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However, a USB port can be connected to a gateway that accesses distant devices. USB has a strict "tree" topology and "master-slave" protocol for addressing peripheral devices; peripheral devices cannot interact with one another except via the host, and two hosts cannot communicate over their USB ports directly.
A host cannot "broadcast" signals to all peripherals at once, each must be addressed individually. Some very high speed peripheral devices require sustained speeds not available in the USB standard.
For a product developer, use of USB requires implementation of a complex protocol and implies an "intelligent" controller in the peripheral device.
Developers of products that use the USB specification must sign an agreement with Implementer's Forum. Use of the USB logos on the product require annual fees and membership in the organization.
A group of seven companies began the development of USB in A team including Ajay Bhatt worked on the standard at Intel;   the first integrated circuits supporting USB were produced by Intel in The first widely used version of USB was 1.
As of [update] , approximately 6 billion USB ports and interfaces were in the global marketplace, and about 2 billion were being sold each year.
Though many designs for a miniaturised type B connector appeared on many peripherals, conformity to the USB 1.
There was no known miniature type A connector until USB 2. SuperSpeed plugs and receptacles are identified with a distinct logo and blue inserts in standard format receptacles.
The SuperSpeed bus provides for a transfer mode at a nominal rate of 5. Its efficiency is dependent on a number of factors including physical symbol encoding and link level overhead.
The increase in bandwidth is a result of multi-lane operation over existing wires that were intended for flip-flop capabilities of the Type-C connector.
A USB system consists of a host with one or more downstream ports, and multiple peripherals, forming a tiered- star topology. Additional USB hubs may be included, allowing up to five tiers.
A USB host may have multiple controllers, each with one or more ports. Up to devices may be connected to a single host controller.
The hub built into the host controller is called root hub. A USB device may consist of several logical sub-devices that are referred to as device functions.
A composite device may provide several functions, for example, a webcam video device function with a built-in microphone audio device function.
An alternative to this is compound device , in which the host assigns each logical device a distinctive address and all logical devices connect to a built-in hub that connects to the physical USB cable.
USB device communication is based on pipes logical channels. A pipe is a connection from the host controller to a logical entity, found on a device, and named an endpoint.
Because pipes correspond to endpoints, the terms are sometimes used interchangeably. An endpoint is defined and numbered by the device during initialization the period after physical connection called "enumeration" and so is relatively permanent, whereas a pipe may be opened and closed.
There are two types of pipe: A message pipe is bi-directional and is used for control transfers. Message pipes are typically used for short, simple commands to the device, and a status response, used, for example, by the bus control pipe number 0.
A stream pipe is a uni-directional pipe connected to a uni-directional endpoint that transfers data using an isochronous ,  interrupt , or bulk transfer:.
If the transfer is from the host to the endpoint, the host sends an OUT packet a specialization of a TOKEN packet with the desired device address and endpoint number.
If the data transfer is from the device to the host, the host sends an IN packet instead. If the destination endpoint is a uni-directional endpoint whose manufacturer's designated direction does not match the TOKEN packet e.
Otherwise, it is accepted and the data transaction can start. Endpoints are grouped into interfaces and each interface is associated with a single device function.
An exception to this is endpoint zero, which is used for device configuration and is not associated with any interface. A single device function composed of independently controlled interfaces is called a composite device.
A composite device only has a single device address because the host only assigns a device address to a function.
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,  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.
As I said before, I've tried with 3 different mice now. They are all high-end "gaming" mice so they should have no delay normally.
Download latencymon search it google. It shows what driver exactly is causing the latency. Start it and check for high latencys red.
It could already register lag when you cant feel it but defindetly when it happens keep it backround and check afterwards.
You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long.
At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results.
Check for BIOS updates. LatencyMon has been analyzing your system for 0: Windows 8 , 6. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.
The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution. Process with highest pagefault count: Just ran another 2 min test, I changed nothing.
Also played Overwatch for like 5 mins after each test and I can say that the input lag still exists. I think a software like this couldn't detect the latency I'm having because I think it's some connectivity issue within the USB slots, so the lag is BEFORE a signal goes into the system from the mouse.
But Im not sure if that is possible. As I said, is it possible to have a USB slot working properly but having latency caused by the connectivity?
Anyways, here is the second test: Also go to control panel and unstall a program. Delete all Dell related programs from there. Post another latencymon report afterwards.
Alright uninstalling all of them. Will try the latencymon in like 10 mins. If this is the solution you might update them back accidentally by dell updates or windows update, disabling dell updates is possible but you can miss on something like new bios updates which can be helpful so you need to check those manually.
Dont disable windows update completely but change it to download updates but ask you before installing. In time you will see if those dell programs are recommended or optional updates.
If only optional you can put automatic install and update in windows update. Ok so here it is. Now I must say, I was browsing web while running this test but I don't think that would affect the test much.
The test states that I should disable WLAN adapter, but since this is a laptop that I use in many different places, disabling WLAN will make it a lot harder for me to stay connected to internet.
I'll try it with Overwatch for like 10 mins, will report back here. Remember to reboot after uninstalling programs and did you disable "Dell Diag Control Device" and "Dell System Analyzer Control Device" both in device manager under system devices?
Hmm ndis is networking driver. Are you using Wifi or ethernet cable connected? Are you using VPN of any sort? Yes I rebooted after every single change that I made.
I have to use wifi actually. But if it is absolutely clear that the problem is caused by the wifi adapter I will have no choice but use ethernet.
By the way I'm using no VPN as far as i remember. Is there a way to check those stuff? Now I'll try to boot in safe mode and try again.
Huge thanks for your help by the way. Get fast, free shipping with Amazon Prime. Everything you need for the holidays.
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