Usb &Amp; Otg Giá Cực Tốt

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With each new version, USB ports và connectors have become progressively more functional, paving the way for smaller, lighter and more portable devices. However, as new standards bring more speed, power and versatility khổng lồ market, they also bring a complex assortment of features và capabilities to consider when deciding which cable or peripheral is right for your application.

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What is USB?

In the 1990s, office desktops were a tangled mess of serial, parallel and proprietary cables. Universal Serial Bus (USB) changed all of that, simplifying computer connectivity through a small, inexpensive interface: the USB Type-A (USB-A) port/connector. With billions of USB devices now in daily use, USB is the dominant wired interface for laptops, tablets and phones.

USB has evolved through a series of standards (see Table 1) that specify how cables connect, communicate and supply power to lớn computers, smartphone devices và peripherals. The latest iteration is USB4 and, lượt thích previous versions, it represents another leap forward in data transfer speed, video clip resolution & power.


Types of USB Ports và Connectors

On computers, tablets và peripherals you will typically find at least one of these three different types of USB ports. On newer devices, USB‐C is preferred for its small size, fast data transfer rate & ability to carry up khổng lồ 240W of power. USB‐C cables can also carry high‐resolution 4K và 8K video. Lightning is similar in function to USB‐C but uses a different connector.


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USB-A
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USB-B
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USB-B Mini
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USB-B Micro
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USB-C
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Lightning

USB-C Lanes & Speeds

To understand USB data transfer rates, you need to lớn know a little about the kiến thiết of the USB-C connector. A USB Type-C connector has four pairs of pins known as "lanes" that transmit (TX) & receive (RX) data (see highlighted pins in Figure 1 below). USB 3.0 (5 Gbps) và USB 3.1 (10 Gbps) use one TX lane & one RX lane, depending on the orientation of the connector. USB 3.2 takes advantage of all four lanes to achieve a trăng tròn Gbps data rate.


Figure 1: USB-C Connector Pin-outs


The naming convention recently adopted for USB 3.2 incorporates tốc độ x lanes. For example, USB 3.2 gen 1x2 means 5 Gbps x 2 lanes, for a connection speed of 10 Gbps.


SpecificationSignaling Rate/LaneNumber of LanesAggregate Bandwidth
USB 3.2 gen 1×1 5 Gbps (SuperSpeed)15 Gbps
USB 3.2 gene 2×110 Gbps (SuperSpeed+)110 Gbps
USB 3.2 gene 1×25 Gbps (SuperSpeed)210 Gbps
USB 3.2 gen 2×210 Gbps (SuperSpeed+)220 Gbps

The USB4 gen 2×2 specification (known by its kinh doanh name, USB4 20Gbps) & USB 3.2 ren 2×2 both offer đôi mươi Gbps connection. USB4 ren 3×2 (USB4 40Gbps) uses a different data encoding scheme khổng lồ achieve 20 Gbps per lane & 40 Gbps when in dual lane mode.


SpecificationSignaling Rate/LaneNumber of LanesAggregate Bandwidth
USB4 ren 2×210 Gbps220 Gbps
USB4 ren 3×220 Gbps240 Gbps

What's New in USB4?

USB 4 (officially "USB4" without the space) is an important update, not only for the new capabilities it offers but because it helps lớn resolve the confusion over USB 3.x naming and, for the most part, it gives users a predictable và consistent experience. The USB4 protocol requires a USB-C to lớn USB-C cable.

Up khổng lồ 40Gbps Data Transfer Rate: USB4 devices are required to support 20 Gbps (2.4 GB/sec). They can optionally support 40 Gbps (4.8 GB/sec) if they use the shorter 0.8 meter gene 3 cable.

Multiple Data and Display Protocols: USB4 supports USB 3.2, PCIe và DisplayPort 1.4a through a technique called protocol tunneling. DisplayPort & Thunderbolt 3 are also supported via alt Mode.

