$($a$)$ Explain how stop$-$and$-$wait ARQ error control scheme handles each of the following:

$($i$)$ damaged data frames;

$($ii$)$ lost data frames;

$($iii$)$ Lost ACK frames.

$(6$ marks$)$

$\frac{2602}{305}$

$2$

Oct.$/$Nov$.2023$

$($b$)$ Table $2$ shows frames of a byte oriented data link control protocol.

Table $2$

Determine the:

$($i$)$ transverse parity bits for odd parity;

$($ii$)$ longitudinal parity bits for even parity

$(6$ marks$)$

$($c$)($i$)$ Distinguish between a mark and a space as used in encoding schemes.

$($ii$)$ A data word $1000001100001$ is to be encoded. Draw the resultant waveforms for each of the following encoding schemes:

$($i$)$ Bipolar AMI;

$($ii$)$ High density bipolar $3(HD{B}_3).$

$(8$ marks$)$