PP Presentation
- let
- b= channel capacity (bps)
- l = frame size (bits)
- R=round-trip propagation time (sec)
- l/b=time to xmit a frame (sec)
- U=channel utilization (efficiency)
- In stop-and-wait, the line is busy for l/b seconds and idle for R seconds.
U
=
l
l
+
bR
=
1000
1000
+
50000
*
500
*
10
-
3
=
.
0384
=
1
-
500
520
if
l
=
bR
then
U
=
.
5
if
l
<
bR
then
U
<
.
5