FreeLists / si-list / [SI-LIST] Re: How to Route XFP 10G electrical trace?

[Jeff Seeger <jseeger@xxxxxxxxxxxxxx>]

Msg: #4 in digest
Subject: [SI-LIST] How to Route XFP 10G electrical trace?
Date: Thu, 8 Mar 2007 11:14:50 -0600
From: "CHUNG Yee" <Yee.Chung@xxxxxxxxxxxxxxxxxx>

> snip <
> Based on internal discussion, we have some concern on the
> rear EMI gasket of the XFP cage that might scratch-off the solder-mask
> over time due to vibration hence short these traces to Gnd! However, I
> have check various vendors test board and even the Intel reference test
> board in the XFP MSA are using this method!
> snip <

        Soldermask should not be relied upon as a mechanical
        insulator, as your instincts incline.  This does not
        stop the practice though, until a product gets fully
        scrutinized with respect to a comprehensive spec.

        If the gasket can't be relieved in this exact area, I
        would suggest a bit of Kapton tape where you cross it.

-- 
 
      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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