Glossaries: U

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UART

Universal Asynchronous Receiver/Transmitter.


UBI

Usage-Based Insurance.


Ubiquitous Computing

The concept of embedding microprocessors in everyday things so they can communicate information continuously. Ubiquitous devices are expected to be constantly connected. Utility smart meters are an example of ubiquitous computing, replacing manual meter-readers with devices that can report usage and modify power settings on ubiquitous appliances.


Ultra-Wide Band

A “spark gap” transmitter that emits a very weak, very wide (in frequency) pulse of RF energy. This signal is used mostly for localizing signals. Wide signal bandwidths are good for measuring distance.


UMTS

Universal Mobile Telecommunications System.


Uniform Resource Identifier (URI)

The unique identifier that makes content addressable on the Internet by uniquely targeting items, such as text, video, images, and applications.


Uniform Resource Locator (URL)

A particular type of URI that targets web pages so that when a browser requests them, they can be found and served to users.


Universal Asynchronous Receiver/Transmitter (UART)

A microchip controlling a computer’s interface to serial devices, converting the bytes it receives from the computer along parallel circuits into a single serial bit stream. A 16550 UART has a 16-byte buffer.


Universal Authentication

A network identity-verification method that allows users to move from site to site securely without having to enter identifying information multiple times.


Universal Mobile Telecommunications System (UMTS)

Also referred to as 3G cellular technology, this is the third iteration of the GSM. It achieves improved data transfer speeds over 2G by adding additional higher frequency bands (2100MHz).