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<p>The term patch came from early use in <a href="page.php?w=telephony">telephony</a> and <a href="page.php?w=radio_studio">radio studio</a>s, where extra equipment kept on standby could be temporarily substituted for failed devices. This reconnection was done via <a href="page.php?w=patch_cord">patch cord</a>s and patch panels, like the jack fields of cord-type <a href="page.php?w=telephone_switchboard">telephone switchboard</a>s.</p>

<p><big>Terminology</big></p>
<p>Patch panels are also referred to as <b>patch bays</b>, <b>patch fields</b>, <b>jack</b></p><p>
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