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Backward compatibility with USB 3.2, USB 2.0 và Thunderbolt 3: USB4 maintains compatibility with previous versions of the USB specification and, thanks to lớn its Thunderbolt 3 foundation, supports TB3 alternative text Mode too.

Video và Data Bandwidth Optimization: USB 3.2 allocated fixed bandwidth to data or video or, in DP alternative text Mode, gave 100% khổng lồ video. USB4 dynamically allocates bandwidth to clip and data based on actual needs.

100 Watt Charging: All USB4 devices tư vấn USB power nguồn Delivery. When a device is connected khổng lồ a USB4 port, USB PD negotiates a "contract" to lớn deliver power, safely supplying up to lớn 100 W (5A/20V).

What is Protocol Tunneling?When devices talk to one another, they bởi vì so using a protocol. If both devices can speak & understand the same protocol, a connection can be established. Conceptually, Protocol Tunneling creates a "pipe" with one protocol & uses it khổng lồ send data in another protocol. USB4 Protocol Tunneling creates a USB-C tunnel through which DisplayPort or PCIe data can be sent. USB4 Protocol Tunneling is similar to alternative text Mode but doesn"t require a DP or PCIe controller.

What is USB4 Fabric?The word fabric is a metaphor used lớn describe a network of interconnecting nodes, such as switches. When illustrated, the crisscross pattern resembles woven cloth. The term has been adopted by the USB Implementers diễn đàn (USB-IF) khổng lồ describe how USB4"s tunneling architecture dynamically manages the connection between USB4 routers so multiple protocols can simultaneously cốt truyện the fabric"s resources.

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Will Apple support USB4?Apple"s new MacBooks & Mac Mini will be the first khổng lồ use táo bị cắn Silicon"s own Arm-based processors, so there was some doubt surrounding tư vấn for USB4. However, apple was able to lớn implement tư vấn for both USB4 & Thunderbolt 3 in time for the product rollouts.


USB Standards

Your USB connections are about to become faster! Products compatible with the Thunderbolt™ 3 standard have entered the market. This latest generation offers both nguồn delivery và bidirectional data transfer at speeds up to 4x faster than USB 3.2 ren 2, and can create never-before-possible computing options for personal devices.


StandardAlso Known AsLogoYear IntroducedConnector TypesMax. Data Transfer SpeedCable Length**
USB 1.1Full speed USB1998USB-AUSB-B12 Mbps3 m
USB 2.0Hi-Speed USB
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2000USB-AUSB-BUSB Micro AUSB Micro BUSB Mini AUSB Mini BUSB-C*480 Mbps5 m
USB 3.2 gene 1USB 3.0USB 3.1 gen 1SuperSpeed
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2008 (USB 3.0)2013 (USB 3.1)USB-AUSB-BUSB Micro BUSB-C*5 Gbps3 m
USB 3.2 gene 2USB 3.1USB 3.1 ren 2SuperSpeed+SuperSpeed 10Gbps
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2013 (USB 3.1)USB-AUSB-BUSB Micro BUSB-C*10 Gbps3 m
USB 3.2 ren 2x2USB 3.2SuperSpeed 20Gbps
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2017 (USB 3.2)USB-C*20 Gbps3 m
USB 4USB4 gene 2×2USB4 20Gbps
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2019USB-C*20 Gbps0.8 m
USB 4USB4 ren 3×2USB4 40Gbps
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2019USB-C*40 Gbps0.8 m

* USB-C is more accurately known as Type C or USB Type C** Cable length is the length covered by the specification. Longer lengths can be achieved using active cables and in some cases, longer passive cables

Does USB-C support USB 2.0?It can but first let"s clarify the difference between USB-C and USB. USB-C is a physical connector and, despite the name, it does not imply support for any particular version of the USB standard. In fact, a USB-C connector can be used lớn connect peripherals using other interface standards such as Thunderbolt 3.

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When buying USB-C cables, make sure to kiểm tra the charging wattage and USB data rate supported. A charging cable supporting USB 2.0 can be longer than USB 3.x and USB4 cables but is limited khổng lồ a 480 Mbps data transfer rate và will not support alt-modes.