ActiveXperts SMS Messaging Server


NOTE (1): ActiveXperts SMS Messaging Server is an SMS messaging framework to allow sending, receiving and processing SMS messages. It is designed to implement any project that requires SMS messaging. Read more »

NOTE (2): ActiveXperts SMS Component provides developers with a fast and reliable SMPP API. Simply connect to the SMPP provider, bind using your credentials and call SubmitSms to send out the messages. Read more »



1.5-Way Paging
  Refers to guaranteed message receipt or advanced messaging, ensuring subscribers receive messages sent when they're out of range, but users cannot send text pages. Two-way paging allows users to send and receive.

1.7-Way Paging
  A paging service that offers more than guaranteed messaging but not as much as full two-way paging. The subscriber has limited response messaging, such as canned messages, rather than the ability to create responses.

  First generation of mobile wireless that utilizes analog air interface technology.

  Interim step building up to 3G involving overlay of higher-capacity data transmission capability to existing 2G digital wireless networks.

  Second generation of mobile wireless, which utilizes various digital protocols, including GSM, CDMA, TDMA, iDEN, and PDC.

  The nationwide number to reach the telecommunications relay service (TRS). TRS enables telephone conversations between people with speech or hearing disabilities and people without speech or hearing disabilities.

  IEEE standards for wireless LANs with specs for 1mbps, 2mbps, 11mbps, and 24mbps.

A and B PCS Blocks
  The first two PCS licenses that were auctioned by the FCC in March 1995. Each contains 30 MHz of spectrum in the 1900 MHz band and is based on MTA geographic partitions.

A Block
  In early 1981, the FCC announced that it would approve two licenses in each wireless market: a non-wireline company (which became known as the "A" side carrier), and a wireline company (the "B" side carrier).

A/B Switch
  A feature found on cellular telephones permitting the user (when roaming away from home) to select either the "A" (non-wireline) carrier or the "B" (wireline) carrier.

Access Fee
  A special fee that local telephone companies are allowed to charge all telephone customers for the right to connect with the local phone network. Cellular subscribers pay this fee along with a 3 percent federal telephone excise tax.

Access Line
  A telephone line reaching from the telephone company central office to a point on a private premise. Usually equates to one customer line.

Adjacent Channel Interference
  Signal impairment to one frequency due to presence of another signal on a nearby frequency.

Advanced Intelligent Network
  A system that allows a wireless user to make and receive phone calls while roaming in areas outside the user's "home" network. AINs enable service providers to define, test and introduce new multimedia messaging, PCS and cell routing.

Advanced Mobile Phone Service
  An analog cellular radio standard that serves as the foundation for the U.S. cellular industry. AMPS represents the first generation of wireless networks.

  Companies that assist carriers with building a wireless network. The affiliate may use the primary carrier's brand name, network operations, customer service or other facilities.

Air Interface
  The standard operating system of a wireless network. Technologies include AMPS, TDMA, CDMA and GSM.

  Actual time spent talking on the cellular telephone. Most carriers bill customers based on how many minutes of airtime they use each month. Airtime charges during peak periods of the day vary from about 20 cents to more than 40 cents per minute, depending on the service plan selected. Most carriers offer reduced rates for off-peak usage.

  A secret number issued to a cellular phone that is used in conjunction with a subscriber's shared secret data information for authentication.

  A message or other type of readout containing both letters ("alphas") and numbers ("numerics"). In cellular, "alphanumeric memory dial" is a special type of dial-from-memory option that displays both the name of the individual and that individual's phone number on the cellular phone handset. The name also can be recalled by using the letters on the phone keypad.
By contrast, standard memory dial recalls numbers from number-only locations.

American Mobile Telecommunications Association
  A Washington, D.C.-based trade group representing specialized mobile radio operators.

American National Standards Institute
  A private, non-profit organization that oversees the U.S. voluntary standardization and conformity assessment system. The Institute's mission is to enhance both the global competitiveness of U.S. business and the U.S. quality of life by promoting and facilitating voluntary consensus standards and conformity assessment systems, and safeguarding their integrity.

  A signaling method that uses continuous changes in the amplitude or frequency of a radio transmission to convey information. It relies on a continuous (rather than pulsed as in digital) electrical signal that varies in amplitude or frequency in response to changes of sound, light, position, etc., impressed on a transducer in the sending device; opposite of digital.

  A wire or set of wires used to send and receive radio waves.

Application Program Interface
  A language and message format used by an application program to communicate with the operating system or some other system or control program such as a database management system (DBMS) or communications protocol. APIs are implemented by writing function calls in the program, which provide the linkage to the required subroutine for execution. Thus, an API implies that a program module is available in the computer to perform the operation or that it must be linked into the existing program to perform the tasks.

Application Service Provider
  An organization that hosts software applications on its own servers within its own facilities. Customers access the application via private lines or the Internet. ASP is also called a "commercial service provider."

Application-Specific Integrated Circuit
  An integrated circuit tailored for a particular piece of electronic equipment.

Association of Public-Safety Communications Officials-International
  Trade group headquartered in South Daytona, Fla., representing law enforcement, fire, emergency services and other public-safety agency dispatchers and communications employees.

  The loss of signal energy due to absorption, reflection, or diffusion during transmission.

  The verification process to assure that a wireless device and its user are compatible with and authorized to access a wireless network. This process is accomplished through transmission of identifying data at the time of connection. Used for fraud prevention.

