What is USB-C Power Delivery (PD) pass-through? - StarTech.com IT Pro Community
<main> <article class="userContent"> <p><em>This article was created from a </em><a href="https://community.startech.com/discussion/52/what-is-a-passthrough" rel="nofollow noreferrer ugc"><em>community discussion</em></a><em> by </em><a href="https://community.startech.com/profile/jtan" rel="nofollow noreferrer ugc"><em>jtan</em></a>.</p><p>Using Power Delivery pass-through with a supported USB-C laptop, you can power the laptop and the multiport adapter/hub with your existing USB-C laptop power adapter. To ensure the hub powers and charges your laptop, your host laptop's USB-C port must support USB Power Delivery. An existing USB-C laptop power adapter is plugged into the hub, which then "passes through" power to charge the laptop over the single USB-C connection.</p><h2 data-id="reserved-power">Reserved Power</h2><p>With most multiport adapters/hubs, some amount of power (commonly between 4W and 15W, depending on I/O) is reserved for hub/downstream ports. This means if a hub like our <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fhb30c4afpd" rel="nofollow noreferrer ugc">HB30C4AFPD</a> (that reserves 7.4W) is used with a 60W USB-C power adapter, only 52.6W will be provided to the laptop via PD Passthrough.</p><h2 data-id="host-usb-c-ports-without-usb-pd-support">Host USB-C Ports Without USB PD Support</h2><p>Not all USB-C ports support the full functionality of the USB Type-C standard. Multiport adapters/hubs can connect to a host laptop’s USB-C port that doesn’t support USB Power Delivery. However, in this configuration, if a power adapter is connected to the multiport adapter/hub, it will not pass power through to the host laptop.</p><p><br></p><div class="blockquote"><div class="blockquote-content"><p class="blockquote-line">This FAQ applies to these products: <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2dviucp" rel="nofollow noreferrer ugc">CDP2DVIUCP</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2dviucpw" rel="nofollow noreferrer ugc">CDP2DVIUCPW</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fcdp2hduacp" rel="nofollow noreferrer ugc">CDP2HDUACP</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fcdp2hduacpw" rel="nofollow noreferrer ugc">CDP2HDUACPW</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2hducp" rel="nofollow noreferrer ugc">CDP2HDUCP</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2hducpw" rel="nofollow noreferrer ugc">CDP2HDUCPW</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fcdp2vgauacp" rel="nofollow noreferrer ugc">CDP2VGAUACP</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2vgaucp" rel="nofollow noreferrer ugc">CDP2VGAUCP</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Faudio-video-products%2Fcdp2vgaucpw" rel="nofollow noreferrer ugc">CDP2VGAUCPW</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fhb30c3agepd" rel="nofollow noreferrer ugc">HB30C3AGEPD</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fhb30c4afpd" rel="nofollow noreferrer ugc">HB30C4AFPD</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fnetworking-io%2Fus1gc301au" rel="nofollow noreferrer ugc">US1GC301AU</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fnetworking-io%2Fus1gc303apd" rel="nofollow noreferrer ugc">US1GC303APD</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fnetworking-io%2Fus1gc30pd" rel="nofollow noreferrer ugc">US1GC30PD</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fcdp2hvguaspd" rel="nofollow noreferrer ugc">CDP2HVGUASPD</a> 115B-USBC-MULTIPORT 120B-USBC-MULTIPORT 122-USBC-HDMI-4K-VGA 127B-USBC-MULTIPORT CDP2HVGUASPD CDP2HVGUASPD DKT31CH2CPD3 102B-USBC-MULTIPORT HB31CM4CPD3 DKT31CMDPHPD</p></div></div> </article> </main>