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10base100base speed

 
 
Mike Laughlin
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      6th Oct 2003
I have two computers networked together with a router using cat5 cables. How
fast is 100mbps?
100 x 60 secs is 6000. When I go from hardrive to hardrive in the same
computer I am luckey if I get 1000 megabyte or 1 gigabyte transfer per
minute. I am confused as to how fast under Ideal conditions two fast
computers might be able to transfer files to each other on a home network.
My download speed from the internet is about 2 megabit but I know I couldn't
download 2 x 60 or 120 megabyte in 1 minute. Is megabyte and megabit the
same thing?

Thanks for
any help on this, Mike Laughlin


 
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John Wunderlich
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      6th Oct 2003
"Mike Laughlin" <(E-Mail Removed)> wrote in
news:bL9gb.35958$(E-Mail Removed):

> Is megabyte and megabit the same thing?



No. 1 byte = 8 bits.
IP packets have overhead as well, so I estimate about 10 bits/payload
byte. So 100Mbit is about 10 MByte/sec. This can vary drastically
depending on whether there are a lot of small packets or fewer larger
ones.

HTH,
John
 
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John I.
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      6th Oct 2003
Two issues:
1. MBps vs. Mbps B = Byte, b = bit (8 bits per byte)
Modem and network speed is rated at Mbps but file size is shown in MB
so you need to divide the "speed" by 8

2. Overhead – the data you move is like the (box in a box in a box in
a box) layers of information is added by the sending computer only to
be stripped off by the receiving computer.

In short you get a lot less than you think you should.




"Mike Laughlin" <(E-Mail Removed)> wrote in message news:<bL9gb.35958$(E-Mail Removed)>...
> I have two computers networked together with a router using cat5 cables. How
> fast is 100mbps?
> 100 x 60 secs is 6000. When I go from hardrive to hardrive in the same
> computer I am luckey if I get 1000 megabyte or 1 gigabyte transfer per
> minute. I am confused as to how fast under Ideal conditions two fast
> computers might be able to transfer files to each other on a home network.
> My download speed from the internet is about 2 megabit but I know I couldn't
> download 2 x 60 or 120 megabyte in 1 minute. Is megabyte and megabit the
> same thing?
>
> Thanks for
> any help on this, Mike Laughlin

 
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Mike Laughlin
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Posts: n/a
 
      7th Oct 2003
Thanks very much for the info. I knew to someone out there this would be a
simple answer. Now I have a realistic Idea of what I need and to expect.
"John I." <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Two issues:
> 1. MBps vs. Mbps B = Byte, b = bit (8 bits per byte)
> Modem and network speed is rated at Mbps but file size is shown in MB
> so you need to divide the "speed" by 8
>
> 2. Overhead - the data you move is like the (box in a box in a box in
> a box) layers of information is added by the sending computer only to
> be stripped off by the receiving computer.
>
> In short you get a lot less than you think you should.
>
>
>
>
> "Mike Laughlin" <(E-Mail Removed)> wrote in message

news:<bL9gb.35958$(E-Mail Removed)>...
> > I have two computers networked together with a router using cat5 cables.

How
> > fast is 100mbps?
> > 100 x 60 secs is 6000. When I go from hardrive to hardrive in the same
> > computer I am luckey if I get 1000 megabyte or 1 gigabyte transfer per
> > minute. I am confused as to how fast under Ideal conditions two fast
> > computers might be able to transfer files to each other on a home

network.
> > My download speed from the internet is about 2 megabit but I know I

couldn't
> > download 2 x 60 or 120 megabyte in 1 minute. Is megabyte and megabit the
> > same thing?
> >
> > Thanks

for
> > any help on this, Mike Laughlin



 
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