Automatic Vehicle Location
  Combining a location-sensing device (such as a GPS receiver) with a wireless communications link to provide a home office or dispatcher with the location of a vehicle or mobile asset (such as a trailer or heavy machinery).

Average Revenue Per Unit
  Measures the average monthly revenue generated for each customer unit, such as a cellular phone or pager, that a carrier has in operation.

B Block
  In early 1981, the FCC announced that it would approve two licenses in each market- a non-wireline company (which became known as the "A" side carrier), and a wireline company (the "B" side carrier).

B Carrier
  Most areas of the US have two cellular carriers, each of which operates on a different frequency band. One is designated the "A" carrier and the other is designated the "B" carrier. In some markets there may be only one carrier which may be "A" or "B".

  The capacity of a telecom line to carry signals. A greater bandwidth indicates the ability to transmit a greater amount of data over a given period of time.

Base Station
  The central radio transmitter/receiver that maintains communications with mobile radiotelephone sets within a given range (typically a cell site).

Base Station Controller
  The part of the wireless system's infrastructure that controls one or multiple cell sites' radio signals, thus reducing the load on the switch. Performs radio signal management functions for base transceiver stations, managing functions such as frequency assignment and handoff.

Base Transceiver Station
  The name for the antenna and radio equipment necessary to provide wireless service in an area. Also called a base station or cell site.

Basic Trading Area
  A geographic region defined by a group of counties that surround a city, which is the area's basic trading center. The boundaries of each BTA were formulated by Rand McNally & Co. and are used by the FCC determine service areas for PCS wireless licenses. The entire US and some of its territories is divided into 493 non-overlapping BTAs.

Bent Pipe Technology
  Satellite technology to transmit calls from one point on Earth to a satellite and back down to another point.

  Low-earth orbit satellite systems that will offer voice and data services, including Iridium and Globalstar.

  Wireless personal area network (PAN) standard that enables data connections between electronic devices such as desktop computers, wireless phones, electronic organizers and printers in the 2.4 GHz range at 720kbps within a 30-foot range. Bluetooth depends on mobile devices equipped with a chip for sending and receiving information.

  Describes a communications medium capable of transmitting a relatively large amount of data over a given period of time. A descriptive term for evolving digital technologies that offers integrated access to voice, high-speed data service, video-demand services, and interactive delivery services.

Broadband PCS
  Personal communications services created in the A- through F-Block auctions and used for voice and data. Broadband PCS is allocated 140 MHz of spectrum with 20 MHz currently unassigned. Frequency blocks A, B, and C were each assigned 30 MHz of spectrum, while frequency blocks D, E, and F were each assigned 10 MHz of spectrum.

  Grouping various telecommunications services -- wireline and/or wireless -- as a package to increase the appeal to potential customers and reduce advertising, marketing and other expenses associated with delivering multiple
services. For example, a bundled package could include long distance, cellular, Internet and paging services.

C Block
  The third PCS license that was auctioned by the FCC in May 1996. Each contains 30 MHz of spectrum in the 1900 MHz band and is based on BTA geographic partitions. The licenses were reserved for small businesses and entrepreneurs.

Call Barring
  Enables you to restrict or bar certain or all types of calls to and from your mobile phone, i.e. outgoing calls, outgoing international calls, incoming calls. Barring is activated with a personal code.

Call Divert
  Enables you to divert incoming calls to another phone or answering service.

Call Hold
  Enables you to put a caller on hold while a second call is answered or made.

Call Restriction
  Enables you to restrict or bar certain or all types of calls to and from your mobile phone, i.e. outgoing calls, outgoing international calls, incoming calls.

Call Transfer
  Enables you to transfer a caller to another number.

Call Waiting
  If your line is busy, callers are asked to wait while you are alerted to their incoming call.

Caller ID
  An enhanced feature that displays a caller's phone number on the wireless handset receiving the call. Many systems are adding the caller's name to the caller ID.

Calling Plan
  A rate plan selected by subscribers when they start up cellular service, usually consisting of a base rate for system access and a per-minute rate for usage. Service plans are designed to provide the most cost-effective rates for different types and amounts of usage by the cellular subscriber.

Cap Code
  A pager's unique electronic identification number.

  A 3G technology that is an evolutionary outgrowth of cdmaOne. It offers operators who have deployed a 2G cdmaOne system a seamless migration path to 3G. cdma2000 supports the 2G network aspect of all existing operators regardless of technology (cdmaOne IS-136 TDMA, or GSM). This standard is also known by its ITU name IMT-CDMA Multi-Carrier (1X/3X). cdma2000 has been divided into 2 phases. The first phase capabilities are defined in a standard known as 1X, which introduces 144 kbps packet data in a mobile environment and speeds beyond this in a fixed environment. cdma2000 phase two, known as 3X, incorporates the capabilities of 1X. It also supports all channel sizes (5 MHz, 10 MHz, etc.), provides circuit and packet data rates up to 2 Mbps, incorporates advance multimedia capabilities, and includes a framework for advanced 3G voice services and vocoders, including voice over packet and circuit data.

  The name used by the CDMA Development Group (CDG) for CDMA networks (IS-95) using 2nd-generation digital technology.

