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[802.3BA] Why 40GE and not 50GE?

To: STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
Subject: [802.3BA] Why 40GE and not 50GE?
From: "Frankel, Michael" <MFrankel@xxxxxxxxx>
Date: Mon, 18 Feb 2008 10:10:58 -0500
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Reply-To: "Frankel, Michael" <MFrankel@xxxxxxxxx>
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Thread-Topic: Why 40GE and not 50GE?

Title: Why 40GE and not 50GE?

I appologize ahead of time if this question has been addressed. I looked over past HSSG material, and cannot find any info on how specific 40GE rate came about (as opposed to 50 GE). 40G simply appears as a "fact" in all the presentations.

Is 40G a default selection because of its ties to OC768 and OTU3?

The only item I found is Slide 5 of following presentation mentions PCIe x16 Gen2 as 50 Gbps of bandwidth.
http://www.ieee802.org/3/hssg/public/may07/pepeljugoski_01_0507.pdf

Michael.

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