Consider a DLC system running Stop$-$and$-$wait protocol with the following parameters.

$<$#$>$ Packet size is $1250$ bytes including $25$ bytes of overhead

$<$#$>$ ACK packets are $25$ bytes long

$<$#$>$ Channel capacity $($speed$)$ is $1$Mbps $($Mega bits$/$sec$)$

$<$#$>$ Propagation delay $=0\mathrm{.}5$ms

$<$#$>$ Ignore the processing delay at both Tx & Rx

Calculate the channel efficiency $[3$ pt$]$

Re$-$do part$-$a for propagation delay of $5$ms & $50$ms $[4$ pt$]$

Re$-$do part$-$a if channel capacity is $1$Gbps $($Giga bits$/$sec$)[2$ pt$]$

Interpret these results $[2$ pt$]$

$(2)$ Re$-$do problem $1-$a for a bit$-$error rate of

$6$

$10$

$[2$ pt$]$

Re$-$do problem $1-$a for a bit$-$error rate of

$5$

$10$

$[2$ pt$]$