Amazon Basics 3.0 USB-A Male to Micro USB Cable With Gold-Plated Connectors, 1.8 m, 6 Feet, Black

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Use class information in the interface descriptors. This base class is defined to use in device descriptors to indicate that class information should be determined from the Interface Descriptors in the device.

Devices that draw more than one unit are high-power devices (such as typical 2.5-inch hard disk drives). USB up to 2.0 allows a host or hub to provide up to 2.5W to each device, in five discrete steps of 100mA, and SuperSpeed devices (USB 3.0 and up) allows a host or a hub to provide up to 4.5W in six steps of 150mA. USB-C supports high-power devices with up to 7.5W, in six steps of 250mA. Full-Featured USB-C Fabrics can support up to 15W. The first Power Delivery specification defined six fixed power profiles for the power sources. PD-aware devices implement a flexible power management scheme by interfacing with the power source through a bidirectional data channel and requesting a certain level of electrical power, variable up to 5A and 20V depending on supported profile. The power configuration protocol can use BMC coding over the CC wire if one is present, or a 24MHz BFSK-coded transmission channel on the V BUS line. Grunin, Lori (4 March 2019). "USB4 Marries Thunderbolt 3 for Faster Speeds and Smarter Transfers". CNET. Archived from the original on 4 March 2019 . Retrieved 4 March 2019.

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Small devices can be powered directly from the USB interface, eliminating the need for additional power supply cables.

a b "USB Power Delivery". USB.org. Archived from the original on 27 May 2021 . Retrieved 27 May 2021. Devices that draw no more than one unit are said to be low-power devices. All devices must act as low-power devices when starting out as unconfigured. For USB devices up to USB2.0 a unit load is 100mA (or 500mW), while USB3.0 defines a unit load as 150mA (750mW). Full-Featured USB-C Fabrics can support low-power devices with a unit load of 250mA (or 1250mW). The USB-C connector supersedes all earlier USB connectors and the Mini DisplayPort connector. It is used for all USB protocols and for Thunderbolt (3 and later), DisplayPort (1.2 and later), and others. Developed at roughly the same time as the USB3.1 specification, but distinct from it, the USB-C Specification 1.0 was finalized in August 2014 [24] and defines a new small reversible-plug connector for USB devices. [25] The USB-C plug connects to both hosts and devices, replacing various Type-A and Type-B connectors and cables with a standard meant to be future-proof. [24] [26] The thinner Micro-USB connectors were intended to replace the Mini connectors in devices manufactured since May 2007, including smartphones, personal digital assistants, and cameras. [15] FireWire vs. USB2.0". USB Ware. Archived from the original on 16 March 2007 . Retrieved 19 March 2007.

The Universal Serial Bus was developed to simplify and improve the interface between personal computers and peripheral devices, such as cell phones, computer accessories, and monitors, when compared with previously existing standard or ad hoc proprietary interfaces. [12] a b "Cables and Long-Haul Solutions". USB 2.0 Frequently Asked Questions. USB Implementers Forum. Archived from the original on 18 January 2011 . Retrieved 28 April 2019. Micro-USB was embraced as the "Universal Charging Solution" by the International Telecommunication Union (ITU) in October 2009. [18] Galbraith, Jim (2 January 2014). "What you need to know about Thunderbolt 2". Macworld. IDG Communications, Inc. Archived from the original on 24 June 2021 . Retrieved 18 June 2021. There are so-called cables with A plugs on both ends, which may be valid if the "cable" includes, for example, a USB host-to-host transfer device with two ports. [3] This is, by definition, a device with two logical B ports, each with a captive cable, not a cable with two A ends.

Garney, John (June 1996). "An Analysis of Throughput Characteristics of Universal Serial Bus" (PDF). USB 3.2 Specification Language Usage Guidelines from USB-IF" (PDF). Archived (PDF) from the original on 3 November 2021 . Retrieved 4 September 2019.

Please note:

USB Logo Usage Guidelines" (PDF). USB Implementers Forum. Archived (PDF) from the original on 9 January 2022 . Retrieved 13 February 2022. Brant, Tom (4 March 2019). "Thunderbolt 3 Merges With USB to Become USB4". PC Magazine. Archived from the original on 5 March 2019 . Retrieved 4 March 2019.