Flight Lab / Telemetry & the test bench / 07
Lesson 07 of 09 · about 4 min
Two checks tell you whether a downlink is whole. The sequence count should climb by one. The CRC on the packet should match the CRC you compute over the bytes ahead of it. A jump is a lost packet. A mismatch with a steady count is corruption.
Each row shows the sequence count you received and both CRC values, calculated with the same CCITT-FALSE rule as the builder. Mark the one gap and the one bad CRC. Leave the healthy rows as OK.