Explain signal integrity and how to maintain it in a noisy environment.

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Signal integrity is about preserving the quality of the electrical signal from its source to the load so edges stay sharp, levels stay within tolerance, and timing remains reliable even when there’s electrical noise. In a noisy environment that interference from EMI, crosstalk, and reflections can distort the waveform, causing data errors or timing jitter. To keep the signal clean, use shielding to block external interference, twisted-pair or balanced lines so noise appears equally on both conductors and cancels out, and a solid grounding scheme that provides a low-impedance return path and minimizes loop area. Keeping runs short reduces attenuation, delay, and opportunities for noise to couple in, and employing proper termination at the ends of the line matches the source and load impedance to prevent reflections that would blur edges and distort timing. Long runs with no termination invite more distortion, while neglecting grounding removes a key mechanism for noise control.