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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
What is the total delay (latency) for a frame size of 10 million bits that is being set up on a link with 20 routers, each having a queuing time of 2 μs and a processing time of 1 μs? The length of link is 5000 km. The speed of light inside the link is $2\times10^8$ m/s. The link has bandwidth of 6 Mbps.
Solution
Transmission delay
$= \frac{\text{Frame size}}{\text{Bandwidth}}$
$= \frac{10\times10^6}{6\times10^6}$
$= 1.6667\ s$
Propagation delay
Distance $=5000\ km =5\times10^6\ m$
$= \frac{5\times10^6}{2\times10^8}$
$=0.025\ s$
Router delay
Each router delay $=2\mu s+1\mu s=3\mu s$
Total routers $=20$
Total delay $=20\times3\mu s=60\mu s=0.00006\ s$
Total latency
$=1.6667+0.025+0.00006$
$\approx1.691726\ s$
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