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Posted by wslim22 on November 22, 2005, 10:39 am
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Why is the speed limit of Fast Ethernet limited to 100mbps? Is it
becasue of the packet length?
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Posted by Walter Roberson on November 22, 2005, 11:35 am
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:Why is the speed limit of Fast Ethernet limited to 100mbps? Is it
:becasue of the packet length?
No, the rate is defined by the carrier frequency and choice of
encoding schemes onto the carrier. It is not just a plain
"1 bit per hertz" though; there are concerns about EMI and
frequency attenuation and negotiation. See, e.g.,
http://www.industrialethernetu.com/courses/103_3.htm
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest
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Posted by DigitalSignal on November 23, 2005, 4:37 pm
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100 is an odd number. I really prefer 120. But these guys just don't
listen!
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Posted by Walter Roberson on November 23, 2005, 6:00 pm
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:100 is an odd number.
Yes, in any number system whose base is an odd positive integer (3 upwards)
:I really prefer 120. But these guys just don't listen!
Interestingly, 120 is an odd number in exactly the above set of
number systems that 100 is odd for.
More generally, 1p0 base q is odd if and only if
q is odd (3 upwards) and p is even.
For example, 130 is not odd in any positive integer base (4 upwards).
[Sorry, when you are programming in a symbolic computation language
for days on end, you start thinking about general solutions to statements
that contain assumptions such as "odd"...]
--
Is there any thing whereof it may be said, See, this is new? It hath
been already of old time, which was before us. -- Ecclesiastes
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Posted by James Knott on November 24, 2005, 6:52 am
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DigitalSignal wrote:
> 100 is an odd number. I really prefer 120. But these guys just don't
> listen!
I thought the answer was 42. ;-)
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