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Look for debris in the USB port. These ports are wide open whenever you don't have a device plugged in so it's easy for debris, like dust or food, to get wedged inside.
If you see anything stuck inside, shut your computer down and gently remove the obstruction with a thin plastic or wooden implement like a toothpick.
In some cases, a product like canned air can be useful in blowing obstructions out of a USB port. Just be careful not to shove the obstruction further in.
Check for loose or broken internal connections. One way to test this is to insert your USB device and then gently wiggle the connection.
If it briefly connects and disconnects, then there is a physical problem with either the cable or the USB port.
If you feel a great deal of movement when you gently wiggle the USB connector, that indicates it may be bent or broken off the board. And while it is sometimes possible to fix this type of problem, you're probably better off taking it to a professional.
Try a different USB port. Many computers have more than one USB port, so a good way to rule out a single broken port is to unplug your USB device and try it in different ports.
Plug the USB device into a few of the ports on both the front and back of your computer. If the device doesn't work in any of the ports, there's likely a problem with its hardware.
If your device starts working when plugged into different ports, then the first port probably has a physical problem that needs to be fixed.
It's also possible that there's a connection problem with all of the USB ports on the front or the back, which is why it's important to try more than one on both sides.
Swap to a different USB cable. These types of equipment are most commonly used for computer networking:. Some devices feature more than one USB port, but do not plug both ends of a cable into the same device, as this can cause electrical damage!
Follow the instructions provided with your equipment before unplugging USB cables. For this reason, it is good practice to always safely eject your USB device before physically unplugging it.
If using a USB hub, plug a separate cable into each device and connect them to the hub individually. Several major types of physical layouts exist for USB ports:.
To connect a device having one kind of port per device with another type, simply use the correct type of cable with appropriate interfaces on each end.
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?
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.
One consequence of this is that USB devices after being re-flashed may act as various unexpected device types. For example, a USB Device that the seller intends to be just a Flash drive can "spoof" an input device like a keyboard.
See 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.
UAC 2. UAC 3. UAC 1. USB provides three isochronous fixed-bandwidth synchronization types,  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.
A Bridge Cable is a special cable with a chip and active electronics in the middle of the cable. The chip in the middle of the cable acts as a peripheral to both computers, and allows for peer-to-peer communication between the computers.
Popularized by Microsoft as Windows Easy Transfer , the Microsoft utility used a special USB Bridge Cable to transfer personal files and settings from a computer running an earlier version of Windows to a computer running a newer version.
You may be able to find references as "Easy Transfer Cable". Despite USB 3. These are not meant for data transfer but are aimed at diagnostic uses.
Under the most recent specifications, USB supports most scenarios connecting systems directly with a Type-C cable. For the capability to work, however, connected systems must must support role-switching, Dual-role capabilities requires there be TWO controllers within the system, as well as a Role Controller; while this can be expected in a mobile platform such as a Tablet or a phone, desktop PCs often will not support dual roles, and Laptops are equally unlikely to support the dual role.
Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices when starting out as unconfigured.
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.
The IEEE 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. Thunderbolt 3 uses the USB-C connector. After the specification was made royalty-free and custodianship of the Thunderbolt protocol was transferred from Intel to the USB Implementers' Forum, Thunderbolt 3 has been effectively implemented in the USB4 specification — with compatibility with Thunderbolt 3 optional but encouraged for USB4 products — with Thunderbolt 4 being applied to products that are compatible with USB4's complete feature set.
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. Main article: USB 3. Main article: USB4. See also: Picture Transfer Protocol.
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