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<p>of interconnect protocols are widely used. </p>

<p><big> Role </big></p>
<p>The physical layer defines the means of transmitting a stream of raw <a href="page.php?w=bit">bit</a>s over a physical <a href="page.php?w=data_link">data link</a> connecting <a href="page.php?w=network_node">network node</a>s. The <a href="page.php?w=bitstream">bitstream</a> may be grouped into code words or symbols and converted to a physical <a href="page.php?w=signal">signal</a> that is transmitted over a <a href="page.php?w=transmission_medium">transmission medium</a>. </p>

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