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) We need to transmit 100 digitized voice channels using a pass band channel of 40 KHz. Given that each digitized voice channel has its data rate of 64 Kbps. What should be the ratio of bits/Hz if we use no guard band?

c) Answer the following question about a T-1line ( 1.544 Mbps ) that carries 24 voice channels each with a data rate of 64 Kbps:

What is the overhead (number of extra bits per second)?