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Trigger Crossbar
crossbar If you have a large, well-equipped electronics lab you’re going to have a lot of instrumentation with trigger input and output ports. In my case all three oscilloscopes, the vector signal generator, and even my VNAs have trigger sync capability, and there’s probably more things I’m missing.
All I had to do was gently push in the latching pin on each crimp terminal to remove it from the plastic housing, then reinsert them in the correct order and add a bright orange stick-on warning label “mirrored pinout” so I didn’t mix up this special cable with a standard-pinout one. After about an hour of very careful machining, periodically stopping to unmount the board and look at it from different angles under the nice microscope, I saw the back side of the target BGA land coming into view, still under around 50 μm of laminate but clearly visible after adding a drop of IPA (a little trick I’ve learned when doing rework: it soaks into the resin and fills the gaps between the glass strands, acting to match the refractive index better and making it more transparent with less scatter) The SSH interface is mostly used for low level configuration and setup - managing keys for administrative access, forcing refreshes of the front panel LCD, displaying hardware sensor values, setting the NTP server IP address, etc.
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