Figure 11.3 suggests in a general way the call establishment process usingvirtual channels and virtual paths. The process of setting up a virtual path connection is decoupled from the process of setting up an individual virtual channelconnection:• The virtual path control mechanisms include calculating routes, allocatingcapacity, and storing connection state information.• To set up a virtual channel, there must first be a virtual path connection to therequired destination node with sufficient available capacity to support the virtual channel, with the appropriate quality of service. A virtual channel is set upby storing the required state information (virtual channel/virtual path mapping).
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