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Devices that need more than mA or higher than 5 volts must provide their own power. When USB devices including hubs are first connected they are interrogated by the host controller, which enquires of each their maximum power requirements.

However, seems that any load connected to USB port may be treated by operating system as device. The host operating system typically keeps track of the power requirements of the USB network and may warn the computer's operator when a given segment requires more power than is available and may shut down devices in order to keep power consumption within the available resource.

The device will then not attempt to transmit or receive data, but can draw up to 1. Supplied voltage by a host or a powered hub ports is between 4.

Maximum voltage drop for bus-powered hubs is 0. All hubs and functions must be able to send configuration data at 4. Normal operational voltage for functions is minimum 4.

Shield should only be connected to Ground at the host. No device should connect Shield to Ground. Bookmark Ask a question Edit Submit New.

USB Universal Serial Bus designed to connect peripherals such as mice, keyboards, scanners, digital cameras, printers, hard disks, and networking components to PC.

It has become the standard connection method for wide variety of devices. There are some major USB versions known nowdays: Specifies data rates of 1.

According to reports in our database positive and 14 negative this pinout should be correct. Is this pinout correct. Source s of this and additional information: Last updated No portion of this webpage may be reproduced in any form without providing visible HTML link to Pinouts.

Webmaster permission required in any other cases. The enumeration starts by sending a reset signal to the USB device. The data rate of the USB device is determined during the reset signaling.

After reset, the USB device's information is read by the host and the device is assigned a unique 7-bit address. 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.

If the USB host is restarted, the enumeration process is repeated for all connected devices. The host controller directs traffic flow to devices, so no USB device can transfer any data on the bus without an explicit request from the host controller.

There may be one translator per hub or per port. Operating data rates for earlier devices are set in the legacy manner. This allows the host to load software modules for the device and to support new devices from different manufacturers.

At first intended for magnetic and optical drives, it has been extended to support flash drives.

It has also been extended to support a wide variety of novel devices as many systems can be controlled with the familiar metaphor of file manipulation within directories.

The process of making a novel device look like a familiar device is also known as extension. The ability to boot a write-locked SD card with a USB adapter is particularly advantageous for maintaining the integrity and non-corruptible, pristine state of the booting medium.

Though most personal computers since mid can boot from USB mass storage devices, USB is not intended as a primary bus for a computer's internal storage.

However, USB has the advantage of allowing hot-swapping , making it useful for mobile peripherals, including drives of various kinds.

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 current number and types of attached USB devices, and by the upper limit of the USB interface.

Another use for USB mass storage devices is the portable execution of software applications such as web browsers and VoIP clients with no need to install them on the host computer.

Media Transfer Protocol MTP was designed by Microsoft to give higher-level access to a device's filesystem than USB mass storage, at the level of files rather than disk blocks.

It also has optional DRM features. MTP was designed for use with portable media players , but it has since been adopted as the primary storage access protocol of the Android operating system from the version 4.

The primary reason for this is that MTP does not require exclusive access to the storage device the way UMS does, alleviating potential problems should an Android program request the storage while it is attached to a computer.

The main drawback is that MTP is not as well supported outside of Windows operating systems. Joysticks, keypads, tablets and other human-interface devices HIDs are also progressively [ when?

For mice and keyboards with dual-protocol support, an adaptor that contains no logic circuitry may be used: 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.

In addition to its intended legitimate purposes, DFU can also be exploited by uploading maliciously crafted firmware that causes USB devices to spoof various other device types; one such exploiting approach is known as BadUSB.

The USB Device Working Group has laid out specifications for audio streaming, and specific standards have been developed and implemented for audio class uses, such as microphones, speakers, headsets, telephones, musical instruments, etc.

The DWG has published three versions of audio device specifications: USB provides three isochronous fixed-bandwidth synchronization types, [56] all of which are used by audio devices: The connectors the USB committee specifies support a number of USB's underlying goals, and reflect lessons learned from the many connectors the computer industry has used.

The female connector mounted on the host or device is called the receptacle , and the male connector attached to the cable is called the plug.

By design, it is difficult to insert a USB plug into its receptacle incorrectly. The USB specification requires that the cable plug and receptacle be marked so the user can recognize the proper orientation.

