[SI-LIST] 10GBase-T testing: Analysis of the IEEE Std 802.3™-2002 Cable Clamp

From: Doug Smith <doug@xxxxxxxxxx>
To: emc-pstc <emc-pstc@xxxxxxxx>, Si-List <si-list@xxxxxxxxxxxxx>
Date: Mon, 07 Dec 2009 20:38:16 -0800

Hi Everyone,

This month I have a set of measurements I think many of you may be 
interested in.

Technical Tidbit - December 2009
Analysis of the IEEE Std 802.3™-2002 Cable Clamp
(It May Not Be a Good Idea to Use it for 10 Gigabit Ethernet Testing!)

This month's Technical Tidbit details problems that result when using 
the IEEE Std 802.3™-2002 Cable Clamp, designed for testing 1000Base-T 
Ethernet ports, for testing 10GBase-T Ethernet ports. The clamp has 
serious problems above 300 MHz and should not be used for testing 
10GBase-T Ethernet ports.

Abstract: An injection clamp is defined in IEEE Std 802.3™-2002 Annex 
40B for testing conducted immunity on 1000Base-T Ethernet ports. There 
has been a move to use that clamp for conducted immunity testing of 
10GBase-T Ethernet ports as well. However, the clamp has significant 
problems when used at frequencies above 300 MHz and should not be used 
for these higher frequencies. A few other problems that can result from 
using this clamp for 10GBase-T port immunity testing are also discussed.

Go to http://emcesd.com and page down to the analyzer plot at the bottom 
of the page. The picture is the link to the article.

Doug

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[SI-LIST] 10GBase-T testing: Analysis of the IEEE Std 802.3™-2002 Cable Clamp

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