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TCP/IP |
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Transmission control protocol/Internet protocol. A
communications protocol developed under contract from the U.S. Department of
Defense to network dissimilar systems. Invented by Vinton Cerf and Bob Kahn,
this de facto Unix standard is the protocol of the Internet and has become the
global standard for communications.
TCP provides transport functions, which ensures that the total amount of
bytes sent is received correctly at the other end. UDP is an alternate transport
that does not guarantee delivery. It is widely used for real-time voice and
video transmissions where erroneous packets are not retransmitted.
IP provides the routing mechanism. TCP/IP is a routable protocol, which means
that all messages contain not only the address of the destination station, but
the address of a destination network. This allows TCP/IP messages to be sent to
multiple networks within an organization or around the world, hence its use in
the worldwide Internet. Every client and server in a TCP/IP network requires an
IP address, which is either permanently assigned or dynamically assigned at
startup. |
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TDD |
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Time Division Duplex. |
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TDMA |
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Time Division Multiple Access; air
interface for digital cell phones that interleaves data in time slots and
provides multiple access to a small number of wireless frequencies. It is a
component of GSM. |
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terminal |
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Device providing the user with user
agent capabilities; also, a mobile terminal or a mobile station. |
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TransFlash |
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Formerly
known as T-Flash, the TransFlash is currently
the world's smallest removable flash memory storage
format. |
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two-way paging |
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The ability to receive and send data to
the Internet by way of the paging network; also often called interactive
paging. |
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| U |
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UI |
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User interface. |
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UMTS |
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Universal Mobile Telecommunications
System; a new-generation technology for rapidly moving data and multimedia over
wireless devices.
The European implementation of the 3G wireless phone system, UMTS provides
service in the 2GHz band and offers global roaming and personalized features;
designed as an evolutionary system for GSM network operators, multimedia data
rates up to 2mbps are expected. |
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URL |
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Uniform resource locator; the address
that defines the route to a file on the Web or any other Internet facility. URLs
are typed into the browser to access Web pages, and URLs are embedded within the
pages themselves to provide the hypertext links to other pages.
The URL contains the protocol prefix, port number, domain name, subdirectory
names, and file name. Port addresses are generally defaults and are rarely
specified. To access a home page on a Web site, only the protocol and domain
name are required. |
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user |
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Person who interacts with the user agent
to view, hear, or use a resource. |
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UWC-136 |
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3G data rates for TDMA. |
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| W |
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W3C |
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World Wide Web Consortium; an
international industry consortium founded in 1994 to develop common standards
for the World Wide Web. It is hosted in the United States by the Laboratory for
Computer Science at M.I.T. |
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WAP |
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Wireless Application Protocol;
determines how wireless devices utilise internet content and other
services. |
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WAP gateway |
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Software that takes raw WML data and
compiles it for the microbrowser and vice versa. |
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WBMP |
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Wireless bitmap; image format used in
the Wireless Application Protocol. |
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WCDMA |
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Wideband CDMA; a 3G technology that
increases data transmission rates in GSM systems by using CDMA instead of TDMA.
WCDMA has become the Direct Sequence (DS) mode in the ITU's 3G specification,
which includes the 1X Multi-Carrier mode (1X MC) and 3X Multi-Carrier mode (3X
MC). 1X MC (formerly known as CDMA2000) and 3X MC comprise the 3G upgrade path
for carriers already using CDMA (CDMA One). |
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Web clipping |
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Extracting relevant information from a
Web page for display on a smart phone or a PDA. |
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Web server |
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Network host that acts as an HTTP
server; a computer that provides World Wide Web services on the Internet; it
includes the hardware, operating system, Web server software, TCP/IP protocols,
and the Web site content (Web pages). |
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Windows CE |
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A streamlined version of Windows from
Microsoft for handheld PCs (HPCs) and consumer electronics devices. It runs
Pocket versions of popular applications such as Microsoft Word and Excel as well
as many applications that are geared specifically for the smaller platform. As
of version 3.0, Windows CE was changed substantially and renamed Pocket
PC. |
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wireless modem |
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A modem and antenna that transmits and
receives over the air. Wireless modems come in several varieties, including
units for CDPD, ARDIS, Mobitex, Ricochet, 802.11, OpenAir, BellSouth Intelligent
Wireless Networks, and other proprietary products. |
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wireless
portal |
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A Web site that supports a user with a
smart phone or an alphanumeric pager. It may offer a variety of features,
including providing a springboard to other (WAP-based) wireless sites, the
ability to select content to be pushed to the user's device as well as providing
a point of entry for anyone to send the user a message. |
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WLAN |
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Wireless LAN; a local area network that
transmits over the air typically in an unlicensed frequency such as the 2.4GHz
band. A wireless LAN does not require lining up devices for line-of-sight
transmission like IrDA. Wireless access points (base stations) are connected to
an Ethernet hub or server and transmit a radio frequency over an area of several
hundred to a thousand feet and can penetrate walls and other nonmetal barriers.
Roaming users can be handed off from one access point to another like a cellular
phone system. Laptops use wireless modems that plug into an existing Ethernet
port or that are self contained on PC cards, while standalone desktops and
servers use plug-in cards (ISA, PCI, and so on). |
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WLIF |
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Wireless LAN Interoperability Forum; a
membership group that endorses products that are interoperable with major
standards; supports OpenAir and 802.11. |
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WML |
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Wireless Markup Language; a markup
language for devices using WAP. It is based on the Handheld Device Markup
Language (HDML); ordinary Web browsers cannot read WML. |
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WMLS
(WMLScript) |
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Wireless Markup Language Script; a
subset of JavaScript, used to program mobile devices. |
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WWW |
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World Wide Web. |
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| X |
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XML |
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Extensible Markup Language. An open standard for
describing data from the W3C. It is used for defining data elements on a Web
page and business-to-business documents. It uses a similar tag structure as
HTML; however, whereas HTML defines how elements are displayed, XML defines what
those elements contain. HTML uses predefined tags, but XML allows tags to be
defined by the developer of the page. Thus, virtually any data items, such as
product, sales rep, and amount due, can be identified, allowing Web pages to
function like database records. By providing a common method for identifying
data, XML supports business-to-business transactions and is expected to become
the dominant format for electronic data interchange. |
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