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# TeleComm question

Ranch Hand
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Who know how to do the following?
I really can't get any idea.
Thank you very much.

2. The propagation delay is the time required for the energy of a signal to propagate from one point to another

a)Find the propagation delay for a signal traversing the following networks at the speed of light in cable (2.3x108 meters/second):

a circuit board10 cm
a room10 m
a building100 m
a metropolitan area100 km
a continent5000 km
up and down to a geostationary satellite2x36,000 km

b)How many bits are in transit during the propagation delay in the above cases if bits are entering the above networks at the following transmission speeds: 10,000 bits/sec; 1 megabit/second; 100 megabits/second; 10 gigabits/second

3. In problem 2, how long does it take to send an L-byte file and to receive a 1-byte acknowledgment back ? Let L = 1, 103, 106 and 109 bytes.

lowercase baba
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ummm... isn't this just like saying

a car travels at 30 miles/hour. how long will it take it to travel:

100 feet?
5 miles?
200 miles?

for part b, if i know it takes 2 seconds, and i send 10,000 bits/second, doesn't that mean there will be 20,000 bits in transit?

Ranch Hand
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Originally posted by fred rosenberger:

for part b, if i know it takes 2 seconds, and i send 10,000 bits/second, doesn't that mean there will be 20,000 bits in transit?

[/QB]

That's some fancy math there, fred.

Ranch Hand
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Wow, homework assignments in MD. This is a first.

 With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.