The Communication Model: The fundamental purpose of a communications system is the exchange of data between two parties. The key elements of the model are:- Source: - This device generates the data to be transmitted; examples are telephones and personal computers. Transmitter Usually, the data generated by a source system are not transmitted directly in the form in which they were generated. Rather, a transmitter transforms and encodes the information in such a way as to produce electromagnetic signals that can be transmitted across some sort of transmission system. For example, a modem takes a digital bit stream from an attached device such as a personal computer and transforms that bit stream into an analog signal that can be handled by the telephone network. Transmission System . This can be a single transmission line or a complex network connecting source and destination. Receiver. The receiver accepts the signal from the transmission system and converts it into a ...