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Glossary
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TACS
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Total Access Communications System
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TATRC
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Telemedicine and Advanced Technology Research Centre
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TCP/IP
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Transmission Control Protocol / Internet Protocol
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TD-CDMA
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Time Division-Code Division Multiple Access
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TDMA
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Time Division Multiple Access, a technology for delivering digital wireless service using time-division multiplexing (TDM). TDMA works by dividing a radio frequency into time slots and then allocating slots to multiple calls. In this way, a single frequency can support multiple, simultaneous data channels. TDMA is used by the GSM digital cellular system. TDMA is a competing technology to CDMA. The combined indirect and direct costs of owning a piece of hardware or software.
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TD-SCDMA
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Time Division-Synchronous Code Division Multiple Access
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Three-tier
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A three-way interaction in a client/server environment, in which the user interface is stored in the client, the bulk of the business application logic is stored in one or more servers, and the data are stored in a database server.
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TIA
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Telecommunications Industry Association
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tier 1
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The top level of something. A Tier 1 city is one of the major metropolitan areas in a country. A Tier 1 vendor is one of the largest and most well-known in its field. However, the term can sometimes refer to the bottom level or first floor. For example, the U.S. government labels Tier 1 Y2K compliance as the bottom level.
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TLD
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Top Level Domain
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TLS
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Transport Layer Security
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Transaction
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Electronic transactions can be subdivided into several steps, each of which initiates a process. There are pre-sale (or -purchase) phases, sale and after-sale phases. Typically a transaction starts with information gathering, price and quality comparisons and possibly pre-sale negotiations. During the sale phase contracting and delivery are the core processes, and payment is the final stage of this phase. After-purchase transaction stages comprise customer service, the administration of credit payments and the handling of returns as well as marketing activities preparing for the next purchase.
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TRX
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Transceiver (in GSM). A network component that can serve full duplex communication on eight full-rate traffic channels.
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TV
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Television
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UHF
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Ultra High Frequency
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UK
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United Kingdom
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UMTS
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Universal Mobile Telecommunications System. Technology for 3G mobile services (next generation of GSM (Global System of Mobile communications)). In addition to voice and video telephony services, UMTS supports data transfer rates up to 144 Kbit/s in rural environment and 2 Mbit/s in indoor environment. It is also the European implementation of the ITU-R-defined family of IMT2000 standards based on Wideband Code Division Multiple Access (WCDMA) technology.
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USA
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United States of America
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USD
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United States Dollar
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USIM
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UMTS SIM (Universal SIM)
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USSD
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Unstructured Supplementary Service Data
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UTRA FDD
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UMTS Terrestrial Radio Access Frequency Division Duplex
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UTRA TDD
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UMTS Terrestrial Radio Access Time Division Duplex
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UTRAN
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UMTS Terrestrial Radio Access Network
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