EVERYTHING FOR ELECTRONICS
In your Reader Feedback, the
short comment by T. Tofte called
“Patent Problem” telling the history of
the FET, a book called Designing With
Field-Effect Transistors by Siliconix,
Inc., revised by Ed Oxner, page 2
shows a partial reproduction of a
patent Jan. 28, 1930 (1,745,175) by
Julius Edgar Lilienfeld of Brooklyn, NY
on an early Field Effect Transistor.
Ronald Robbins, El Cajon, CA
frame, we use 208 bits for field information and 96 bits ( 96 bit times) for the
interframe gap, giving 304 bits. Let us
call this the overhead. If we transmit
nothing but 72-byte minimal-length
Ethernet frames for an entire second,
we will be able to clock out 14,880
complete frames using 10 Mbps Ethernet (100 nanoseconds per bit). Now
imagine how many bits are involved
when we multiply 14,880 frames by the
overhead of 304 bits per frame. Specifically, we are talking about 4,523,520
bits. That is 45% of our 10,000,000 bit
bandwidth. That leaves almost 5,500,000
bits for carrying data each second.
WRITER NOT RIGHT
Imagine my horror at discovering
a series of math errors (all based on
the original error) in my recent Let’s
Get Technical column. Here are the
corrections. So sorry ... I am usually
quite picky about checking my work.
James Antonakos, Writer
Switching to units of bits, we have
26* 8 = 208 bits of field information
in each frame. The way Ethernet is
designed, there is always an idle time
period after each transmitted frame.
This is called the interframe gap, and
it corresponds to 96 bits worth of time.
So, when transmitting an Ethernet
NO END IN SIGHT?
It didn't register in November, but
in reading the December issue and
realizing that I was flipping pages backwards after each article — asking, is
this really the end? — it struck home.
That bright NV at the end of each
article was really very helpful. Come on
guys, if it ain't broke, don't fix it !!!
Dick Greet, Rye, CO
ON THE BRIGHTER SIDE ...
Never mind those soreheads ...
In The Trenches has been one of my
favorite columns, along with the tech
answers and "Tech-newlogy." And as for
the layout, while it may actually have
slightly less print
space, it's more
I'm sure was the
complaint I have
is the pages
makes photocopying harder —
in the January '06
issue, I saved so
much stuff, I just
pulled the pages
and rendered it
for passing on.
by J. Shuman
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