1a) Each analog signal (A and C) is digitized using 8-bit Pulse Code Modulation (PCM). Give the PCM output of Frame 2 and Frame 3.

b) Discuss resource utilization of the multiplexed channels. (hint: source C stops transmitting at the 3rd frame, and D stops transmitting at the 4th frame as shown in Fig.1).

Assume a Time Division Multiplexing (TDM) multiplexer combines four sources, A, B, C and D using a synchronization time slot of 1 byte, with one extra framing bit for synchronization. Channels A and C are analog signals with different frequencies; Channel B is digital signal with different output values; and Channel D is digital signal with constant output value. The Pulse Amplitude Modulation (PAM) of four cycles is shown in Figure 1 Voltage (V) 5-4 2 Frame 1 Frame 2Frame 3 Frame 4 Time (s) Figure 1. Pulse Amplitude Modulation (PAM) of channels A, B, C and D Assume a Time Division Multiplexing (TDM) multiplexer combines four sources, A, B, C and D using a synchronization time slot of 1 byte, with one extra framing bit for synchronization. Channels A and C are analog signals with different frequencies; Channel B is digital signal with different output values; and Channel D is digital signal with constant output value. The Pulse Amplitude Modulation (PAM) of four cycles is shown in Figure 1 Voltage (V) 5-4 2 Frame 1 Frame 2Frame 3 Frame 4 Time (s) Figure 1. Pulse Amplitude Modulation (PAM) of channels A, B, C and D