Universal Serial Bus

(redirected from USB 2)

universal serial bus

[‚yü·nə‚vər·səl ‚sir·ē·əl ′bəs]
(computer science)
A serial interface that can transfer data at up to 480 million bits per second and connect up to 127 daisy-chained peripheral devices. Abbreviated USB.

Universal Serial Bus

(hardware, standard)
(USB) An external peripheral interface standard for communication between a computer and external peripherals over an inexpensive cable using biserial transmission.

USB is intended to replace existing serial ports, parallel ports, keyboard, and monitor connectors and be used with keyboards, mice, monitors, printers, and possibly some low-speed scanners and removable hard drives. For faster devices existing IDE, SCSI, or emerging FC-AL or FireWire interfaces can be used.

USB works at 12 Mbps with specific consideration for low cost peripherals. It supports up to 127 devices and both isochronous and asynchronous data transfers. Cables can be up to five metres long and it includes built-in power distribution for low power devices. It supports daisy chaining through a tiered star multidrop topology. A USB cable has a rectangular "Type A" plug at the computer end and a square "Type B" plug at the peripheral end.

Before March 1996 Intel started to integrate the necessary logic into PC chip sets and encourage other manufacturers to do likewise. It was widely available by 1997. Later versions of Windows 95 included support for it. It was standard on Macintosh computers in 1999.

The USB 2.0 specification was released in 2000 to allow USB to compete with Firewire etc. USB 2.0 is backward compatible with USB 1.1 but works at 480 Mbps.

References in periodicals archive ?
USB Type-C is a hardware change, rather than an interface standard change (like USB 2.0 to USB 3.0).
USB 2.0 was released in 2000 and ratified more than a year later, speeding up to 480 Mbit/s.
The Alldaq USB 3.0 isolators are compatible with Windows, MAC OS and Linux systems, and downward-compatible with USB 2.0/1.1/1.0 equipment.
The SanDisk Cruzer Blade pen drive features a USB 2.0 interface and has a capacity of 16GB.
Among those are the Usbkingdom 32GB USB 2.0 doctor-shaped flash drive, the MEEKO 16GB USB 2.0 motorcycle-shaped flash drive, the WooTeck 32GB USB metal wrench flash drive, and the AreTop 32GB USB lifelike flash drive, also all under $15 each.
That means a USB Type-C connector can either be USB 2.0 capable of 480Mbps, USB 3.
Microsoft's patent says that the connector would only be able to support USB 2.0 speeds, which is only up to 60MBps. This could render the USB-C port a bit useless since most Type-C connectors are using USB 3.0 (5gbps) and USB 3.1 (10gbps) speeds.
Included inside the box is the drive, a USB-C to USB-C cable, a USB- C to USB-A cable, and compatibility with computers featuring a ThunderboltTM 3, USB 3.1 Gen 1, USB 3.0 or USB 2.0 interface.
* USB 2.0 high-speed (480 Mbps) syncing of multiple device types--irrespective of manufacturer.
Because Type-C cables are more powerful than USB 2.0/3.0, there is greater danger in acquiring the wrong cable for devices.
today announced it has reduced the power and area of its DesignWare USB 2.0 Type-C Controller and PHY IP for cost-sensitive and energy-efficient Internet of Things (IoT) edge applications targeting 40-nanometer (nm) and 55-nm ultra-low power processes.
But if you plug it into your old desktop PC with a USB 2.0 port, it'll run at half speed and your backups will take longer.