  The basic geographic unit of a cellular system. Also, the basis for the generic industry term: "cellular." A city or county is divided into smaller "cells," each of which is equipped with a low-powered radio transmitter/receiver. The cells can vary in size depending upon terrain, capacity demands, etc. By controlling the transmission power, the radio frequencies assigned to one cell can be limited to the boundaries of that cell. When a wireless phone moves from one cell toward another, a computer at the Mobile Telephone Switching Office (MTSO) monitors the movement and at the proper time, transfers or hands off the phone call to the new cell and another radio frequency. The handoff is performed so quickly that it is not noticeable to the callers.

Cell Phone
  A wireless telephone that sends and receives messages using radiofrequency energy in the 800-900 megahertz portion of the radiofrequency (RF) spectrum.

Cell Site
  The location where the wireless antenna and network communications equipment is placed. A cell site consists of a transmitter/receiver, antenna tower, transmission radios and radio controllers. A cell site is operated by a Wireless Service Provider (WSP).

Cell Splitting
  The process of creating more coverage and capacity in a wireless system by having more than one cell site cover a particular amount of geography. Each cell site covers a smaller area, with lower power MHz and thus offers the ability to reuse frequencies more times in a larger geographic coverage area, such as a city or MTA.

  A wireless telephone network that connects radio frequencies from a mobile phone to a system of multiple cell sites, each consisting of an antenna and a base station, to a mobile telephone switching office, and ultimately to the public wireline telephone system. Called 'cellular' because the system uses many base stations to divide a service area into multiple 'cells'. Cellular calls are transferred from base station to base station as a user travels from cell to cell.

Cellular Base Station
  The transmission and reception equipment, including the base station antenna, which connects a cellular phone to the network. Also called a cell site.

Cellular Digital Packet Data
  An enhanced packet overlay on analog cell phone networks used to transmit and receive data. This technology allows data files to be broken into a number of packets and sent along idle channels of existing cellular voice networks. CDPD provides 19.2 Kbps and is deployed by AT&T among several other carriers.

Cellular Telecommunications and Internet Association
  A trade group representing cellular, PCS and enhanced specialized mobile radio carriers. Customer Proprietary Network Information (CPNI): The carrier's data about a specific customer's service and usage. The FCC governs the usage of CPNI. Generally, information about a customer's account is considered proprietary until the customer authorizes its use.

  An electrical, electromagnetic, or optical path for communication between two points.

  In any industry, a measure of the number of customers who leave or switch to another service provider, usually stated as a percentage.

Circuit Switch Data
  Allows a user to use their wireless handset as a modem for laptops, PDAs and other electronic devices via infrared ports or designated data cables. CSD also allows a user to access Wireless Internet via their wireless handset (handset must be WAP compatible).

  A program of the CTIA Foundation providing wireless phones to schools for teacher use and student Internet access.

  A wireless phone programmed with stolen or duplicated electronic serial and mobile identification numbers. The Wireless Telephone Protection Act of 1998 outlawed cloning. The Act prohibits knowingly using, producing, trafficking in, having control or custody of, or possessing hardware or software knowing that it has been configured to insert or modify telecommunication identifying information associated with or contained in a telecommunications instrument so that such instrument may be used to obtain telecommunications service without authorization.

Code Division Multiple Access
  An air interface technology that was developed by the U.S. military and commercialized by the U.S. company Qualcomm. CDMA assigns a code to all speech bits, sends a scrambled transmission of the encoded speech over the air and reassembles the speech to its original form at the other end. CDMA supports SMS with a message length of 120 characters. With CDMA, each conversation is digitized and then tagged with a code. The mobile phone receives a signal to locate that particular code and it then deciphers the conversation off the airwaves. It codes each conversation expanding it 128 times, making it easy to decipher at the receiving end.

  Placement of multiple antennas at a common physical site to reduce environmental impact and real estate costs and speed zoning approvals and network deployment.

Commercial Mobile Radio Service
  An FCC designation for any carrier or licensee whose wireless network is connected to the public switched telephone network and/or is operated for profit.

Communications Assistance to Law Enforcement Act
  A 1994 law granting law enforcement agencies the ability to wiretap new digital networks and requiring wireless and wireline carriers to enable surveillance equipment use in digital networks.

Competitive Local Exchange Carrier
  Any telephone company that offers service in a specific area. Now that the industry has been deregulated, several companies may offer service in a single area. New ones entering a market are Competitive Local Exchange Carriers. The original telephone company at the time of deregulation is known as the Incumbent Local Exchange Carrier (See also "ILEC").

Content Services
  Paging service, beyond telephone number alerts, that include news and sports headlines, personalized stock quotes, driving directions, restaurant reviews and information contained on Internet sites.

Control Channel
  A logic channel carrying network information rather than the actual voice or data messages transmitted over the network.

  Refers to the region within which a paging receiver can reliably receive the transmission of the paging signals.

  Interference in a wireless communications system from other conversations in nearby cells using the same channel.

Customer Acquisition Cost
  The average cost to a carrier of signing up an individual subscriber. Some of the factors included in the cost are handset subsidies, marketing, advertising and promotions.

D and E PCS Blocks
  The fourth and fifth PCS licenses that were auctioned by the FCC in January 1997. Each contains MHz of spectrum in the 1900 MHz band and is based on BTA geographical partitions. The licenses were reserved for smaller businesses and entrepreneurs.

  A unit of measure used to express relative difference in power or intensity of sound.

