Data Transfer Rate

Dell OPTIPLEX 745
October 16, 2009 at 13:52:35
Specs: Microsoft Windows XP Professional, 2.126 GHz / 3581 MB
I have a quick question....suppose the modulation scheme on the channel is quadrature modulation. Channel frequency is 10KHz. What is the maximum possible data transfer rate on this channel and how?

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#1
October 16, 2009 at 13:57:07
Sounds like another CCNE question.

I had this question on of my exams once but I can not remember the answer. I think it was 56 K buads.

http://www.ehow.com/how_5001664_cal...

http://forums.techguy.org/networkin...


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#2
October 16, 2009 at 14:17:07
LOL, it is a CCNE question, saw it in a book I have, trying to go over it but I need to answer it in detail.

I asked someone else and they gave me this response:

Shannon’s theorem (slide 22, lec. 2−2 and W, p.58) states that channel transfer rate is calculated as C = BW log2(1+S/N) where BW is the highest channel frequency, S/N is a ratio of signal-tonoise power. Using this theorem we have 20 = 3 log2(1 + S/N). Using definition of logarithm we obtain 220/3 = 1 + S/N, so S/N = 220/3 − 1 101.594 − 1 100.594.

Dude...crazy


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#3
October 17, 2009 at 06:01:42
You have to wonder who dreams up questions like this!?!?

suppose the modulation scheme on the channel is quadrature modulation. Channel frequency is 10KHz. What is the maximum possible data transfer rate on this channel and how

Here's your answer:

Who cares and where in real life could being able to calculate the data rate like that EVER come in handy.

I can't think of a single solitary instance where that bit of knowledge could be considered useful.

Maybe 10 or 15 years back...........but in today's world......NOT!

Someone really needs to update their training material!


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#4
October 17, 2009 at 18:35:46
Not really sure... :0/, sorry dude, just trying to get a response in detail, that's about it.

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#5
October 18, 2009 at 05:19:32
Oh I wasn't asking you........lol.........that was a comment on the stupidity of some of the questions trainers and course creators dream up. It never ceases to amaze me and almost always makes me wonder, "haven't these people ever worked in industry!?"

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