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The functionality of a USB device is defined by a class code sent to a USB host. This allows the host to load software modules for the device and to support new devices from different manufacturers. a b c "Universal Serial Bus 3.1 Specification" (ZIP). USB Implementers Forum . Retrieved 27 April 2023. Starting with the USB 3.2 specification, USB-IF introduced a new naming scheme. [37] To help companies with branding of the different operation modes, USB-IF recommended branding the 5, 10, and 20Gbit/s operation modes as SuperSpeed USB 5Gbps, SuperSpeed USB 10Gbps, and SuperSpeed USB 20Gbps, respectively. [38]. UART and RS-232 serial adapter, modem, Wi-Fi adapter, Ethernet adapter. Used together with class 0Ah (CDC-Data) below
The USB3.0 Powered-B connector has two additional pins for power and ground supplied to the device. [54] USB Device Class Specifications". www.usb.org. Archived from the original on 13 August 2014 . Retrieved 4 May 2018. The design is intended to make it 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. [30] The USB-C plug however is reversible. 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.Many USB bridge / data transfer cables are still USB 2.0, but there are also a number of USB 3.0 transfer cables. Despite USB 3.0 being 10 times faster than USB 2.0, USB 3.0 transfer cables are only 2 - 3 times faster given their design. [ clarification needed]
Neither USB 1.0 nor 1.1 specified a design for any connector smaller than the standard type A or type B. Though many designs for a miniaturized type B connector appeared on many peripherals, conformity to the USB1. x standard was hampered by treating peripherals that had miniature connectors as though they had a tethered connection (that is: no plug or receptacle at the peripheral end). There was no known miniature type A connector until USB2.0 (revision 1.01) introduced one. Various protocol converters are available that convert USB data signals to and from other communications standards. USB 2.0 Specification". USB Implementers Forum. Archived from the original on 3 December 2017 . Retrieved 28 April 2019. The USB Micro also has 5 pins similar to that of the USB Mini, where the additional pin supports OTG connectivity. The table below shows the pinout of Micro-A and B. Pin
USB 1.0 and 1.1
Battery Charging Specification 1.1 Added support for dedicated chargers, host chargers behavior for devices with dead batteries The eSATA connector is a more robust SATA connector, intended for connection to external hard drives and SSDs. eSATA's transfer rate (up to 6Gbit/s) is similar to that of USB3.0 (up to 5Gbit/s) and USB3.1 (up to 10Gbit/s). A device connected by eSATA appears as an ordinary SATA device, giving both full performance and full compatibility associated with internal drives. SuperSpeed+ (SS+) uses a new coding scheme with an increased signaling rate (Gen 2×1 mode) and/or the additional lane of USB-C (Gen 1×2 and Gen 2×2 modes).
Two-lane operation (USB3.2 Gen1x2, USB3.2 Gen2x2) is only possible with Full-Featured USB-C Fabrics. [71] USB 3.2 specification operation modes
USB 4.0
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. [110] Ethernet [ edit ] The Linux kernel mainline contains support for USB3.0 since version 2.6.31, which was released in September 2009. [27] [28] [29]
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