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Sample finding
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PRE-BUILD AUDIT · 224G SERIAL INTERCONNECT
Two designs pass.
One will fail.
TWO CANDIDATES
NOMINAL SIMULATION
MARGIN ACROSS BUILD + STRESS CONDITIONS
Candidate A
package
board
via
connector
cable
PASS
Candidate B
package
board
via
connector
cable
P/N skew
PASS
3 dB limit
nominal
nominal
→ build A
→ measure B's skew first
fails
0
2
4
6
8 dB
Channel Operating Margin (COM)