In this dialog you describe the forecast demand in the market for the service, first in terms of the number of customers or connections, as a market penetration, and then the average load or traffic per customer or connection. Not all of the traffic inputs are required, depending on the type of service and the preferred formulation for calculating the results. The Distribution parameters allow the peak traffic to be inferred from the traffic volume, or vice versa; these contrasting approaches to the calculations are common choices for voice and data services, respectively. The pivotal Traffic Calculation input (see below) determines which inputs will drive the calculation, and which will be ignored.