Pronounced u-art, and short for universal asynchronous receiver-transmitter, the UART is a computer component that handles asynchronous serial communication. Every computer contains a UART to manage the serial ports, and some internal modems have their own UART.
As modems have become increasingly fast, the UART has come under greater scrutiny as the cause of transmission bottlenecks. If you are purchasing a fast external modem, make sure that the computer’s UART can handle the modem’s maximum transmission rate. The newer 16550 UART contains a 16-byte buffer, enabling it to support higher transmission rates than the older 8250 UART.
Short for user-agent server. In VoIP, a server application in an SIP system that accepts the requests from a UAC and generates an accept, reject or redirect response on behalf of the user. The combination of the UAC and the UAS is called the SIP user agent. The SIP user agent allows peer-to-peer calls to […]
- User Acceptance Testing (UAT)
Short for user acceptance testing, typically the final phase in a software development process in which the software is given to the intended audience to be tested for functionality. UAT is either done by making the software available for a free trial, typically over the Internet, or by using an in-house testing panel comprised of […]
Short for Ultimate Bulletin Board, it is a popular Web based bulletin board system (a type of Internet-based discussion forum). Internet users who post and use forums based on UBB often see the message “You may use UBB code in your post”. UBB code is a simple variation on the common HTML tags that allow […]
Short for unsolicited bulk e-mail (spam).
Short for unspecified bit rate, or Class D quality of service, an ATM bandwidth-allocation service that does not guarantee any throughput levels and uses only available bandwidth. UBR is often used when transmitting data that can tolerate delays. Compare with ABR, CBR and VBR.