Consider a synchronous TDM system in which $6$ 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 is the bit rate of each input channel?

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.