Apple's Lightning to Micro-USB adapter now available in US, not just Europe anymore", Engadget, 3 November 2012, archived from the original on 26 June 2017 Portable devices having a USB On-The-Go port may want to charge and access a USB peripheral simultaneously, yet having only a single port (both due to On-The-Go and space requirement) prevents this. Accessory charging adapters (ACA) are devices that provide portable charging power to an On-The-Go connection between host and peripheral.

The Type-B plug: This plug has a near square cross-section with the top exterior corners beveled. As part of a removable cable, it inserts into an upstream port on a device, such as a printer. On some devices, the Type-B receptacle has no data connections, being used solely for accepting power from the upstream device. This two-connector-type scheme (A/B) prevents a user from accidentally creating a loop. [9] [10] USB Sleep-and-Charge Ports". toshiba.com. Archived from the original on 14 December 2014 . Retrieved 21 December 2014. PoweredUSB is a proprietary extension that adds four pins supplying up to 6A at 5V, 12V, or 24V. It is commonly used in point of sale systems to power peripherals such as barcode readers, credit card terminals, and printers. Howse, Brett. "USB Type-C Connector Specifications Finalized". AnandTech. Archived from the original on March 18, 2017 . Retrieved April 24, 2017. The USB1.1 standard specifies that a standard cable can have a maximum length of 5 meters (16ft 5in) with devices operating at full speed (12Mbit/s), and a maximum length of 3 meters (9ft 10in) with devices operating at low speed (1.5Mbit/s). [35] [36] [37]Some USB devices require more power than is permitted by the specifications for a single port. This is common for external hard and optical disc drives, and generally for devices with motors or lamps. Such devices can use an external power supply, which is allowed by the standard, or use a dual-input USB cable, one input of which is for power and data transfer, the other solely for power, which makes the device a non-standard USB device. Some USB ports and external hubs can, in practice, supply more power to USB devices than required by the specification but a standard-compliant device may not depend on this.

Universal phone charger standard approved—One-size-fits-all solution will dramatically cut waste and GHG emissions". ITU (press release). Pressinfo. 22 October 2009. Archived from the original on 5 November 2009 . Retrieved 4 November 2009. Revision 1.2 of the specification was released in 2010. It made several changes, and increased limits including allowing 1.5A on charging downstream ports for unconfigured devices—allowing High Speed communication while having a current up to 1.5A. Also, support was removed for charging port detection via resistive mechanisms. [52] a b "USB Frequently Asked Questions: Cables and Long-Haul Solutions". USB.org. Archived from the original on January 15, 2014 . Retrieved May 22, 2023.High-power devices in USB 2.0 are those draw more than one unit load (up to a maximum of 5 unit loads). 1 unit load is 100mA. In addition to limiting the total average power used by the device, the USB specification limits the inrush current (i.e., the current used to charge decoupling and filter capacitors) when the device is first connected. Otherwise, connecting a device could cause problems with the host's internal power. USB devices are also required to automatically enter ultra low-power suspend mode when the USB host is suspended. Nevertheless, many USB host interfaces do not cut off the power supply to USB devices when they are suspended. [100] Agreement on Mobile phone Standard Charger" (Press release). GSM World. Archived from the original on 17 February 2009.

Universal Serial Bus Revision 3.0 Specification, Sections 3.1.1.1 and 5.3.1.3". Usb.org. Archived from the original (ZIP) on 19 May 2014 . Retrieved 28 April 2019. What is the Difference between USB Type A and USB Type B Plug/Connector?". Archived from the original on February 7, 2017. Note that a mini-AB receptacle accepts both mini-A and mini-B cables. So if your cables really have different plugs than they can be used interchangeably only if all your devices have mini-AB receptacles. The standard connectors were designed to be more robust than many past connectors. This is because USB is hot-swappable, and the connectors would be used more frequently, and perhaps with less care, than previous connectors. Universal Phone Charger Standard Approved" (Press release). ITU. October 22, 2009. Archived from the original on March 27, 2010 . Retrieved May 22, 2023.

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Connector properties [ edit ] Non-standard "USB extension cable", plug on the left, receptacle on the right. (USB does not allow extension cables. Non-standard cables may work but cannot be presumed reliable.) Part 2 - Electrical". MQP Electronics. Archived from the original on December 24, 2014 . Retrieved December 29, 2014. What Is the USB 3.0 Cable Difference". Hantat. May 18, 2009. Archived from the original on December 11, 2011 . Retrieved December 12, 2011. USB ports and connectors are often color-coded to distinguish their different functions and USB versions. These colors are not part of the USB specification and can vary between manufacturers; for example, the USB3.0 specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB3.0 connectors and plugs. [8] Connector types [ edit ] In the case of sat nav systems, mini USB cables provide a reliable solution for charging the device and ensuring continuous power during navigation. They allow users to keep their sat nav devices charged and ready for use, ensuring uninterrupted guidance on the road.