Hi, syseng68k
Being "hardware oriented" it seems they had a lot of stray capacitance and inductance with no ground plane, therefore "non controlled impedance. Just basing in my RF intuition.
. At this time i characterized back panel daughter boards connectors using TDR reflectometers. Very interesting results.
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Like, ChristiaanJ put:
2:11:55
FLR/FR0906010210 27933406EFCS1 X2,EFCS2X,,,,,,FCPC2 (2CE2) /
WRG:ADIRU1 BUS ADR1-2 TO FCPC2,HARD
What kind of Failure is this?