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m added link to NRZ concept, that is fundamental to understand the encoding concepts.
m match target hyphens
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! Signal !! Comments !! 1 state !! 0 state
|-
| NRZ–L || [[Non -return -to -zero]] level. This is the standard positive logic signal format used in digital circuits.
| forces a high level
| forces a low level
|-
| NRZ–M || Non -return -to -zero mark
| forces a transition
| does nothing (keeps sending the previous level)
|-
| NRZ–S || Non -return -to -zero space
| does nothing (keeps sending the previous level)
| forces a transition