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On/Off (unipolar)<br />

Line Codes<br />

“1” send p(t), “0” nothing<br />

Return to zero (RZ)<br />

Non-Return to Zero (NRZ)<br />

Polar (bipolar)<br />

“1” send p(t), “0” send -p(t)<br />

1 1 1 0 0 1 1<br />

RZ<br />

t<br />

1 1 1 0 0 1 1<br />

1 1 1 0 0 1 1<br />

1 1 1 0 0 1 1<br />

NRZ<br />

t<br />

RZ<br />

NRZ<br />

t<br />

t

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