High speed data communication is either Cat-5 TP or fiber.
You can dismiss the need to test fiber by engineering argument
Cat-5 TP should be tested using a clamp.
David Sterner
______________________________ Reply Separator
_________________________________
Subject: Re(4): EN 61000-4-6 CDNs for a high speed bus.
Author: "brian_kunde" <SMTP:[email protected]> at ADEMCONET
List-Post: [email protected]
Date: 8/2/2000 4:05 PM
Don,
I would assume that a "High Speed Bus" over 3 meters in length would most
likely
be a shielded cable. In this case you can't use the clamp. You'll have to
use
the direct couple method into the shield of the cable through a 100 ohm
resistor. This method is also described in EN61000-4-6.
Brian
____________________Reply Separator____________________
Subject: Re: EN 61000-4-6 CDNs for a high speed bus.
Author: Chris Collin <[email protected]>
List-Post: [email protected]
Date: 8/1/00 4:12 PM
Don,
If no CDN networks are suitable - and indeed they are not for high
communication
lines -, you should consider the possibility to use the EM-clamp as
described in
EN61000-4-6. That's the way we perform tests without degradation of the EUT
signals.
Regards,
Chris
On Tue, 01 August 2000, [email protected] wrote:
>
>
> Hello Friends,
>
> We are getting into faster interconnects that can be affected by the CDNs
> called out by EN 61000-4-6.
>
> Has anyone tested a system consisting of an EUT connected to various
> peripherals by USB, Firewire, 10 Base T or other bus configurations
> considered "high speed" today? It seems decoupling by an inductor > 280
uH
> @ 150 kHz as indicated in the various CDNs in Annex D should cause
> considerable signal integrity issues even before the test signal is
applied.
>
> If you have tested high speed interconnects to EN 61000-4-6, how did you
> manage the signal integrity issues? Special CDNs? Special test setup?
> This seems like a topic everyone would be interested in.
>
> Just call me curious,
>
> Don
>
> (not George)
>
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