USB (Universal Serial Bus) is designed for peripherals.
USB is represented by a serial interface of data transfer for medium-speed and low-speed peripherals.
USB cable is represented by two twisted-pair cables: one twisted-pair cable serves for data transfer in both directions (differential connection), the other one is used for power supply of the peripheral (+5 B). Owing to the built-in supply lines, providing current up to 500 mA, USB often allows to use the device without its own power supply unit (provided that this device consumes current not more than 500 mA).
Up to 127 devices can be connected to one USB through a chain of hubs (they use the tiered star topology).
Unlike many other standard connector types, USB is characterized by durability and mechanical strength.
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