VBR

variable bit rate

VBR is an ATM service category that provides guaranteed low cell loss and low delay for applications such as video and frame relay, and is characterized by an on/off source with known, predictable transmission patterns. During the on period, cells are transmitted at the peak information rate. No cells are transmitted during the off period.

VBR supports VBR data traffic with average and peak traffic parameters.

VBR is intended for applications that generate bursty traffic at a rate that varies with time. There are two service categories in VBR. The first is rt-VBR and is used by real-time applications. The second one is nrt-VBR and is intended for non-real-time applications.

See also nrt-VBR and rt-VBR .