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In ATM networks, one of the
important requirements is low cell delay with constant bit rate of cell
delivery. This is the most important in delay-sensitive applications such as voice
communication, cannot produce long delays among their cells. Cell-delay
variations can occur at both source and destination sides.
In ATM networks, certain
algorithm is used to maintain the Constant Bit Rate (CBR).
Let Cn be the cell, to produce
the n number of delay variations, k be the constant rate at which cells are
delivered to users. The interval between two consecutive arriving cells is 1/k Let
tn be the time at which the nth cell is received. Then the variable delay for nth
cell is represented as, We assume c1 is the first cell and the second cell is
represented as,
* Increasing both the network
resources and the data rate at the user interface the celldelay variation can
be reduced. Because cells are small and fixed in size, their delay will be
lower at the network level.
* To avoid congestion in any
network resource allocation has to be controlled.
* The key factors that influence
traffic management in ATM networks are latency and cell delay variation.
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