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] The Chinese technical standard: "YD/T 1591-2006, Technical Requirements and Test Method of Charger and Interface for Mobile Telecommunication Terminal Equipment" (PDF). Dian yuan (in Chinese). Archived from the original (PDF) on 15 May 2011. Common Charging and Local Data Connectivity". Open Mobile Terminal Platform. February 11, 2009. Archived from the original on March 29, 2009 . Retrieved February 11, 2009.

However, these teething problems are no longer common. The tech community is always keen to embrace the future, and work has been done to resolve initial issues. Its prevalence indicates confidence in USB-C. It is now standard on many devices from major manufacturers like Microsoft and Intel. In fact, the European Union has proposed to have all electronic devices only fit USB-C to reduce e-waste and increase convenience. It’s only a matter of time before USB-C will be the standard. Final Thoughts

There is also the USB Type B Mini, primarily found on digital cameras, USB hubs, and external hard drives, and the USB Type B Micro which is used by modern Android phones. USB Type C The limit to device power draw is stated in terms of a unit load which is 100mA for USB 2.0, or 150mA for SuperSpeed (i.e. USB 3. x) devices. Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices before they are configured. A high-powered device must be configured, after which it may draw up to 5 unit loads (500mA), or 6 unit loads (900mA) for SuperSpeed devices, as specified in its configuration because the maximum power may not always be available from the upstream port. [43] [44] [45] [46] a b Kumar, Ajay; Winkelman, Steven; LeClair, Dave (July 27, 2022). "What Is Fast Charging?". PCMag . Retrieved May 21, 2023. 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 USB 3.2 Gen 2×2 is quite popular nowadays and offers a top speed of 20 Gbps using 2-lane operation (hence the name 2×2). This version is only compatible with USB Type C design. Since it offers considerably faster data transfer and charging speeds, most modern smartphones and even some laptops support this USB version. USB 4.0

Mobile phones to adopt new, smaller USB connector" (PDF) (Press release). USB Implementers Forum. 4 January 2007. Archived (PDF) from the original on 8 January 2007 . Retrieved 8 January 2007. It is safe to say that almost all electronic devices, including smartphones, laptops, tablets, desktops, Bluetooth speakers, and so on, rely on USB ports and cables for various functions.Unlike other data buses (such as Ethernet), USB connections are directed; a host device has "downstream" facing ports that connect to the "upstream" facing ports of devices. Only downstream facing ports provide power; this topology was chosen to easily prevent electrical overloads and damaged equipment. Thus, USB cables have different ends: A and B, with different physical connectors for each. Each format has a plug and receptacle defined for each of the A and B ends. A USB cable, by definition, has a plug on each end—one A (or C) and one B (or C)—and the corresponding receptacle is usually on a computer or electronic device. The mini and micro formats may connect to an AB receptacle, which accepts either an A or a B plug, that plug determining the behavior of the receptacle. Micro-USB was embraced as the "Universal Charging Solution" by the International Telecommunication Union (ITU) in October 2009. [18] Universal Serial Bus Type-C Cable and Connector Specification, Release 2.2. USB Implementers Forum (Technical report). USB 3.0 Promoter Group. October 2022 . Retrieved April 12, 2023. Often referred to as “male”, as they plug into a “female” port, it is important to understand that there are two elements of USB standard to consider; the physical connector shape and the underlying protocol (speed). USB Type A

Just like USB-A, it’s the original designation for the two ends of a non-symmetrical cable. The differing form of USB-A and USB-B helps to enforce the mono-directional aspect of these iterations of USB. Data flow is bi-directional, but power may only flow from the host to the peripheral or receptor end and, therefore, the cable can only be connected in one way.USB cables exist with various combinations of plugs on each end of the cable, as displayed below in the USB cables matrix. 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]

USB-C is relatively new, so there have been some issues. Some early users complained that the standard is trying to do too much for all devices; an inevitable risk of bringing a universal solution into a complicated ecosystem. Since USB-C is a standard, actual implementations may vary, and they may not support all modes of operation. The GSM Association (GSMA) followed suit on February 17, 2009, [88] [89] [90] [91] and on April 22, 2009, this was further endorsed by the CTIA – The Wireless Association, [92] with the International Telecommunication Union (ITU) announcing on October 22, 2009, that it had also embraced the Universal Charging Solution as its "energy-efficient one-charger-fits-all new mobile phone solution," and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating—up to three times more energy-efficient than an unrated charger." [93] EU smartphone power supply standard [ edit ] As of 14June2007 [update], all new mobile phones applying for a license in China are required to use a USB port as a power port for battery charging. [83] [84] This was the first standard to use the convention of shorting D+ and D− in the charger. [85] OMTP/GSMA Universal Charging Solution [ edit ]Battery Charging v1.2 Spec and Adopters Agreement" (Zip). USB Implementers Forum. March 15, 2012. Archived from the original on October 6, 2014 . Retrieved May 13, 2021. Then, in September 2017, USB 3.2 was released. There are four versions of USB 3.2: Gen 1×1, Gen 1×2, Gen 2×1, and Gen 2×2. New EU standards for common mobile phone charger (press release), Europa, archived from the original on 3 January 2011