RE: [SI-LIST] : Definition of Hi-Speed (UC)

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From: Christopher Knapton (cknapton@nortelnetworks.com)
Date: Tue Nov 02 1999 - 13:17:50 PST


For what it's worth, to me, high speed is determined by the need to generate
an acceptable signal and is relative. SI is the acronym for 'Signal
Integrity" with no reference to a specific bit rate, frequency, or edge
rate. A WEB search on "high speed" will yield devices operating from Kilo
bits/sec (the latest modem) to Giga bits/sec (the latest drivers) and all
are correct for that application. A 128 Kilo bit/sec modem is high speed
compared to 14 Kilo bit/sec., and virtually DC compared to 100 Mega
bits/sec. You have to know the limitation or characteristics of the medium
though which the signal is to pass. You then have to provide a device
capable of driving into that medium. Lastly you have to provide a device
capable of receiving this. All with system design requirements, which are
primarily to carry error free data cost effectively and with acceptable
margins. I've personally found the lower bit rates the most challenging due
to the quantity and poor medium I'm expected to transmit through. Higher
bit rates that the "list" tends to address are expected to be costly and
require very specific design rules.

Chris

                -----Original Message-----
                From: sweir [mailto:weirsp@a.crl.com]
                Sent: Monday, November 01, 1999 5:09 PM
                To: si-list@silab.eng.sun.com
                Subject: Re: [SI-LIST] : Definition of Hi-Speed (UC)

                Please refer your boss to the first paragraph of Jack
London's "To Build a
                Fire". This comprehensive tale of SI, and EMC takes place
in the Alaskan
                wilderness. The key quote is "... but to him it was just a
number." He dies.

                If his attention span is longer, purchase "High Speed
Digital Design" by
                Dr. Johnson.

                Regards,

                Steve.
                At 12:54 PM 11/1/99 +0800, you wrote:
>Pardon me for asking this stupid question because I am at a
loss of how
>to explain hi-speed to my boss. He thinks that hi-speed is
as simple and
>straightforward as resistance = V/I and nothing else.
Hi-speed should be
>some circuits that need to operate at xxMHz or more.
Anything less than
>xxMhz is not hi-speed.
>
>I would appreciate anyone of you experts out there who can
enlighten me
>in a simple and easy to understand definition so that my
boss can
>understand.
>
>Regards.
>
>
>
>
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