  A method of encoding information using a binary code of 0s and 1s from electrical pulses. Because digital signals are made up only of binary streams, less information is needed to transmit a message. Digital encoding therefore increases the capacity of a given radio frequency. Furthermore, only digitized information can be transported through a noisy channel without degradation. Digital technology reproduces sound exactly, and can even filter out background and electronic "noise." Even if corruption occurs, as long as the one zero patterns are recognizable, the original information content can be perfectly replicated at the receiving end. Most new wireless phones and networks use digital technology.

Digital Cellular System
  A global system for mobile communications-based PCS network used outside of the U.S.

Digital Signal Processor
  A microprocessor that digitizes analog signals.

  The splitting of a spectrum license into two or more licenses of fewer frequencies.

  The portion of a telecommunications path from a satellite to the ground. Also referred to as the reverse link.

Drive Test
  A method of taking signal strength measurements in a cellular coverage area.

Dual Band
  A feature on some wireless phones that allows the handset to operate using either the 800 MHz cellular or the 1900 MHz PCS frequencies.

Dual Mode
  A feature on some wireless phones that allows the handset to operate on both analog and digital networks.

Electromagnetic Energy
  Waves of electrical and magnetic energy moving together through space. Also called electromagnetic radiation.

Electromagnetic Field
  An area containing electromagnetic energy (electromagnetic radiation).

Electromagnetic Radiation
  Waves of electrical and magnetic energy moving together through space. Also called electromagnetic energy.

Electromagnetic Spectrum
  The collection of all electromagnetic energy arranged according to frequency and wavelength.

Electronic Serial Number
  The unique identification number embedded in a wireless phone by the manufacturer. Each time a call is placed, the ESN is automatically transmitted to the base station so the wireless carrier's mobile switching office can check the call's validity. The ESN cannot easily be altered in the field. The ESN differs from the mobile identification number, which is the wireless carrier's identifier for a phone in the network. MINs and ESNs can be electronically checked to help prevent fraud.

  The process of encoding a message such as a digital phone signal to prevent it from being read by unauthorized parties.

Enhanced 911
  911 service becomes E911 when automatic number identification and automatic location information from a wireless phone is provided to the 911 operator. Reimbursement, or cost recovery, is due to commercial providers of both recurring and nonrecurring costs associated with any services, operation, administration or maintenance of wireless E911 service. Costs include, but are not limited to, the costs of design, development, upgrades, equipment, software and other expenses associated with the implementation of wireless E911 service.

Enhanced Data for GSM Evolution
  The final evolution of data communications within the GSM standard. Based on 8PSK modulation, EDGE provides 3G packet data throughput on GSM networks, and uses a new modulation scheme to enable data throughput speeds of up to 384kbit/s using existing GSM infrastructure.

Enhanced Specialized Mobile Radio
  Digital SMR networks that provide dispatch, voice, and messaging and data services.

European Telecommunications Standards Institute
  A standards-setting body in Europe. Also the standards body responsible for GSM.

F PCS Block
  The final PCS license that was auctioned by the FCC in January 1997. Each contains 10 MHz of spectrum in the 1900 MHz band and is based on BTA geographic partitions. The licenses were reserved for small businesses and entrepreneurs.

Federal Communications Commission
  The federal government agency located in Washington, D.C. responsible for regulating telecommunications in the United States, including commercial and private wireless spectrum management.

Fiber Optic
  Using fine, transparent lines for the transmission of data, digitally encoded into pulses of light. In terms of telephone conversations, a 1/2" copper cable can transmit about 25 conversations analog, whereas a 1/2" fiber optic line can transmit 193,536 conversations digitally.

  Originally developed by Apple, this is an increasingly popular and very fast external bus for transferring data between devices; also known as IEEE 1394 for the name of the standard it engendered.

Flash Memory
  A component used for memory that can retain information without power.

Foliage Attenuation
  Reductions in signal strength or quality due to signal absorption by trees or foliage obstructions in the signal's line-of-sight path. For example, 800 MHz systems are seldom deployed in forested areas. Pine needles -- nearly the same length as 800 MHz antennas -- can negatively affect signal reception in that band.

Frame Relay
  Wideband, packet-based interface used to transmit bursts of data over a wide-area network. Seldom used for voice.

  The number of oscillations, or vibrations, of radio waves per unit of time, usually expressed in either cycles-per-second or Hertz (Hz).

Frequency Modulation
  A signaling method that varies the carrier frequency in proportion to the amplitude of the modulating signal.

Frequency Reuse
  The ability to use the same frequencies repeatedly across a cellular system, made possible by the basic design approach for cellular. Since each cell is designed to use radio frequencies only within its boundaries, the same frequencies can be reused in other cells not far away with little potential for interference. The reuse of frequencies is what enables a cellular system to handle a huge number of calls with a limited number of channels.

  Node that connect two different networks.

Gateway GPRS Support Node
  Interface between the GPRS wireless data network and other networks such as the Internet or private networks.

General Packet Radio Service
  A GSM data transmission technique that does not set up a continuous channel from a portable terminal for the transmission and reception of data, but transmits and receives data in packets. GPRS is used to boost wireless data transmission over GSM networks. GPRS can achieve 171.2 kilobits per second (kbps), which is about three times as fast as the data transmission speeds possible over today's fixed telecommunications networks and ten times as fast as current GSM networks. Unlike existing digital wireless Net connections, no dial-up modem is necessary.

Global Positioning System
  A system of 24 satellites for identifying earth locations, launched by the U.S. 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. Lets those on the ground, on the water or in the air determines their position with extreme accuracy using GPS receivers.

