Consider a synchronous TDM system in which 5 input channels are multiplexed into a 125-microsecond output frame. Each output frame includes exactly four bits from each input source, plus one synch bit per frame.

a) What is the size of each output frame in bits?

b) What is the total bit rate of the output line?

c) What percentage of the output data rate constitutes overhead?

d) Suppose we would like to replace one of the input sources with a new source that has a data rate of 24 Kilobits per seconds. Calculate how many extra bits must be stuffed for this source in each output frame.