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<p>A <b>keystone module</b> is a standardized snap-in package for mounting a variety of low-voltage electrical <a href="Jack_(connector)" class="mw-redirect" title="Jack (connector)">jacks</a> or optical connectors into a <a href="Keystone_wall_plate" title="Keystone wall plate">keystone wall plate</a>, face plate, surface-mount box, or a <a href="Patch_panel" title="Patch panel">patch panel</a>.

</p><p>Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs. This allows them to be snapped into a mounting plate with correspondingly-sized rectangular holes, called ports. Most keystones are interchangeable and replaceable. This provides much flexibility in arranging and mounting many different types of electrical jacks in one plate or panel without requiring customized manufacturing.

</p><p>Some keystones use a pass-through type connector, where there is a jack on both the front face and the rear side. Others only have a jack on the front and employ a different mechanism for hard-wiring signal cables to the rear, such as a mini <a href="110_block" title="110 block">110 block</a>, an <a href="Insulation-displacement_connector" class="mw-redirect" title="Insulation-displacement connector">insulation-displacement connector</a>, or a <a href="Crimp_(joining)" title="Crimp (joining)">crimp</a> or <a href="Solder" title="Solder">solder</a> connection.

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<div class="mw-heading mw-heading2"><h2 id="Types">Types</h2></div>

<p>Many types of jacks are available in the keystone module format, limited mainly by their physical size, including:

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<ul><li><a href="6P6C" class="mw-redirect" title="6P6C">6P6C</a> (<a href="RJ-11" class="mw-redirect" title="RJ-11">RJ-11</a>) <a href="Modular_connector" title="Modular connector">modular jacks</a> (telephone)</li>

<li><a href="8P8C" class="mw-redirect" title="8P8C">8P8C</a> (<a href="RJ45_(telecommunications)" class="mw-redirect" title="RJ45 (telecommunications)">RJ-45</a>) modular jacks (computer networking), unshielded for UTP cable and shielded for STP.</li>

<li><a href="F_connector" title="F connector">F connector</a> (TV antenna/cable/satellite), 75 ohm coaxial</li>

<li><a href="RCA_jack" class="mw-redirect" title="RCA jack">RCA jacks</a> (audio/video)</li>

<li><a href="Mini-DIN_connector" title="Mini-DIN connector">4-pin mini-DIN</a> (<a href="S-Video" title="S-Video">S-Video</a> jacks)</li>

<li><a href="HDMI" title="HDMI">HDMI</a> jacks (high-definition video and audio)</li>

<li><a href="Optical_fiber_connector" title="Optical fiber connector">Optical fiber connectors</a></li>

<li><a href="BNC_connector" title="BNC connector">BNC connector</a> (50 ohm coaxial)</li>

<li><a href="USB" title="USB">USB</a> jacks</li>

<li><a href="Speaker_terminal" title="Speaker terminal">Speaker terminals</a></li>

<li><a href="Banana_connector" title="Banana connector">Banana connectors</a></li>

<li><a href="Binding_post" title="Binding post">Binding posts</a></li>

<li><a href="Phone_connector_(audio)" title="Phone connector (audio)">3.5 mm TRS connector</a> (miniature stereo headphone jack)</li>

<li><a href="British_telephone_socket" title="British telephone socket">British telephone socket</a> either as a master socket or a secondary socket</li></ul>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>The origin of the "Keystone" module may be traced back to US Patent 4261633 of Aug 27, 1979 for a "Wiring module for telephone jack" - by Amp Incorporated.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

The module referred to in that patent was affixed by "A <b>pair</b> of diagonally inclined mounting flanges (which) include stepped, panel bearing surfaces .. at the outer free ends thereof." The unit was "inserted through the panel opening, with the sides of the opening resiliently deflecting the (mounting flanges), until they pass through the opening and spring outwardly away from the remainder of the housing, with the panel bearing surfaces .. thereof seated against the front surface of the panel".

</p><p>However, the current design (now called "Keystone") is first referenced in US Patent US 5624274 of Nov 7, 1995 for a "Telephone connector with contact protection block" - by International Connectors And Cable Corporation.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> In this design the module is affixed by a <b>single</b> diagonally inclined mounting flange, together with a protuberance (ramp) on the opposite side. In the patent description, it is stated that "the jack assembly may be mounted to a face plate by first inserting the bottom of the jack assembly into a jack opening until the ramp of the housing engages a mounting surface of the face plate. The jack assembly is then rotated and snapped into place due to deflection of the cantilever latch of the housing."

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US4261633">"Wiring module for telephone jack"</a>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US5624274">"Telephone connector with contact protection block"</a>.</cite></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<p><span class="noviewer" typeof="mw:File"></span> Media related to <a href="https://commons.wikimedia.org/wiki/Category:Keystone_modules" class="extiw external" title="commons:Category:Keystone modules">Keystone modules</a> at Wikimedia Commons

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This article is issued from <a class="external text" title="Last edited on 2024-06-08" href="https://en.wikipedia.org/wiki/?title=Keystone_module&oldid=1227945218">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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