ADC AVIDIA SWD4573I1 User Manual page 47

The following table lists traffic parameters that must be set when you configure ATM traffic
profiles.
Parameter Description
PCR0+1 The peak cell rate to apply to both
tagged and non-tagged cells, in cells
per second.
SCR0+1 The sustainable cell rate, or minimum
guaranteed transmission rate, to be
applied to all cells, in cells per second.
MBS0+1 The maximum burst size, or maximum
number of cells that can be transmitted
at the peak rate, in cells.
CDVT The maximum allowable Cell Delay
Variation Tolerance, or delay between
consecutive ATM cells, in cells per
second.
MaxCTD The Maximum Cell Transfer Delay, or
elapsed time between the transmission
of a cell and the receipt of that cell at its
destination, in microseconds.
CLR The maximum Cell Loss Ratio, or
number of lost cells divided by the total
number of transmitted cells.
In addition to traffic types and their related parameters, the concept of cell tagging is important
to understanding ATM traffic profiles. Cell tagging means the setting of the Cell Loss Priority
(CLP) bit in the ATM cell header to either 0 or 1. A CLP of 0 means that the cell cannot be
dropped to accommodate traffic congestion. A CLP of 1 means that the cell can be dropped to
manage traffic congestion. The Avidia system does not currently support traffic types that
differentiate between tagged and non-tagged cells, nor does the system tag cells that do not
conform to the quality of service contract.
Avidia System Configuration and Management User Manual
Chapter 3: Applications and Configuration Overview
Valid Range Applies to Traffic Types...
150-353,207 UBR, CBR, rt-VBR, nrt-VBR
150-353,207 rt-VBR, nrt-VBR
1-65,536 rt-VBR, nrt-VBR
150-080,000 UBR, CBR, rt-VBR, nrt-VBR
20-1,000 CBR, rt-VBR, nrt-VBR
5-12 CBR, rt-VBR, nrt-VBR
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