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Re: Maximum ftp speed

 
 
Juergen Kluth
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      03-18-2010, 08:20 PM
As far as i understand:

1000Baste-T Gbit/s

is not simply a 1 Gbit/s system,
it is a "Two Times 500 MBit/s" system

4 wire pairs are used, each working at a frequency of 125 MBaud
(exactly 62.5 MHz with transmission of 2 bits per Hz)
- making up for each of the 4 pairs to transmit 125 Mbit/s

-- either only 1-way;
from one to the other end
(accumulating to 500 Mbit/s)
-- simultaneously from both ends to the both others
(accumulating 2 times 500Mbit/s = 1 Gbit/s)

at FTP (your situation) where only one is downloading, you use only the
"half system" (one end to the other,
with vice versa unused -except for some communication)

so your ~480 Mbit/s is very near to the theoretical maximum of 500 Mbit/s

-have in mind, there are several "non payload" data
for ethernet, TCP/IP, ... / frame, packetm ... overhead.

->check it out !
have a ftp server on linux plus windows and start simultaneously ftp
downloads; add the two data rates

JK
 
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Juergen Kluth
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      03-19-2010, 06:15 PM
I am reading the whole internet.
If i find the ideal site, it tell you.
jk
 
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Juergen Kluth
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      03-23-2010, 10:21 PM
Hi,
better i draw my multiplying back, i fear
allthoug it makes me confused about the shannon theoreme
jk
 
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