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DVA-G3340S User Manual Page 30 of 94 V1.00 AU
desirable to specify the PCR.
CBR – Constant Bit Rate, usually used in
circumstances where very low packet loss and
very low Cell Delay Variable (CDV) are
desirable.
VBR – Variable Bit Rate, usually used when
network traffic is characterized by bursts of
packets at variable intervals, and some
moderate packet loss and delay is acceptable.
This category is typically used for audio and
video applications such as teleconferencing. The
network must support QoS Class 2 to use VBR.
PCR
Peak Cell Rate – The PCR is inversely related to the
time interval between ATM cells. It is specified for all
three service categories (UBR, CBR and VBR) in
Kbps.
SCR
Sustainable Cell Rate – The SCR is defined for the
VBR service category. This is the rate that can be
sustained for “bursty”, on-off traffic sources. It is a
function of Maximum Burst Size (MBS) and the time
interval (between cells).