rt-VBR

real-time variable bit rate

rt-VBR is a variant of the VBR service category available only for VPC paths and VCC paths. It allows statistical multiplexing gains using the traffic descriptors (PCR and SCR), and provides delay commitments. rt-VBR supports variable bit rate traffic with sustained and peak traffic parameters, which require strict delay control, such as packetized voice or video.

An rt-VBR is an ATM service category that guarantees very low cell loss and very low delay for time-sensitive applications such as voice and video, which are characterized by unpredictable, bursty transmission patterns.

rt-VBR is a variant of the VBR service category that is only available for VPC and VCC paths. nrt-VBR is the other variant of VBR available for these paths.