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U

Word Explanation
U.S. Robotics, Inc.

(USR). A modem manufacturer in Skokie, Illinois.

U/L

Upload. To send a data transmission.

U2F

Undetectable and Untraceable Fraud. A major issue for information technology is fraud made possible by technology and electronic transactions, especially crimes that leave no trace and no audit trail.

u3b

Top-level newsgroup category for an AT&T 3B computer newsgroup.

UA

User Agent. An OSI application process that can represent a human user or an organization to the X.400 Message Handling System. The user agent creates, sends, and receives messages for the user.

UART

Universal Asynchronous Receiver Transmitter. An integrated circuit which is used for transmitting and receiving data asynchronously via the serial port on the computer. It contains a parallel-to-serial converter for data transmitted from the computer and a serial-to-parallel converter for data coming in via the serial line. The UART also has a buffer for temporarily storing data from high-speed transmissions. See universal receiver transmitter.

UBE

Unsolicited Bulk Email. Unsolicited bulk email , or spam, is an attempt by a company to get others to pay for its advertising. The costs of this kind of email are paid not by the company but by the Internet service provider and ultimately by the end user. Spam is seldom used by reputable companies. Most bulk email consists of chain letters, pyramid schemes, MMF ("make money fast") schemes, advertisements for pornographic sites, offers of software for collecting email addresses and sending unsolicited commercial email, stock offers for unknown startup companies, etc.

UBR

(Unspecified Bit Rate). Asynchronous transfer mode (ATM) service in which available bandwidth is not guaranteed.

UCD: Uplink Channel Descriptor

Uplink Channel Descriptor (UCD) is a concept in the IEEE 802.16 (WiMAX) network, which describes the uplink burst profile (i.e., modulation and coding combination) and preamble length for each UL burst.

UCS

Universal Character Set. A character set using 16-bit character codes, also called ISO 10646. UCS is a standard defined by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), and allows 65,536 (or 256 x 256) characters instead of the 256 available in ASCII. If a printer has the UCS feature, it can use a larger range of characters. The 8-bit character sets ASCII and ISO Latin 1 are subsets within UCS.

udb

Universal Debugger. An interactive source level debugger from Kendall Square Research (KSR), used for testing and debugging serial and parallel programs written in KSR, Fortran, and some other languages.

UDDI

UDDI (Universal Description, Discovery, and Integration) is an XML-based registry for businesses worldwide to list themselves on the Internet. Its ultimate goal is to streamline online transactions by enabling companies to find one another on the Web and make their systems interoperable for e-commerce. While the group does not refer to itself as a standards body, it does offer a framework for Web services integration. UDDI is often compared to a telephone book's white, yellow, and green pages. The project allows businesses to list themselves by name, product, location, or the Web services they offer.

UDF

Universal Disk Format. The volume format of DVD disks.

UDLP: UniDirectional Link Protocol

UniDirectional Link Protocol (UDLP) is used by inexpensive, receive-only antennas to receive data via satellite.

UDMA

Ultra DMA (Ultra Direct Memory Access). A protocol developed by Quantum Corporation and Intel for disk drives that enables the computer to take advantage of the fast Ultra ATA disk drives. UDMA/33 is twice as fast as the previous disk drive standard for PCs, supporting burst mode data transfer rates of 33.3 MBps. A further improvement is UDMA/66. See DMA.

UDP

User Datagram Protocol. A communications protocol for the Internet network layer, transport layer, and session layer, which makes it possible to send a datagram message from one computer to an application running in another computer. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol). Unlike TCP, UDP is connectionless and does not guarantee reliable communication; the application itself must process any errors and check for reliable delivery.

UE: User Equipment

User Equipment (UE) refers to eqiment in a wireless network that enables users to communicate through wireless communication networks.

uemacs

MicroEmacs. A simple text editor which has versions for most personal computers and for many other computers. It is abbreviated this way because "u" looks like the Greek letter micro.

UGS: Unsolicited Grant Service

Unsolicited Grant Service (UGS) is one of the five QoS service types defined in the IEEE 802.16 WiMAX. The 802.16 protocol supports five types of QoS -- UGS (Unsolicited grant service), rtPS (Real time polling Service), ertPS (Extended Real-time POLLING SERVICE), nrtPS (Non-real-time polling service and BE (Best effort service). The Unsolicited Grant Service (UGS) is designed to support real-time service flows that generate fixed-size data packets on a periodic basis, such as T1/E1 and Voice over IP without silence suppression. The service offers fixed-size grants on a real-time periodic basis, which eliminate the overhead and latency of SS requests and assure that grants are available to meet the flow’s real-time needs.

UHF

Ultra High Frequency. Electromagnetic frequencies in the range of 300 to 3000 megaherz. Used for some television and radio transmission.

UHF: Ultra High Frenquency

Ultra High Frenquency (UHF) refers to the RF spectrum between 300 MHz and 3 GHz.

UI
  1. Unix International. An association that promoted an open computing environment based on UNIX System V. It disbanded in 1993 when Novell bought UNIX. 2. user interface. The combination of hardware and software that makes it possible for a user to interact with a computer or other device.
UICC: USIM Integrated Circuit Card

USIM Integrated Circuit Card (UICC) is the chip card used in mobile terminals in 3G telecom network systems. The UICC is an essential component for UMTS, just as the SIM for GSM. Extending the concept of the SIM card, the UICC contains the USIM application and also provides a platform for other IC Card applications. It ensures the integrity and security of all kinds of personal data, enabling secure support for all kinds of multi-application schemes.

UIM: User Identity Module

User Identity Module (UIM), also known as R-UIM, is the SIM card equivalent planned for W-CDMA handsets. UIM supports roaming between CDMA and GSM networks.

UIMX

User Interface Management System for X Windows. Interface design software from Visual Edge Software, Ltd., for Motif and Open Look.

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