USB 3.0 Standard-A, Standard-B, Powered-B connectors". Pinouts guide. Archived from the original on 14 May 2016. Eight ways the iMac changed computing". Macworld. 15 August 2008. Archived from the original on 22 December 2011 . Retrieved 5 September 2017. High-speed USB2.0 hubs contain devices called transaction translators that convert between high-speed USB2.0 buses and full and low speed buses. There may be one translator per hub or per port. Definition of: how to install a PC peripheral". PC. Ziff Davis. Archived from the original on 22 March 2018 . Retrieved 17 February 2018. USB4 Specification Language Usage Guidelines from USB-IF" (PDF). Archived (PDF) from the original on 13 November 2021 . Retrieved 13 February 2022.

Popular Mechanics: Making Connections". Popular Mechanics Magazine. Hearst Magazines: 59. February 2001. ISSN 0032-4558. Archived from the original on 15 February 2017. The different A and B plugs prevent accidentally connecting two power sources. However, some of this directed topology is lost with the advent of multi-purpose USB connections (such as USB On-The-Go in smartphones, and USB-powered Wi-Fi routers), which require A-to-A, B-to-B, and sometimes Y/splitter cables. See the USB On-The-Go connectors section below for a more detailed summary description. USB4 particularly supports the tunneling of the Thunderbolt 3 protocols, namely PCI Express (PCIe, load/store interface) and DisplayPort (display interface). USB4 also adds host-to-host interfaces. [2] Upstream USB connectors supply power at a nominal 5V DC via the V_BUS pin to downstream USB devices.Popularized by Microsoft as Windows Easy Transfer, the Microsoft utility used a special USB bridge cable to transfer personal files and settings from a computer running an earlier version of Windows to a computer running a newer version. In the context of the use of Windows Easy Transfer software, the bridge cable can sometimes be referenced as Easy Transfer cable.

Media Agnostic USB v1.0a Spec and Adopters Agreement". usb.org. Archived from the original on 31 July 2021 . Retrieved 21 July 2021. Powerbook Explodes After Comcast Plugs in Wrong Cable". Consumerist. 8 March 2010. Archived from the original on 25 June 2010 . Retrieved 22 June 2010. USB 3.0 Specification Now Available" (PDF) (Press release). San Jose, Calif. 17 November 2008. Archived from the original (PDF) on 31 March 2010 . Retrieved 22 June 2010– via usb.org. 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. In addition to standard USB, there is a proprietary high-powered system known as PoweredUSB, developed in the 1990s, and mainly used in point-of-sale terminals such as cash registers.The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required, and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device. If an application on the B-device requires the role of host, then the Host Negotiation Protocol (HNP) is used to temporarily transfer the host role to the B-device.

The PCI Express function of USB4 replicates the functionality of previous versions of the Thunderbolt specification. Device Firmware Upgrade (DFU) is a vendor- and device-independent mechanism for upgrading the firmware of USB devices with improved versions provided by their manufacturers, offering (for example) a way to deploy firmware bug fixes. During the firmware upgrade operation, USB devices change their operating mode effectively becoming a PROM programmer. Any class of USB device can implement this capability by following the official DFU specifications. [58] [62] [63] USB Class Codes". 22 September 2018. Archived from the original on 22 September 2018 – via www.usb.org. For a product developer, using USB requires the implementation of a complex protocol and implies an "intelligent" controller in the peripheral device. Developers of USB devices intended for public sale generally must obtain a USB ID, which requires that they pay a fee to the USB Implementers Forum (USB-IF). Developers of products that use the USB specification must sign an agreement with the USB-IF. Use of the USB logos on the product requires annual fees and membership in the organization. [12] History [ edit ] The basic USB trident logo [15] USB logo on the head of a standard Type-A (Standard-A) plug

Please note:

a b "Universal Serial Bus 2.0 Specification" (ZIP) (Revision 2.0ed.). USB Implementers Forum. 27 April 2000 . Retrieved 27 April 2023. A stream pipe is a uni-directional pipe connected to a uni-directional endpoint that transfers data using an isochronous, [54] interrupt, or bulk transfer:

Barnatt, Christopher (25 September 2022). Explaining USB: From 1.0 to USB4 V2.0 (ExplainingComputers) (video). USB 3.1 - Type-C Host to Host". superuser.com. Archived from the original on 14 October 2021 . Retrieved 21 July 2021. Battery Charging v1.1 Spec and Adopters Agreement". USB.org. Archived from the original on 11 January 2021 . Retrieved 31 July 2019. USB Connector, With Pegs, Micro USB Type B, USB 2.0, Receptacle, 5 Ways, Surface Mount, Right AngleBecause of the previous confusing naming schemes, USB-IF decided to change it once again. As of 2 September 2022, marketing names follow the syntax "USB xGbps", where x is the speed of transfer in Gb/s. [44] Overview of the updated names and logos can be seen in the adjacent table. 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).