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3Mbps is how many KB/s?

greenmeansgoooo 13,930 3,398 October 28, 2010 at 05:08 PM
i am trying to figure out what 3Mbps is equal to in KB/s in both ideal and reality (overhead).

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#2
Quote from greenmeansgoooo View Post :
i am trying to figure out what 3Mbps is equal to in KB/s in both ideal and reality (overhead).
Overhead is variable to each situation, so there's really no good way to add that into the equation without more info.

Case matters too, so 3Mbps is 3 megabits per second, whereas 3MBps is 3 megabytes per second. Same goes for Kb and KB. 8 bits in a byte, so divide by 8 to convert from bits to bytes and multiply by 8 to convert from bytes to bits.

So, to answer your question:

3Mbps = 3,072Kbps = 384KB/s.
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#3
okay then of that 384KB/s about what amount averages as overhead.
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#4
There is real no such thing as average. it all varies on who and what are doing others things on the computer or the network. What exactly are you trying to do, though?
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#5
I have a server with a 100Mbps connection and sometimes when I download I get 13MB (thats megabytes) a second.
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#6
Quote from nytrokiss View Post :
I have a server with a 100Mbps connection and sometimes when I download I get 13MB (thats megabytes) a second.
No way. A 100Mb connection can only pump 12.5 megabytes per second max (and that's of course assuming that your internet speed is 100Mb/s). Because of things like frame overhead and TCP retransmissions, network ports never actually reach 12.5MB/s anyway, so whatever is reporting 13MB/s is flat out wrong.
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#7
Quote from greenmeansgoooo View Post :
okay then of that 384KB/s about what amount averages as overhead.
What are you considering overhead?
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#8
Quote from nytrokiss View Post :
I have a server with a 100Mbps connection and sometimes when I download I get 13MB (thats megabytes) a second.
NO WAY!

Quote from riptide_slick View Post :
No way. A 100Mb connection can only pump 12.5 megabytes per second max (and that's of course assuming that your internet speed is 100Mb/s). Because of things like frame overhead and TCP retransmissions, network ports never actually reach 12.5MB/s anyway, so whatever is reporting 13MB/s is flat out wrong.
you tell her!

Quote from riptide_slick View Post :
What are you considering overhead?
retrans, line bleed
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#9
Quote from greenmeansgoooo View Post :
retrans, line bleed
Retransmissions depend on the quality of the connection and the congestion on the network or at the server/client. So really any kind of ballpark figure is going to be wildly incorrect for any specific connection/situation.

And by line bleed, do you mean chatty apps? On a "quiet" machine I'd think less than 1% would be acceptable "loss" to other application traffic (like update checking programs and the like.) Spyware would be a different story, of course.
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#10
on a 3mbit downstream connection (e.g. cable or dsl), typical 'good' download rate measured in kilobytes per second should be around 340-350 (that's 2x our very solid 1.5mbit dsl line on a multipart download off a local mirror).. anything 300-320+ should be considered acceptable. of course, exact speeds depend on actual provisioned speed (which can vary greatly for the "same" speed from provider to provider) and other factors.
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Last edited by 2cheap4retail October 29, 2010 at 12:50 AM
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#12
Is this AT&T dsl? If so, I believe the speed is not 3mbps. It is more like 3000k. If you run the speed tests, you will get something like 2500kbps. When you download something, you should get around 300kBps.
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#13
Quote from greenmeansgoooo View Post :
i am trying to figure out what 3Mbps is equal to in KB/s in both ideal and reality (overhead).
For future reference, you can use Google's Calculator feature. Just type "3 Mbps to KBps" into Google and it will give you the direct conversion. I know this doesn't help your "reality" requirement, but it's a good place to start.

http://www.google.com/intl/en/hel...calculator
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#14
Quote from greenmeansgoooo View Post :
i am trying to figure out what 3Mbps is equal to in KB/s in both ideal and reality (overhead).
My 3.2Mbs PPPoA DSL line gets about 2.6Mbs max download speed.

As others have stated, it depends on what protocols you are encapulating your data packets in.
IP/TCP packet itself has overhead and then whatever backbone you are connected to will also have overhead. If you have encrypted packets, that has overhead.

http://www.networkstuff.eu/index...._Using_AES has some interesting stuff.

Good luck on your journey.
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#15
For DSL, it all depends on how near you are to the box.

For me, my ATT DSL speed is 6 mb, but I am actually getting 6.4 mb bc my house is near the box.

If you are in the SE (Bellsouth region), your upload speed is like 456kbps and I am only getting 420 kbps. ATT can increase it, but they dont want. This is the only thing I dont like.
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