- The focus of the exercise is concerned with the initial design stages of an engineering system (in this case a modem). Students should work to develop the main design features of the system and it is important to note that there is not a single ‘right answer’. You are expected to engage with the complex situation presented to you and decide what information you need to find and topics you need to learn about in order to develop the design effectively. As a starting point, you may consider the exercises you have done so far in the Digital Communications module. These are all relevant to the problem in hand, but you should also consider what else is important in the design of a digital communications system.