RE: [SI-LIST] : Far end crosstalk

About this list Date view Thread view Subject view Author view

From: Larry Miller (ldmiller@nortelnetworks.com)
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:james.f.peterson@honeywell.com]
> Sent: Friday, October 13, 2000 8:00 AM
> To: si-list@silab.eng.sun.com
> 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: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>
>

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:29:46 PDT