[SI-LIST] Re: Jitter transfer vs. accumulation

True, but I would argue that the probability of a 1000-year TIE (or even =
several UIs of TIE) is so small (if indeed possible) that it isn't worth =
taking into consideration.=20

If you restrict yourself to extending the Gaussian distribution to the =
bit error rate you're trying to achieve, it is probably as good a =
mathematical model as you can get.   =20

Art

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Scott McMorrow
Sent: Monday, March 26, 2007 2:23 PM
To: art_porter@xxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Jitter transfer vs. accumulation

Art

While I would agree that most terrestrial data communications links are=20
dominated by a large number of non-random processes that appear random=20
when taken as a whole, I would take issue with your .0005 or 700-ft tall =

human analogy.  There are structural limitations for humans.  For=20
electronics, the charge of an electron sets a practical lower floor for=20
all events, but there is not an upper limit.  You wouldn't argue against =

the near-Gaussian distribution of Johnson-Nyquist noise or the Poisson=20
distribution of and Shot noise, or their impact on receiver and control=20
loop design, would you?  And if you want to see 100V noise spike=20
outliers, just wait long enough and you'll eventually receive a nuclear=20
particle event.  It may not be truly random, since it was originally=20
based on a deterministic cataclysmic nuclear process in a star, but it=20
is for all practical purposes random.

Scott

Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed(r) is the registered service mark of
Teraspeed Consulting Group LLC




>  =20
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