Byran,

Yes, there are issues.  Yes there are boards like that.  We have a 
couple telecom type backplanes, one (a bad one) has 22 layers, 15"x22", 
press fit, SMT, etc. 
Are you building the assembly or are you sourcing them?  The answers to 
your questions, and the "gotchas" you face change depending on your 
answer.  Some issues could be: Hole Aspect Ratios, PWB surface finish, 
assembly tooling designs, order of assembly, Price, Price, Price, parts 
availability (it's in the catalog, but delivery is 24 weeks), not 
designing a single source situation, and (a personal favorite) "you 
should have thought about testing the assembly before now."

Gotchas abound!

George Franck


On Nov 5,  6:39am, Bryan K. Douglas wrote:
> Subject: ASSY: Large Boards for Telecom
> With quick survey of large (10" x 20") printed board assembly (PBA), 
we
> found that major issues include equipment capabilities, scrap and 
rework
> costs, design complexity, and warp.  
> 
> Assuming SMT, DSR, and press in connectors would be used on this type 
of 
> assembly, are there other major gotcha's related to large PBA?  Are 
there
> examples of boards this size in telecommunications transmission or 
> switching equipment?  
> 
> Bryan

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