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<a accesskey="1" href="page.php?w=line_code&amp;p=21">1.Previous</a><br />
<a accesskey="3" href="page.php?w=line_code&amp;p=23">3.Next</a>
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<p>(PPM)<br/>
* <a href="page.php?w=Return-to-zero">Return-to-zero</a> (RZ)<br/>
* <a href="page.php?w=TC-PAM">TC-PAM</a></p>

<p><big>Optical line codes</big></p>
<p>
* <a href="page.php?w=Alternate-Phase_Return-to-Zero">Alternate-Phase Return-to-Zero</a> (APRZ)<br/>
* <a href="page.php?w=Carrier-Suppressed_Return-to-Zero">Carrier-Suppressed Return-to-Zero</a> (CSRZ)<br/>
* <a href="page.php?w=IEEE_1355">Three of Six, Fiber Optical</a> (TS-FO)</p>

<p><big> See also </big></p>
<p>
* <a href="page.php?w=Physical_layer">Physical layer</a><br/>
* <a href="page.php?w=Self-synchronizing_code">Self-synchronizing code</a></p><p>
<a accesskey="1" href="page.php?w=line_code&amp;p=21">1.Previous</a><br />
<a accesskey="3" href="page.php?w=line_code&amp;p=23">3.Next</a>
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