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Several manufacturers offer external portable USB hard disk drives, or empty enclosures for disk drives. These offer performance comparable to internal drives, limited by the number and types of attached USB devices, and by the upper limit of the USB interface. Other competing standards for external drive connectivity include eSATA, ExpressCard, FireWire (IEEE 1394), and most recently Thunderbolt. Pros Seem to Outdo Cons in New Phone Charger Standard". News.com. September 20, 2007 . Retrieved November 26, 2007. Universal Serial Bus 2.0 Specification, Section 7.2.1.3 Low-power Bus-powered Functions" (ZIP). usb.org. 27 April 2000. Archived from the original on 10 September 2013 . Retrieved 11 January 2014. Proprietary Cables vs Standard USB". anythingbutipod.com. 30 April 2008. Archived from the original on 13 November 2013 . Retrieved 29 October 2013. 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 ]
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Low-power and high-power devices remain operational with this standard, but devices using SuperSpeed can take advantage of increased available current of between 150mA and 900mA, respectively. [30] :9–9 Commission welcomes new EU standards for common mobile phone charger". Press Releases. Europa. December 29, 2010. Archived from the original on March 19, 2011 . Retrieved May 22, 2011. While converters exist between certain legacy interfaces and USB, they might not provide a full implementation of the legacy hardware. For example, a USB-to-parallel-port converter might work well with a printer, but not with a scanner that requires bidirectional use of the data pins. 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). 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.Upstream USB connectors supply power at a nominal 5 V DC via the V_BUS pin to downstream USB devices. A USB connection is always between an A end, either a host or a downstream port of a hub, and a B end, either a peripheral device or the upstream port of a hub. Historically this was made clear by the fact that hosts had only Type-A ports and peripheral devices had only Type-B, and every (valid) cable had one Type-A plug and one Type-B plug. USB-C (Type-C) is a single connector that replaces all Type-A and Type-B connectors ( legacy connectors), so when both sides are modern equipment with USB-C ports they negotiate which is the host (A) and which is the device (B).
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You don't have permission to access "http://www.argos.co.uk/browse/technology/computer-accessories/computer-cables/c:30054/type:usb/" on this server. A mix of USB specifications and their marketing names are being displayed because specifications are sometimes wrongly used as marketing names.) [ disputed(for: USB4 20Gbps does not exist; USB4 2×2 is not interchangeable with USB 3.2 2×2 as indicated by the logo; logos for USB 3.x and USB4 are different.) – discuss] 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. a b Kumar, Ajay; Winkelman, Steven; LeClair, Dave (July 27, 2022). "What Is Fast Charging?". PCMag . Retrieved May 21, 2023.USB2.0 provides for a maximum cable length of 5 meters (16ft 5in) for devices running at high speed (480Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost. When adding USB device response time, delays from the maximum number of hubs added to the delays from connecting cables, the maximum acceptable delay per cable amounts to 26ns. [37] The USB2.0 specification requires that cable delay be less than 5.2ns/m ( 1.6ns/ft, 192 000 km/s), which is close to the maximum achievable transmission speed for standard copper wire.
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a b c d "Battery Charging Specification, Revision 1.2". USB Implementers Forum. 15 March 2012. Archived from the original on 10 March 2021 . Retrieved 13 August 2021. The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of the USB standard gave rise to another family of connectors to permit additional data paths. All versions of USB specify cable properties; version 3. x cables include additional data paths. The USB standard included power supply to peripheral devices; modern versions of the standard extend the power delivery limits for battery charging and devices requiring up to 240 watts. USB has been selected as the standard charging format for many mobile phones, reducing the proliferation of proprietary chargers.The Micro-AB receptacle is capable of accepting Micro-A and Micro-B plugs, attached to any of the legal cables and adapters as defined in revision 1.01 of the Micro-USB specification. The maximum allowed cross-section of the overmold boot (which is part of the connector used for its handling) is 16 by 8mm (0.63 by 0.31in) for the Standard-A plug type, while for the Type-B it is 11.5 by 10.5mm (0.45 by 0.41in). [2] Mini connectors [ edit ] Mini-A (left) and Mini-B (right) plugs 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] 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. USB Connector, With Pegs, Micro USB Type B, USB 2.0, Receptacle, 5 Ways, Surface Mount, Right Angle
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During CES 2020, USB-IF and Intel stated their intention to allow USB4 products that support all the optional functionality as Thunderbolt 4 products. The first products compatible with USB4 are expected to be Intel's Tiger Lake series and AMD's Zen 3 series of CPU, released in 2020. 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] Broad Manufacturer Agreement Gives Universal Phone Cable Green Light" (Press release). OTMP. September 17, 2007. Archived from the original on June 29, 2009 . Retrieved November 26, 2007. The 24-pin double-sided connector provides four power–ground pairs, two differential pairs for USB2.0 data (though only one pair is implemented in a USB-C cable), four pairs for SuperSpeed data bus (only two pairs are used in USB 3.1 mode), two "sideband use" pins, V CONN +5V power for active cables, and a configuration pin for cable orientation detection and dedicated biphase mark code (BMC) configuration data channel. [27] [28] Type-A and Type-B adaptors and cables are required for older hosts and devices to plug into USB-C hosts and devices. Adapters and cables with a USB-C receptacle are not allowed. [29] Low-speed (LS) and Full-speed (FS) modes use a single data wire pair, labeled D+ and D−, in half-duplex. Transmitted signal levels are 0.0–0.3 V for logical low, and 2.8–3.6 V for logical high level. The signal lines are not terminated.Mini-USB connectors were introduced together with USB 2.0 in April 2000, for use with smaller devices such as digital cameras, smartphones, and tablet computers. The Mini-A connector and the Mini-AB receptacle connector have been deprecated since May 2007. [11] Mini-B connectors are still supported, but are not On-The-Go-compliant; [12] the Mini-B USB connector was standard for transferring data to and from the early smartphones and PDAs. Both Mini-A and Mini-B plugs are approximately 3 by 7mm (0.12 by 0.28in). The Mini-AB receptacle accepts either a Mini-A or Mini-B plug. The USB Power Delivery specification revision2.0 (USB PD Rev. 2.0) has been released as part of the USB3.1 suite. [56] [64] [65] It covers the USB-C cable and connector with a separate configuration channel, which now hosts a DC coupled low-frequency BMC-coded data channel that reduces the possibilities for RF interference. [66] Power Delivery protocols have been updated to facilitate USB-C features such as cable ID function, Alternate Mode negotiation, increased V BUS currents, and V CONN-powered accessories. Oppo Super VOOC Flash Charge, are also known as Dash Charge or Warp Charge on OnePlus devices and Dart Charge on Realme devices Meeting the challenge of the universal charge standard in mobile phones". Planet Analog. Archived from the original on September 9, 2012 . Retrieved June 22, 2010. USB Power Delivery" (PDF). usb.org. USB-IF. October 20, 2016. Archived from the original (PDF) on December 20, 2016.
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