From Oscilloscope to Wireshark: A UDP Story

The article traces the full journey of decoding UDP packets starting from raw voltage waveforms captured by an oscilloscope on an Oxide Computer Company rack switch, going through all OSI layers from L1 to L4. The author used a high-speed differential probe and a Tektronix oscilloscope to capture 100 µs of analog data at 1 TSPS, then wrote a parser to process the waveform file. This work was part of debugging a link reliability issue caused by a misconfiguration of the VSC7448 switch IC.