User guide

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Configure
VBR has two sub-classes:
a. VBR non-real-time (VBR-nrt): Typical applications are non-real-time traffic, such as IP
data traffic. This class yields a fair amount of Cell Delay Variation (CDV).
b. VBR real time (VBR-rt): Typical applications are real-time traffic, such as compressed
voice over IP and video conferencing. This class transmits cells with a more tightly
bounded Cell Delay Variation. The applications follow CBR.
☛ Note:
The difference between VBR-rt and VBR-nrt is the tolerated Cell Delay Varia-
tion range and the provisioned Maximum Burst Size.
Class PCR SCR MBS Transmit Priority Comments
UBR X N/A N/A Low PCR is a cap
CBR X N/A N/A High PCR is a guaranteed rate
VBR X X X High PCR > SCR.
SCR is a guaranteed rate.
PCR is a cap.