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The video tutorial reviews the basics of the SENT Protocol, which stands for Single Edge Nibble Transmission. It is an automotive networking protocol designed for reporting low-speed sensor data to the engine control unit (ECU) due to the noisy environment in vehicles, making high-resolution data transmission impractical. In SENT, sensor signals are conveyed through a series of pulse widths, measured from falling-edge to falling-edge. The physical layer consists of a 5 V signal line connected to ground, with logic-low represented by less than 0.5 V and logic-high by more than 4.1 V. Each SENT frame starts with a Synchronization (SYNC) pulse to establish Tick Time (TT), calculated by dividing the sync pulse length by 56, followed by the data payload.