Twenty voice signals are to be multiplexed and transmitted over twisted pair. What is the bandwidth required (in bps) if synchronous time division multiplexing is used, along with the standard analog-to-digital sampling rate, and each sample is converted into an 8-bit value?
(Hint: Each voice channel has a bandwidth of 4000 Hz. The Nyquist rule suggests the minimum sampling rate required equal to twice the highest frequency contained within the signal. )
Provide your computing process in details with explanation. Or partial grade cannot be given if your final answer was wrong.