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Leased Lines - Bandwidth

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Hi just a quick question which is probably very simple.

How do you work out what kb per second you should be able to download at? I know with contended services this is somewhat varied but what about with an un contended leased line at say 1mb?

Is there some simple maths to work this out!

Thanks in advance
 
1Mb = 1024000~ bytes
1024000~ bytes / 8 bits
=128000
128K/sec

512k = 512000~ bytes
512000~ bytes / 8 bits
64k/sec
 
Last edited:
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" might be wrong but I think

8kbit = 1 kbyte
1024kbit/s= 125 kbyte/s"

Right and wrong.

The figure you quote is technically correct, however the true data throughput of a file transfer will be less than this as you have to take into consideration IP packet overhead. IE a data packet consists of several elements, the data (the file/web page you are downloading) but also packet headers. The packet header contains the source and destination IP address).

So you may for example be able to download at 128K bytes per sec over a 1meg leased line, however the data (mp3 file, web page etc) wont come down at that speed.

The easiest way to prove this is next time you download email, is to check the total size of the emails and cross reference the total against the total downloaded bytes that will be displayed under dial up networking. You should see a difference.

Patesy
 
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