nearest multiple of 0.125ms.

On 4pDS1Aal1 and 4pE1Aal1 cards, this attribute's provisionable range is strongly dependent on the bandwidth of the channel, and the value applied is rounded up to the nearest whole number of milliseconds, then rounded down to the equivalent number of cells.