Dell Latitude 5491 Service Manual

Also see for Inspiron 5491: Service manual Setup and specifications guide Setup and specifications Setup and specifications guide Installation guide

Contents

Dell Latitude 5491 Service Manual Manual pdf 13 page image

USB Power DeliveryThe USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile devices often usea USB connection to charge. A USB 2.0 connection provides up to 2.5 watts of power — that'll charge your phone, but that's about it. Alaptop might require up to 60 watts, for example. The USB Power Delivery specification ups this power delivery to 100 watts. It's bi-directional, so a device can either send or receive power. And this power can be transferred at the same time the device is transmittingdata across the connection.This could spell the end of all those proprietary laptop charging cables, with everything charging via a standard USB connection. You couldcharge your laptop from one of those portable battery packs you charge your smartphones and other portable devices from today. Youcould plug your laptop into an external display connected to a power cable, and that external display would charge your laptop as you usedit as an external display — all via the one little USB Type-C connection. To use this, the device and the cable have to support USB PowerDelivery. Just having a USB Type-C connection doesn't necessarily mean they do.USB Type-C and USB 3.1USB 3.1 is a new USB standard. USB 3's theoretical bandwidth is 5 Gbps, while USB 3.1 Gen2 is10Gbps . That's double the bandwidth, asfast as a first-generation Thunderbolt connector. USB Type-C isn't the same thing as USB 3.1. USB Type-C is just a connector shape, andthe underlying technology could just be USB 2 or USB 3.0. In fact, Nokia's N1 Android tablet uses a USB Type-C connector, but underneathit's all USB 2.0 — not even USB 3.0. However, these technologies are closely related.Technology and components 13