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6212-A2-GB20-00 May 2004 61
Service Type:
cbr (Constant Bit
Rate)
rtvbr (Real Time
Variable Bit Rate)
Nrtvbr (Non-Real
Time Variable Bit
Rate)
Ubr (Unspecified Bit
Rate)
Supports real-time applications requiring a fixed amount
of bandwidth. The applications produce data at regular
intervals such as a video stream. The user can specify how
much bandwidth they wish to reserve.
Supports time-sensitive applications such as voice. In
these applications the rate at which cells arrive are varied.
Supports applications that have no constraints on delay
and delay variation, but still have variable-rate and bursty
traffic characteristics.
Best effort service that does not require tightly constrained
delay and delay variation. UBR provides no specific quality
of service or guaranteed throughput.