RE: [SI-LIST] : Far end crosstalk

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From: Peterson, James F (FL51) (james.f.peterson@honeywell.com)
Date: Fri Oct 13 2000 - 07:59:56 PDT


Hello Ohio,
 
I guess my question would be, why does it have to be a ratio of anything?
Why can't it just be the amount of noise visible at the far end of the
victim's transmission line?
 
I guess if it is a rating of a t-line's capacity for crosstalk then you
might go with a ratio (for x amount of voltage injected at the aggressor's
t-line you will get x mV of coupled noise at the victim's far end). If this
is the case I would think you would use the aggressor's initial signal
level.
 
Jim

-----Original Message-----
From: JOHN SAWDY [mailto:JSAWDY@meritec.com]
Sent: Wednesday, October 11, 2000 12:48 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Far end crosstalk

Greetings from Ohio.
What is the correct definition for far end crosstalk for a transmission line
(cable): is it the ratio of the voltage measured at the far end of a quiet
line vs. the input voltage on the active line or vs. the output (far end)
voltage on the active line, which is an attenuated version of the input
voltage.

FEXT = Vout quiet/Vin active or Vout quiet/Vout active?

John F. Sawdy, Senior Applications Engineer
Meritec, a division of Associated Enterprises
voice mail: 440-354-3148 x 267
fax: 440 -354-0687
mailto:jsawdy@meritec.com <mailto:jsawdy@meritec.com>

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