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defined.

UBR – Unspecified Bit Rate, this is the default

category used for general-purpose Internet traffic

where normal levels of packet loss and delay are

acceptable. For some applications or for multiple

connection accounts, it may be 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).