$11)$ Two stations $($A$)$ and $($B$)$ use selective$-$reject AR

frames of $100$ bits at a data rate of $10$ Mbps$.$ The twc

connected by a full duplex line of $10$ km long. Assume

$108$ m$/$s and a BER$=5$x$10-4$

The window size to achieve an efficiency of $80\%$ is:

$($a$)18$

$($b$)$

$17$

$($C$)$

$17\mathrm{.}68$

$($d$)17\mathrm{.}684$

$11\mathrm{.}1$

$($a$)$

$($b$)$

$($C$)$

$=$

Page $7$ of $16$

To decrease the buffer size, the frame size is halved.

efficiency of the line utilisation between stations A anc

$($a$)$ decrease $($b$)$ increase $($c$)$ stay the same $($d$)$ neitt

$11\mathrm{.}2$

$($a$)$

$($b$)$

$|($c$)$

$($c