Global System for Mobile Communications
  GSM is a digital cellular phone technology based on TDMA that is the predominant system Europe, the Middle East, Africa, Asia and in parts of America and Canada. First introduced in 1991, the GSM standard has been deployed at three different frequency bands: 900 MHz, 1800 MHz and 1900 MHz. GSM 1900 is primarily deployed in North America. Named after its frequency band around 900 MHz, GSM-900 has provided the basis for several other networks using GSM technology. GSM uses narrowband TDMA which allows eight simultaneous calls on the same radio frequency. Along with CDMA and TDMA it represents the second generation of wireless networks.

  Second major LEO-based global communications system; initially created for voice, it was launched in late 1999.

GSM 1800
  Also known as DCS 1800 or PCN, GSM 1800 is a digital network working on a frequency of 1800 MHz. It is used in Europe, Asia-Pacific and Australia.

GSM 1900
  Also known as PCS 1900, GSM 1900 is a digital network working on a frequency of 1900 MHz. It is used in the US and Canada and is scheduled for parts of Latin America and Africa.

GSM 900
  The world's most widely used digital network and now operating in over 100 countries around the world, particularly in Europe and Asia Pacific.

GSM Hosted SMS Teleservice
  A tunneling protocol that allows a GSM SMS to be embedded in a teleservice that can be transmitted over the air interface of a TDMA based network.

  A variant of GSM, Half-Rate doubles system capacity by more efficient speech coding.

Handheld Device Markup Language
  A specialized version of HTML designed to enable wireless pagers, cell phones and other handheld devices to obtain information from Web pages. HDML was developed by (formerly Unwired Planet) before the WAP specification was standardized. It is a subset of WAP with some features, not included in WAP. AT&T Wireless launched the first HDML-based service in 1996.

  The process by which the Mobile Telephone Switching Office passes a cellular phone conversation from one radio frequency in one cell to another radio frequency in another. The handoff is performed so quickly that users usually never notice.

Handset Subsidy
  Frequently, a wireless company will sell a phone (handset) below cost, with the hope of making up the loss later on customer usage fees. The amount of loss per handset is called the handset subsidy.

  An important safety feature that's included with most of today's mobile phones. It permits drivers to use their cellular phone without lifting or holding the hand-set to their ear.

  A unit of measurement of one cycle per second when one radio wave passes one point in one second of time. Named in honor of Heinrich Hertz, the physicist who developed the theory of radio waves.

High-Speed Circuit Switched Data
  The final evolution of circuit switched data within the GSM environment. HSCSD enables the transmission of data over a GSM link at speeds of up to 57.6kbit/s. This is achieved by concatenating consecutive GSM timeslots, each of, which is capable of supporting 14.4kbit/s. Up to four GSM timeslots are needed for the transmission of HSCSD.

Home Location Register
  A database residing in a local wireless network that contains service profiles and checks the identity of a local subscriber.

  NTT DoCoMo's mobile Internet access, launched in February 1999. I-mode is an alternative to WAP, though it is only implemented in Japan. It offers Internet access and email service. While WAP uses HDML, I-mode relies on Compact HTML (C-HTML). Both languages are a simple version of HTML, for use on mobile phones. Today more than 7000 sites are I-mode compatible and offer a wide range of services over mobile phones: mobile banking, ticket reservation, cartoons downloading, etc.

Incumbent Local Exchange Carrier
  The historic local phone service provider in a market, often a former Bell company. Distinct from competitive local exchange carriers (CLECs), new market entrants.

Independent Telephone Network
  Companies not affiliated with the local telephone companies.

Industrial Telecommunications Association
  A Washington, D.C. trade group serving private wireless licensees such as airlines and oil companies.

Infrared Data Association
  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.

Integrated Circuit Card ID
  19 or 20-digit serial number of the SIM card.

Integrated Digital Enhanced Network
  A wireless communications technology from Motorola that provides support for voice, data, short messages (SMS) and dispatch radio (two-way radio) in one phone. Operating in the 800MHz and 1.5GHz bands and based on TDMA, iDEN uses Motorola's VSELP (Vector Sum Excited Linear Predictors) vocoder for voice compression and QAM modulation to deliver 64 Kbps over a 25KHz channel. Each 25KHz channel can be divided six times to transmit any mix of voice, data, dispatch or text message. Used by various carriers around the globe, Nextel Communications provides nationwide coverage in the U.S.

Intelligent Roaming Database
  A list of acceptable and unacceptable networks for a phone to roam with stored either on a SIM card or in the phone.

Interactive Messaging
  Short Message Service that allows users to send alphanumeric messages from their wireless handset to other wireless handsets or to email addresses. Interactive Messaging also allows the user to receive emails and web messages from the internet.

  The connecting of one network with another, e.g. a cellular carrier's wireless network with the local exchange.

Interim Standard
  A designation of the Telecommunications Industry Association --usually followed by a number--that refers to an accepted industry protocol; e.g., IS-95, IS-136, IS-54.

International Mobile Equipment Identifier
  A unique 15-digit number that serves as the serial number of the GSM handset. The IMEI appears on the label located on the back of the phone. The IMEI is automatically transmitted by the phone when the network asks for it. A network operator might request the IMEI to determine if a device is in disrepair, stolen or to gather statistics on fraud or faults.

International Mobile Subscriber Identifier
  A unique 15-digit number which designates the subscriber. This number is used for provisioning in network elements.

International Mobile Telecommunications Association
  A trade group serving specialized mobile radio and public access mobile radio carriers around the world.

