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Problems and usage of NRZ encoding/signaling scheme

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What are the major problems of NRZ (Non-Return to Zero) encoding/signaling? Is there any case where it's use could be acceptable? Discuss.

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When sending a long string of 0s or 1s, it builds up a constant signal level on the line for the duration, either high or low respectively, which affects the synchronization between two ends, resulting in imprecise/inaccurate measurement of sent information (i.e. determining how many 0s or 1s were sent in a ...

Solution Summary

The solution briefly talks about the cases when synchronisation between two ends is affected, leading to imprecise measurement of data.