[28666] in North American Network Operators' Group
Re: Optical Crossconnects and IP
daemon@ATHENA.MIT.EDU (Jerry Scharf)
Thu May 11 15:46:11 2000
Message-Id: <200005111943.MAA14515@sh.lh.vix.com>
To: Tony Li <tli@procket.com>
Cc: nanog@nanog.org
In-reply-to: Your message of "Thu, 11 May 2000 10:54:30 PDT."
<200005111754.KAA13905@miata.procket.com>
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Date: Thu, 11 May 2000 12:43:47 -0700
From: Jerry Scharf <scharf@vix.com>
Errors-To: owner-nanog-outgoing@merit.edu
Tony,
All the control systems I know of that allow rapid change of rate use mass (a
known fixed quatity) as a major damping component. Same goes for knowing the
amount of reactant at any time in chemical processes. I see no comparable
function on packet switched networks, thus the hardness in creating fast
stable control systems.
Tell me what the knowns are for an ISP network and compare it to the knowns of
an airplane (mass, moment, thrust, control surfaces, characteristics of air,
...) No wonder you can make a F18 turn faster than an ISP routing table. On
the other hand, being wrong on an ISP routing table has lower cost than an out
of control F18.
How many of us are old enough to have taken an analog circuits class in
college? They say build a circuit that has the following resonse, and it
sounds so easy in class. Three or four hours of lab work later, the fact that
even simple stuff is hard gets drilled in deeply.
jerry
