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UA
Unnumbered Acknowledgement
UBR
Unspecified Bit Rate - ATM
UDDI
Universal Description, Discovery and Integration
Provides data on the author, category, technical means used to request web services developed and published by companies.
UDLR
Unidirectional Link Routine
Network satellite link in a same Internet network
UDP
User Datagram Protocol - RFC 768 - see frame
An efficient but unreliable, connectionless protocol that is layered over IP, as is TCP. Application programs are needed to supplement the protocol to provide error processing and retransmission of data. UDP is an OSI layer 4 protocol
U-FRAME
Unnumbered frame
UI
Unnumbered Information
A logical link control - LLC - frame type on which LLC does not perform link-level error recovery.
UIO
Universal I/O serial port - Cisco ¨
U-LAW
Standard ar 64 K/bps codec in G.711 - Voice.
UNC
Universal Naming Convention
* up to max. 5 meters
* up 127 devices
* 12 M-bits/s
UNI
User Network Interface
Defined by the ATM forum for public and private ATM network access.
UONE
Unified Open Network Exchange - Cisco ¨
UPS
Uninterrupted Power Supply
URI
Uniform Resource Identifier - RFC 1630
URL
Uniform Resource Locators - RFC 1738
URN
Uniform Resource Name - RFC 1737
USART
Universal Synchronous Asynchronous Receiver / Transmitter
USOC
Universal Service Order Codes
UTF
Unicode Transformation Format
UTF-8 is an ASCII-preserving encoding method for Unicode - ISO 10646 - the Universal Character Set. The UCS encodes most of the world's writing systems in a single character set, allowing you to mix languages and scripts within a document without needing any tricks for switching character sets. This web page is encoded directly in UTF-8. Until now, most computer text has been recorded in single-byte 7-bit or 8-bit character sets (1), one per language or language group. For example, the default character set of the Web is ISO 8859-1 Latin Alphabet 1, which can encode English plus most West European languages: Italian, Spanish, German, Icelandic, etc. But it can't encode East European languages like Polish, Czech, or Hungarian, even though they use the same alphabet, because the accents are different. Nor can it represent languages like Russian, Arabic, Hebrew, or Japanese that use other writing systems. Therefore, to write in languages other than our own we often have to switch character sets, and as anybody who has tried it can tell you, that's a tricky business.
Each character is represented not by a single byte (1), but can be one, two, three, four, or more bytes, depending on the Unicode Transformation Format used and the specific characters involved.
UTP
Unshielded Twisted Pair
see cable
UTRA
UMTS Terrestrial Radio Access
The ETSI term for WCDMA
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