a) Four channels, two with a bit rate of 400 Kbps and two with a bit rate of 200 Kbps, are to be multiplexed using multiple-slot TDM with no synchronization bits. Given that unit of multiplexing is 1 bit Hint: Split each 400 Kbps channel into 2 sub-channels of 200 Kbps (i) What is the size of an output frame in bits? (ii) What is the output frame rate? (iii) What is the duration of an output frame? (iv) What is the output data rate?

b) A network with bandwidth of 15 Mbps can pass only an average of 18,000 frames per minute with each frame carrying an average of 15,000 bits. What is the throughput of the network (in Mbps)

c)In a digital transmission, the sender clock is 0.2 percent faster than the receiver clock. How many extra bits per second does the sender send if the data rate is 1 Mbps?