[PCB_FORUM] Re: backplane

Paul,

I designed a similar Back plane a few year back, and I ended up with 18
layers

Back plane was about .240" thick

About 2400 diff pairs

 

The trick is to have total control of the PIN -Out arrangement on the
entire chassis. 

Meaning you dictate the PIN-out to the Engineers for each blade type
Fabric and IO

It will take you a couple of days to have a good plan and strategy in
order to have a good pin-out

-Patrick

 

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Paul A.
Simonelli
Sent: Tuesday, April 25, 2006 1:03 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] backplane

 

 I have a backplane with 20 slots. There are 2 fabric slots and 18 other
slots. We want a full mesh topology. Each slot has to have a connection
to every other slot. The connecter I'm using has 4 pairs in each row.
All 4 pairs of one row on a slot go to 4 pairs on another slot. I've
been asked to try and figure the least amount of layers this requires.
No matter what I try, the layer count is extremely high. Does anyone
know of anyplace on the web that might show some routing strategies for
this? Have any of you ever done anything like this? Any help would be
greatly appreciated. Thanks.

 

 

 

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