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| G |
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Globalstar |
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Second major LEO-based global communications system;
initially created for voice, it was launched in late 1999. |
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GPRS |
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General Packet Radio Service allows
packet rather than circuit switch connections on cellular networks. This allows
high-speed mobile access and the ability to connect only to the mobile network
when Internet access is required. |
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GPS |
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Global Positioning System. A system of
24 satellites for identifying earth locations, launched by the U.S. Department
of Defense. By triangulation of signals from three of the satellites, a
receiving unit can pinpoint its current location anywhere on earth to within a
few meters. |
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GSM |
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Global System for Mobile Communications.
Digital cell phone system used throughout Europe based on TDMA; introduced SIM
card and short messaging (SMS); GSM has a maximum data transfer rate of
9.6kbps. |
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| H |
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HDML |
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Handheld Device Markup Language;
forerunner of WML. |
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HLR |
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Home Location Register. |
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HomeRF |
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Wireless personal area network (PAN)
from HomeRF Working Group; uses 2.4GHz band at 1mbps or 2mbps within 150-foot
range. |
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HTML |
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HyperText Markup Language |
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HTML 1.0 |
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i-Mode-compatible HTML that supports all
iMode terminals. |
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HTML 2.0 |
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i-Mode-compatible HTML that supports
only the NTTDoCoMo 502i series terminals. |
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HTTP |
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HyperText Transfer Protocol |
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| I |
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iDEN |
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Integrated Digital Enhanced Network;
wireless system from Motorola that integrates voice, data, short messages, and
dispatch radio; used by Nextel and others. |
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i-Mode |
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Packet-based information service for
mobile phones from NTT DoCoMo (Japan); first to provide Web browsing from cell
phones. |
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IMT 2000 |
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International Mobile Telecommunications
2000; 3G wireless from the ITU; also known as third-generation mobile
systems. |
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IP |
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Internet Protocol; the IP part of
the TCP/IP communications protocol. IP implements the network layer
(layer 3) of the protocol, which contains a network address and is used to route
a message to a different network or subnetwork. IP accepts "packets" from the
layer 4 transport protocol (TCP or UDP), adds its own header to it, and delivers
a "datagram" to the layer 2 data link protocol. It may also break the packet
into fragments to support the maximum transmission unit (MTU) of the
network. |
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IrDA |
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Infrared Data Association; based in
Walnut Creek, California, a membership organization founded in 1993 and
dedicated to developing standards for wireless, infrared transmission systems
between computers. With IrDA ports, a laptop or PDA can exchange data with a
desktop computer or use a printer without a cable connection. Like a TV remote
control, IrDA requires line-of-sight transmission. IrDA products began to appear
in 1995. The LaserJet 5P was one of the first printers with a built-in IrDA
port.
IrDA is comprised of the IrDA Serial IR physical layer (IrDA-SIR), which
provides a half-duplex connection of up to 115.2kbps. This speed allows the use
of a low-cost UART chip; however, higher non-UART extensions for 1.15mbps and
4mbps have also been defined. IrDA uses the Infrared Link Access Protocol
(IrLAP), an adaptation of HDLC, as its data link protocol. The Infrared Link
Management Protocol (IrLMP) is also used to provide a mechanism for handshaking
and multiplexing of two or more different data streams
simultaneously. |
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IrDA port |
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A transmitter/receiver for infrared
signals. |
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Iridium |
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First LEO-based global communications
system backed by Motorola. Built primarily for voice transmissions, it was
launched in 1998 and went into Chapter 11 in 1999. |
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ISDN |
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Integrated Services Digital
Network. |
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IVR |
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Interactive Voice Response. |
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| J |
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Java |
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An object-oriented programming language developed by Sun
Microsystems that creates applications that work on multiple operating
systems. |
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JavaScript |
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Programming language used to add dynamic
behavior to HTML documents. |
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JINI |
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Based on Java, this is a Sun system for
easily connecting any type of devices, including a Net device, to a
network. |
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| L |
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LCD |
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Liquid-crystal display, such as the screen found on an
i-Mode cellular phone used for reading e-mails and accessing the
Internet. |
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LMP |
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Link Manager Protocol; responsible for
link setup between Bluetooth devices, including security issues and controlling
power modes of the Bluetooth Radio device. |
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| M |
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MDS |
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Multipoint Distribution Service; licensed spectrum in
the 2.1GHz band. |
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microbrowser |
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A Web browser specialized for a smart
phone or a PDA and optimized to run in the low-memory and small-screen
environment of a handheld device. |
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MiniSD |
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A variant of flash
memory card designed for mobile phone market. |
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MMC |
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MultiMediaCard;
a flash memory card for portable devices. |
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MMDS |
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Multipoint Multichannel Distibution
Service; licensed spectrum in the 2.5GHz to 2.6GHz band; range is 30 miles or
more. |
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MMM |
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Mobile Media Mode is an icon that
identifies Web content optimized for smart phones and handhelds. |
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| N |
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NAP |
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Network Access Point. |
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Nextel |
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Nationwide wireless operator that
acquired numerous SMR companies. |
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NTT DoCoMo |
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Wireless division of Nippon Telegraph
and Telephone; a Japanese cellular provider and chief developer of
i-Mode. |
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| O |
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OpenAir |
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Wireless LAN standard from WLIF; based
on Proxim's RangeLAN2 products. |
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