pretty much a question of drill edge to copper and the accompanying 
concerns dielectric concerns (i.e. CAF, isolation distance).

IMAO, ann ring breakout in and off itself is a red herring and much 
ado about nothing except as relates to the above dielectric concerns.


At 12:35 PM 7/23/2015, Louis Hart wrote:
>Victor, let an expert correct me, but misregistration layer-to-layer 
>in some PWB designs could impact integrity of differential signals. 
>Such designs appear to be quite rare, perhaps for the reason I 
>propose.  Louis Hart
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
>Sent: Thursday, July 23, 2015 9:44 AM
>To: [log in to unmask]
>Subject: [TN] PWB Inner layer Misregistration
>
>Fellow TechNetters:
>
>    Is there a correlation between PWB inner layer misregistration 
> and reliability?   What is IPC guidelines numerical value with 
> regards to inner layer misregistration hole breakout of signal 
> capture pad (s)?   I always hear of +/- 3 mils for all processes in 
> the PWB process.
>
>Victor,
>
>
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