International Telecommunication Union
  An agency of the United Nations, headquartered in Geneva that furthers the development of telecommunications services worldwide and oversees global allocation of spectrum for future uses.

  The ability of a network to operate with other networks, such as two systems based on different protocols or technologies.

Ionizing Radiation
  Very high energy electromagnetic radiation that strips electrons away from their normal locations in atoms and molecules.

  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.

  The latest generation of the digital standard TDMA technology.

  The network standard that allows all switches to exchange information about subscribers.

  The first generation of the digital standard TDMA technology.

  North American standard for 1.9 GHz wireless spread spectrum radio-frequency access technology based on a composite of CDMA and TDMA technologies To reduce infrastructure costs and allow higher data speeds than mainstream GSM or TDMA platforms.

  The standard for CDMA.

Japanese Total Access Communication
  Like the European TACS, JTAC is the Japanese analog cellular system.

Land Line
  Traditional wired phone service. Voice, video and data transmission technology that relies on wires. Also called wireline.

Lithium-Ion Battery
  Lighter weight battery than earlier types, having relatively longer cycle life and generally do not suffer from memory effect.

Local Calling Area
  The geographical area that a customer may call without incurring toll charges.

Local Mulitpoint Distribution Service
  Located in the 28 GHz and 31 GHz bands, LMDS is a broadband radio service designed to provide two-way transmission of voice, high-speed data and video (wireless cable TV).

Local Number Portability
  The ability of subscribers to switch local or wireless carriers and still retain the same phone number, as they can now with long-distance carriers. Wireless carriers do not have to offer LNP until March 2002 and seek further postponement of this deadline.

Local Service Footprint
  The geographical area that a customer may call without incurring toll charges, also known as "local service area," or "local calling area."

Local-State Governmental Advisory Committee
  An FCC-established group that is working on an antenna-siting solution. The LSGAC will advise carriers and communities on antenna siting.

Low Earth Orbit
  A term used to describe the orbital altitude range (500 to 2000 km above the surface of the Earth) of certain communications satellites.

Major Trading Area
  Usually composed of several contiguous basic trading areas. A service area designed by Rand McNally and adopted by the FCC. There are 51 MTAs in the United States.

Memory Effect
  The life of a battery may be gradually shortened if it is recharged before it is completely discharged. Memory effect most commonly occurs with Nickel Cadmium batteries are less of a problem with Nickel Hydride batteries and even less with Lithium Ion batteries.

Metropolitan Statistical Area
  One of 306 geographic regions, primarily urban areas, in the United States that are used as license areas in the cellular frequency band. Originally, two wireless operators were licensed in each MSA.

  A cell having a very small coverage area, which could be as small as one floor of an office building, one part of an airline terminal, or one corner of a busy intersection. These cells are typically used when coverage and/or capacity is strained and the use of a normal sized cell would cause interference or would be impractical to install. These cells transmit with extremely low power outputs.

  A subset of radio waves that have frequencies ranging from around 300 million waves per second (300 MHz) to three billion waves per second (3 GHz).

  The "mix-and-match" communications software that acts as a universal translator between diverse radio frequency technologies and protocols. Middleware resides on a remote client and a communications server, located between the client and the applications server. The software eases computing and communicating with corporate information and encourages applications development, making wireless data more attractive to corporate customers.

Mobile Identification Number
  Uniquely identifies a mobile unit within a wireless carrier's network. The MIN often can be dialed from other wireless or wireline networks. The number differs from the electronic serial number (ESN), which is the unit number assigned by a phone manufacturer. MINs and ESNs can be checked electronically to help prevent fraud.

Mobile Satellite Service
  Powerful communications transmission service provided by satellites. A single satellite can provide coverage to the whole United States.

Mobile Telephone Switching Office
  The central switch that controls the entire operation of a cellular system. It is a sophisticated computer that monitors all cellular calls, tracks the location of all cellular-equipped vehicles traveling in the system, arranges handoffs, keeps track of billing information, etc.

Modem Pools
  Racks of modems used to deliver reliable cellular data communications.

Multipath Propagation
  Signal distortion when a signal is reflected from nearby surfaces on its way to a receiver.

  When multiple phone calls are carried in the same frequency band at the same time. In wireless, major multiplexing methods include TDMA and CDMA.

Mutual Compensation
  The concept that carriers must pay when they terminate traffic on the networks of carriers with which they are interconnected.

Mutually Exclusive Applications
  Two or more applications for the same spectrum use rights.

Narrowband Advanced Mobile Phone System
  Combines cellular voice processing with digital signaling, increasing the capacity of AMPS systems and adding functionality.

Narrowband PCS
  The next generation of paging networks, including two-way, acknowledgment and "wireless answering machine" paging.

National Emergency Numbering Association
  NENA's mission is to foster the technological advancement, availability and implementation of a universal emergency telephone number system.

National Telecommunications and Information Administration
  The federal government's executive branch advisory committee for telecommunications.

  Any system that was designed to provide one or more access paths for communication between users at different geographic locations. Communication networks may be designed for voice, text, data, fax and video. They may feature limited access (private networks) or open access (public networks), and will rely upon whatever analog or digital switching and transmission technologies are appropriate.

Nickel Cadmium Battery
  A rechargeable battery that typically lasts for 700 charge and discharge cycles. If not completely discharged before recharging, the NiCd battery can suffer from memory effect that may reduce the life of the battery. Non-Ionizing Radiation: Levels of electromagnetic radiation that is too low to strip electrons away from their normal locations in atoms and molecules.

