1. Sketch the simplified block diagram of data Communication model for sending a text messages data between two computer as shown in FIGURE Q2 .Briefly explain the operation of system. Text Source Digital bit stream Input data g(1) Trans- mitter Analog signal Trans- mission system Transmitted Input information signal m s(t) Figure 1.4 Simplified Data Communications Model Analog signal 4 Received signal r(1) Receiver Digital bit stream Text Destination 6 Output data 8' (1) Output information m' FIGURE Q2 2. With a help of block diagram, explain the operation of Asynchronous Transfer Mode (ATM) packet switching system.