Exercise $1$: Consider the signal containing the information and the clock signal. Represent the timing diagrams of the following codes:NRZ$,$ RZ$,$ NRZI, Single pole, HDB$3,$ Manchester $,$ Manchester differential, Miller

Exercise $2$: Or a synchronous static time multiplexer with $3$ input channels. Channel A debits at $1200$ bits$/$s$,$ channel B at $1200$ bits$/$s and channel C at x bits$/$s$.$ The bit rate on the composite channel is y bits$/$s$.$ We assume that channel A sends sequences of $\text{'}$A$\text{'},$ channel B sends sequences of $\text{'}$B$\text{'},$ channel C sends sequences of $\text{'}$C$\text{'}$ and we note that the sequences of characters which pass on the line are always in 'ABCC' order. What are the values of x and y in bits$/$s$?($The multiplexer in this case does not add any additional control elements$)."$

Exercise $3$:cable network has a bandwidth of $100$ MHz$.$ Applying the Nyquist criterion $,$ what is the speed in this medium $($speed$).$