Nickel Metal Hydride Battery
  A rechargeable battery that is capable of holding more power that a NiCd battery and suffers much less from memory effect. It is also typically more expensive than a NiCd battery.

Nordic Mobile Telephone
  An older analog cellular protocol used in Europe and elsewhere.

North American Cellular Network
  An organization of cellular providers that facilitates cellular calls across the country to be linked for seamless roaming.

North American Numbering Council
  The FCC advisory group formerly responsible for administering the North American Numbering Plan that oversees assignment of area codes, central office codes and other numbering issues in the United States, Canada, Bermuda and part of the Caribbean. NANC administration responsibility was transferred to Lockheed Martin.

Number Assignment Module
  The NAM is the electronic memory in the cellular phone that stores the telephone number and an electronic serial number. Phones with dual- or multi-NAM features offer users the option of registering the phone with a local number in more than one market.

Number Pooling
  Increasingly popular tactic for conserving phone numbers. Numbers are returned by all carriers to a central authority, which puts them in a pool, from which carriers receive numbers in lots of 1,000, not 10,000 as was originally done. Smaller lots of numbers reduce their cost and maximize the availability of new numbers to meet public demand.

Number Portability
  A term used to describe the capability of individuals, businesses and organizations to retain their existing telephone number(s) and the same quality of service when switching to a new local service provider.

  Periods of time during which carriers offer discounted airtime charges. Each carrier designates its own off-peak hours, usually after normal business hours during the week, and weekends.

Omnibus Budget Reconciliation Act of 1993
  The first legislation authorizing the FCC to auction spectrum.

Operators Harmonization Group
  A worldwide organization of operators and manufacturers dedicated to achieving a uniform standard for third-generation wireless systems.

Overlay Area Code
  A solution to the scarcity of new phone numbers, overlays involve issuance of new 10-digit phone numbers for use alongside an area's existing seven-digit numbers, which have a different area code.

Over-The-Air Service Provisioning
  The ability of carriers to add new types of services to a customer's handset by using the wireless network instead of requiring the customer to bring the phone to a carrier's location for reprogramming.

  Dividing a spectrum license into two or more geographic areas.

PCS Phone
  A wireless telephone that uses radiofrequency signals in the 1850-1990 megahertz (MHz) portion of the radiofrequency (RF) spectrum. PCS stands for portable communication system.

  Highest-usage period of the business day when a cellular system carries the most calling traffic.

  The total number of subscribers for a carrier divided by the population that it serves expressed as a percentage.

Personal Communications Industry Association
  A trade group representing PCS, SMR, private radio and other wireless users and carriers.

Personal Communications Service
  A second-generation digital voice, messaging and data cell phone system in the 2GHz range. PCS is supported mostly by GSM. PCS systems use a different radio frequency (1.9 GHz band) than cellular phones and generally use all digital technology for transmission and reception. "Digital PCS" is a redundancy, as all PCS are digital, but the phrase is used in marketing to distinguish PCS from cellular.

Personal Digital Cellular
  The Japanese cellular standard.

Personal Identification Number
  A code used by a mobile telephone number in conjunction with an SIM card to complete a call.

PIN Unblocking Key
  If a GSM or GAIT subscriber enters the wrong PIN three times in a row, then the wireless mobile phone is locked until the PUK is entered.

Project 25
  A joint government/industry standard setting effort to develop technical standards for the next generation of two-way communications equipment.

Public Switched Telephone Network
  Traditional landline network that mobile wireless systems connect with to complete calls.

Public Utility Commission
  The state regulatory body charged with regulating utilities, including telecommunications.

Public-Safety Answering Point
  The dispatch office that receives 911 calls from the public. A PSAP may be local fire or police department, an ambulance service or a regional office covering all services.

Pull SMS
  The ability to request services (e.g. ringtones or games) from a wireless handset via Wireless Internet. The service requested is sent back to the handset via SMS.

Push SMS
  The ability to request services (e.g. ringtones or games) from a wireless handset via sending a preset SMS code to a predetermined number. The service requested is sent back to the handset via SMS.

  The emission and transmission of energy through space or through a material medium.

Radio Frequency
  The spectrum of electromagnetic energy between audio and light: 500 KHz to 300 GHz.

Radio Waves
  Electromagnetic energy with frequencies in the 3000 hertz (3 kHz) to 300 billion Hertz (300 GHz) portion of the electromagnetic spectrum.

Radio-Frequency Fingerprinting
  A process that identifies a cellular phone by the unique "fingerprint" that characterizes its signal transmission. RF fingerprinting is one process used to prevent cloning fraud, because a cloned phone will not have the same fingerprint as the legal phone with the same electronic identification numbers.

Rate Center
  The geographic area used by local exchange carriers to set rate boundaries for billing and for issuing phone numbers.

  Device that receives a radio signal, amplifies it and retransmits it in a new direction. Used in wireless networks to extend the range of base station signals, expanding coverage more economically than building additional base stations. Repeaters typically are used for buildings, tunnels or difficult terrain.

  The ability to use your cellular phone outside your usual service area when traveling outside of the "home" service area defined by a service provider. Higher per-minute rates are usually charged for calls made or received while roaming. Long distance rates and a daily access fee may also apply.

