FreeLists / si-list / [SI-LIST] Re: Stackup Suggestion for E1 transportor card

[steve weir <weirsi@xxxxxxxxxx>]

Suresh, what do you think is good and bad about  this stack-up?  I think 
there are better ways to stack-up a 12 layer board with your apparent 
requirements.  But, you can still make this one work.  If you are trying to 
maintain impedance control at low MHz frequencies, be mindful of your 
copper weight.

Steve.
At 04:44 AM 9/10/2005 -0700, Suresh kumar wrote:
>Hi all,
>
>I would like to  have your valuable suggestion regarding this Stackup.
>This is basically a E1 transportor Card ( Telecom Application)
>
>Top
>GND 
>-----------------------------------------------------------------------
>Layer -3  ( E1 2M clocks , 100Mhz clk, 133Mhz clk, 60Mhz clk)
>Layer- 4   (Others signals)
>PWR         Complete 
>plane   -----------------------------------------------------------
>Layer-6  (others signals)
>Layer-7  (E1 2M clocks , 100Mhz clk, 133Mhz clk, 60Mhz clk, 60Mhz Bus,GMII)
>Gnd 
>----------------------------------------------------------
>Layer 9  ( E1 2M clocks , 100Mhz clk, 133Mhz clk, 60Mhz clk,Gig)
>Layer 10
>PWR      (Split plane) 
>--------         ---------------           -------------
>Bottom
>
>Stackup is done withrespect to 50 Ohm( 5mils width) impedance for single 
>ended signal
>and 100 ohm for differential (5mil with 8 mil spacing)
>
>
>
>With Regards,
>Suresh kumar.R
>
>
>Thanks & Regards,
>Suresh kumar.R
>
>
>
>
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