Call Establishment Process
A Virtual path connection to the destination node must exist in order to set up a virtual connection.
The Virtual path in which the new virtual channel will be contained must have
- sufficient available capacity to support the virtual channel.
- sufficient capacity to support requested quality of service.
Virtual channel set up is done by storing the required state information - VC number/VP number mapping.
Control mechanisms for Virtual Paths include
- calculating routes.
- allocating capacity.
- storing connection state information.