USB cables and small USB devices are held in place by the gripping force from the receptacle, with no screws, clips, or thumb-turns as some connectors use.

The different A and B plugs prevent accidentally connecting two power sources. USB connector types multiplied as the specification progressed.

The connectors were different so that users could not connect one computer receptacle to another. The data pins in the standard plugs are recessed compared to the power pins, so that the device can power up before establishing a data connection.

Some devices operate in different modes depending on whether the data connection is made. Charging docks supply power and do not include a host device or data pins, allowing any capable USB device to charge or operate from a standard USB cable.

Charging cables provide power connections, but not data. In a charge-only cable, the data wires are shorted at the device end, otherwise the device may reject the charger as unsuitable.

High-power devices such as a typical 2. In addition to standard USB, there is a proprietary high-powered system known as PoweredUSB , developed in the s, and mainly used in point-of-sale terminals such as cash registers.

A USB connection is always between a host or hub at the A connector end, and a device or hub's "upstream" port at the other end. During USB communication, data is transmitted as packets.

Initially, all packets are sent from the host via the root hub, and possibly more hubs, to devices. Some of those packets direct a device to send some packets in reply.

At first, USB was considered a complement to IEEE FireWire technology, which was designed as a high-bandwidth serial bus that efficiently interconnects peripherals such as disk drives, audio interfaces, and video equipment.

In the initial design, USB operated at a far lower data rate and used less sophisticated hardware. It was suitable for small peripherals such as keyboards and pointing devices.

These and other differences reflect the differing design goals of the two buses: USB was designed for simplicity and low cost, while FireWire was designed for high performance, particularly in time-sensitive applications such as audio and video.

The chipset and drivers used to implement USB and FireWire have a crucial impact on how much of the bandwidth prescribed by the specification is achieved in the real world, along with compatibility with peripherals.

This has made PoE popular for VoIP telephones, security cameras , wireless access points , and other networked devices within buildings.

Ethernet standards require electrical isolation between the networked device computer, phone, etc. This gives Ethernet a significant safety advantage over USB with peripherals such as cable and DSL modems connected to external wiring that can assume hazardous voltages under certain fault conditions.

USB is competitive for low-cost and physically adjacent devices. However, Power over Ethernet and the MIDI plug standard have an advantage in high-end devices that may have long cables.

USB can cause ground loop problems between equipment, because it connects ground references on both transceivers.

This is an increasing disadvantage compared to USB. Even though USB 3. Various protocol converters are available that convert USB data signals to and from other communications standards.

From Wikipedia, the free encyclopedia. For other uses, see USB disambiguation. USB mass storage device class , Disk enclosure , and External hard disk drive.

USB human interface device class. Computing portal Electronics portal. Archived from the original PDF on 13 March Retrieved 12 March Archived PDF from the original on 19 May Retrieved 4 June Archived from the original on 6 April Retrieved 12 December Retrieved 17 February Archived from the original on 3 January Retrieved 12 February Archived from the original on 4 November Archived from the original on 26 August Retrieved 23 September Archived from the original on 12 November Retrieved 23 October The ins and outs of USB".

Archived from the original on Archived from the original on 22 December Retrieved 5 September Archived from the original on 22 October Archived from the original on 23 September Archived from the original on 15 February Archived from the original on 19 May — via www.

Retrieved 29 December — via www. Archived from the original on 28 June Retrieved 20 February Archived from the original on 23 February Archived from the original on 24 January Archived PDF from the original on 29 December Archived PDF from the original on 30 January Archived PDF from the original on 2 November Archived from the original on 3 December Archived from the original on 6 October Retrieved 5 October Archived from the original PDF on 31 March Retrieved 22 June — via usb.

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Quality Logo Products, Inc. Archived from the original on 29 December Retrieved 30 December Archived from the original on 27 July Retrieved 27 July Archived from the original ZIP on 28 May Retrieved 8 September Archived from the original PDF on 17 August Retrieved 21 November Archived from the original on 22 September — via www.

This base class is defined to use in device descriptors to indicate that class information should be determined from the Interface Descriptors in the device.

Retrieved 10 May — via sdpha2. Archived PDF from the original on 11 October Archived from the original on 2 December Retrieved 30 October Archived from the original on 6 July Archived from the original PDF on Archived from the original PDF on 8 August

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