RE: [SI-LIST] : Far end crosstalk

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From: Larry Miller ([email protected])
Date: Fri Oct 13 2000 - 13:44:56 PDT

Coupled signal at far end divided by aggressor's signal level is the way
Ethernet defines it. Naturally, this is a number (usually in dB) that varies
with frequency.

Larry Miller

> -----Original Message-----
> From: Peterson, James F (FL51) [SMTP:[email protected]]
> Sent: Friday, October 13, 2000 8:00 AM
> To: [email protected]
> Subject: RE: [SI-LIST] : Far end crosstalk
> 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:[email protected]]
> Sent: Wednesday, October 11, 2000 12:48 PM
> To: [email protected]
> 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:[email protected]>

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