Task specification Task 1 (10 marks) Assume four channels are multiplexed using synchronised TDM, shown in Figure 1(a). A and C are VoIP channels. Digital channel B has different output values, and channel D has constant output value. 1.1 Assume each amplitude is sampled using 8-bit, give the output of frames 1, 2 and 3. (3 marks) 1.2 Draw a diagram to show the detailed structure of each frame. (2 marks) 1.3 Discuss the process of multiplexing the four channels and how the transmission resource could be better utilized? (5 marks) Voltage (V) 9 8 7 6 5 4 3 210 Frame 1 | Frame 2 Frame 3 Frame 4 | < Frame n Frame 1 MUX Time (s) (b) Figure 1. Pulse Amplitude Modulation (PAM) of channels A, B, C and D.