$5$A$)$ Suppose nodes A and $B$ are attached to opposite ends of the cable with propagation delay of $12\mathrm{.}5$

ms$.$ Both nodes attempt to transmit at $t=0.$ Frames collide and after first collision, A draws $k=0$ and $B$

draws $k=1$ in the exponential back off protocol. Ignore the jam signal. At what time $($in seconds$),$ is

A$\text{'}$s packet completely delivered at B if bandwidth of the link is $10$ Mbps and packet size is $1000$

bits?

$5$B$)$ For the bit stream $011000000000000100110,$ sketch the waveforms for Manchester, bipolar AMI

and B$8$ZS$.$ Assume that the signal level for the preceding bit for NRZI was high; the most recent

preceding $1$ bit $($AMI$)$ has a negative voltage, and the most recent preceding $0$ bit $($pseudo ternary$)$

has a negative voltage.

$5$ C $)$ Represent the following signals using a time domain representation. Also, identify values of $3$

important characteristics of drawn signal.

i$)s(t)=8sin(4t+\frac{}{4})$

ii$)s(t)=2sin(2t+\frac{}{2})$