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* In ATM networks, the main
resource management is to use all virtual paths properly
* Number of Virtual Channel
Connections (VCC) are grouped into Virtual Path Connection (VPC).
* It provides equal capacity to
all virtual channels within virtual path.
* The traffic management in ATM
networks having different parameters are cell-loss ratio, cell-transfer delay
and cell-delay variation.
* The performance of virtual
channel depends on the performance of virtual paths
* There are two types of
approaches to resource allocation for virtual paths.
* In the first approach, the ATM
network can set capacity of the virtual paths to meet the peak data rates for
all VCCs, within a VPC. However, the number of resources are wasted.
* The second approach, an ATM
network can set the capacity of VPC to be greater than or equal to the average
capacity of all VCCs.
Connection Admission
Control
An ATM network accepts the
connection only if it meets the QoS requirements. Once the network accepts
connection, the user and the network enter into the traffic contract.
The traffic contract can be
characterized as four parameters
o Peak Cell Rate
o Cell Delay Variation
o Sustainable Cell Rate
o Burst Tolerance
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