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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. OTG devices attached either to a peripheral-only B-device or a standard/embedded host have their role fixed by the cable, since in these scenarios it is only possible to attach the cable one way. Per the base specification, any device attached to a standard downstream port (SDP) must initially be a low-power device, with high-power mode contingent on later USB configuration by the host.
The throughput of each USB port is determined by the slower speed of either the USB port or the USB device connected to the port. The Chinese technical standard: "YD/T 1591-2006, Technical Requirements and Test Method of Charger and Interface for Mobile Telecommunication Terminal Equipment" (PDF). Unlike Type-A and Type-B connectors, female USB-C ports can accept a male USB-C plug inserted either way up, as the terminals at both port and plug are completely symmetrical. An exception to this is endpoint zero, which is used for device configuration and is not associated with any interface. eSATAp support can be added to a desktop machine in the form of a bracket connecting the motherboard SATA, power, and USB resources.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. Various legacy USB and related connectors (left to right): USB Micro-B plug, proprietary UC-E6 plug, USB Mini-B plug, Standard-A-like receptacle (non-compliant), Standard-A plug, Standard-B plug. Only downstream facing ports provide power; this topology was chosen to easily prevent electrical overloads and damaged equipment.
Various protocol converters are available that convert USB data signals to and from other communications standards.Apple, one of the original MoU signers, makes Micro-USB adapters available—as permitted in the Common EPS MoU—for its iPhones equipped with Apple's proprietary 30-pin dock connector or (later) Lightning connector. Before this, there was a much wider variety of different connectors commonly used for linking PCs and compatible hardware. A number of extensions to the USB Specifications have progressively further increased the maximum allowable V_BUS voltage: starting with 6. A type of USB3 Tunneling architecture where the Enhanced SuperSpeed protocol is extended to allow operation at the maximum bandwidth available on the USB4 Link. 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.
specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB3. citation needed] Active converters that connect USB keyboards and mice (usually one of each) to PS/2 ports also exist.
To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4. If the device is supported by the host, the device drivers needed for communicating with the device are loaded and the device is set to a configured state. Most USB types will be compatible with all generations of USB standard, but newer gen ports will be faster. However, you will still find these small connectors on devices that do not yet come with a Type-C port as standard. A mix of USB specifications and their marketing names are being displayed because specifications are sometimes wrongly used as marketing names.
USB-PD A and B plugs have a mechanical mark while Micro plugs have a resistor or capacitor attached to the ID pin indicating the cable capability.
A variety of (non-USB) standards support charging devices faster than the USB Battery Charging standard.
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