Hello Diaco,

As you can see from all the responses to your question, you have 
received many contradictory answers! As the Israeli member of the 
IEC 950 WG7 Committe, I would like to provide you with the 
correct answer. However, I would first need you to provide me with 
details of what a DAA modem is. 

Best Regards,



Date sent:              Thu, 08 Oct 1998 12:29:28 -0700
To:                     emc-p...@majordomo.ieee.org
From:                   Diaco Davari <dav...@pmc.philips.com>
Subject:                Crepage/Clearance On Telecom Modem design
Send reply to:          Diaco Davari <dav...@pmc.philips.com>

> Hello Folks,
> 
> Does anyone know what the crepage distance shall be across the isolation
> from the line side to modem side within the DAA of Modems? 
> 
> Which document/standard refers to this specific spacing in detail ?
> 
> I have been told by local experts on EN60950 that I need 4.2 mm spacing
> across the isolation. Apparently I do not need to have the spacing on the
> top of the board in alignment (or registration) with the spacing on the
> bottom of the board. 
> 
> Regards,
> 
> Diaco
> 
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