The is stage involves determining where to place the components and how to connect them. The (topological) optimisation methods that can be used in this stage come from an area of mathematics called Graph Theory. These methods involve determining the cost of transmission and the cost of switching, thereby determining the optimum connection matrix and location of switches and routers.
This stage involves determining the size of the components used, subject to performance criteria, such as the Grade of Service (GoS). This method used is known as Nonlinear Optimisation and involves determining the topology, required GoS, cost of transmission etc. Using this information to calcualte a routing plan and sizeof components.
This stage involves determining how to meet capacity requirements and ensure reliability within the network. The method used is known as Multi commodity Flow Optimisation and involves determining all information relating to demand, cost and reliability. Then using this information to calculate an actual physical circuit plan.
Once all of the requirements have been decided, we can produce an efficient network that will allow growth and be robust against intrusion, so that your network works at optimum speed in a safe environment.