Roaming Agreement
  An agreement between two or more wireless telephone companies outlining the terms and conditions under which the participating companies will provide wireless service to each others subscribers. Roaming agreements commonly are used where no one company can offer complete national and international coverage.

Round-Up Calls/Billing
  When calls are billed by the minute, any call that uses a portion of a minute is rounded up and billed for the whole minute. For example, if you make a call that lasts 3 minutes and 2 seconds, you are billed for a 4-minute call.

  The frequency spectrum near 2 GHz used for land based microwave and some mobile satellite communications.

Service Charge
  The amount customers pay each month to receive wireless service. This amount is fixed, and to be paid monthly regardless of how much or how little customers use their wireless phones.

Service Plan
  The rate plan you select when choosing a wireless phone service. A service plan typically consists of a monthly base rate for access to the system and a fixed amount of minutes per month. Service plans are designed to provide the most cost-effective rates for different types and amounts of usage by the cellular subscriber.

Short Message Service
  The transmission of short alphanumeric text-messages to and from a mobile phone, fax machine and/or IP address. Messages must be no longer than 160 alphanumeric characters and contain no images or graphics. Once a message is sent, it is received by a Short Message Service Center (SMSC), which must then get it to the appropriate mobile device.

Short Message Service Center
  The hardware device submitting the messages. Currently, SMSC devices support binary formats.

SIM Card
  A small printed circuit board that must be inserted in any GSM-based mobile phone when signing on as a subscriber. It contains subscriber details, security information and memory for a personal directory of numbers. The card can be a small plug-in type or sized as a credit-card but has the same functionality. The SIM card also stores data that identifies the caller to the network service provider.

Simple Network Paging Protocol
  A sequence of commands and replies where pages are delivered to individual paging terminals. The most obvious benefit is the elimination of the need for modems and phone lines to produce alphanumeric pages, and the ease of delivery of pages to terminals in other cities or countries.

  A signaling technique that broadcasts the same signal over multiple sites in a network.

Sleep Mode
  Designed to conserve battery life, this mode automatically turns off a terminal after it has been unused for a specified period of time. The unit is reactivated when the keypad is touched.

Smart Antenna
  An antenna system that focuses its beam on a desired signal to reduce interference. A wireless network employs smart antennas at its base stations in an effort to reduce the number of dropped calls, improve call quality and improve channel capacity.

Smart Card
  A plastic card containing important data about a person's identity to allow access to a network or premises. Also, a card containing subscriber information, often inserted into GSM phones for roaming in different countries.

Smart Phone
  A class of wireless phone handsets with many features, and often a keyboard. What makes the phone "smart" is its ability to handle data, not only voice calls.

Soft Handoff
  When two base stations -- one in the cell site where the phone is located and the other in the cell site to which the conversation is being passed - both hold onto the call until the handoff is completed. The first cell site does not cut off the conversation until it receives information that the second is maintaining the call.

Soft Key
  A key below the phone's main display panel that performs special functions.

Space Division Multiple Access
  A variation of TDMA and CDMA that potentially will be used in high-bandwidth, third-generation wireless products.

Specialized Mobile Radio
  Dispatch service ("walkie-talkie-type" service used by taxis, delivery trucks, etc.). SMR providers in the United States operate in the 800 MHz and 900 MHz frequency bands.

Specific Absorption Rate
  A measure of the rate at which RF energy is absorbed by the body.

  The range of electromagnetic radio frequencies used in the transmission of sound, data and television.

Spectrum Allocation
  Federal government assignment of a range of frequencies for a category of use or uses. For example, the FCC allocated the 1900 MHz band for personal communications services. Allocation, accomplished in FCC proceedings, tracks new technology development. However, the FCC can shift existing allocations to respond to changes in spectrum demand.

Spectrum Assignment
  Federal government authorization for use of specific frequencies or frequency pairs within a given allocation, at specific geographic locations.

Spectrum Cap
  A limit to the allocated spectrum designated for a specific service.

Spread Spectrum
  Initially devised for military use, this radio transmission technology "spreads" information over greater bandwidth than necessary to resist jamming and other interference.

Standby Time
  The amount of time you can leave your fully charged cellular portable or transportable phone turned on before the phone will completely discharge the batteries. See Talk Time.

Stratospheric Platform
  Blimp-like platform for wireless telephone service in urban areas.

Strongest Signal
  The concept that a wireless 911 call should be routed to the cell site with the strongest link to the phone, regardless of which carrier holds the caller as a customer. A shortcoming is that strength of the call's setup link isn't always equal to that of the link the cell assigns for voice traffic because the latter can be weaker.

Subscriber Fraud
  Securing wireless service with intent to avoid payment. This is different from bad debt, which occurs when a known person or company has a payment obligation overdue and the debt cannot be collected.

Subscriber Identity Module
  A card inserted into a GSM/TDMA or GSM-only handset containing subscriber-related data. The card contains 18 digits for GSM markets and 20 digits for TDMA markets.

Subscriber Profiling
  Compiling subscriber usage information (such as frequency of calls, locations called to or from and monthly airtime usage), to identify potentially fraudulent use or to identify customers likely to terminate service. This information can also be used to target customers when marketing a carrier's product and service offerings.

  A mechanical, electrical or electronic device that opens or closes circuits, completes or breaks an electrical path, or selects paths or circuits.

Talk Time
  The length of time you can talk on your portable or transportable cellular phone without recharging the battery. The battery capacity of a cellular portable or transportable is usually expressed in terms of so many minutes of talk time or so many hours of standby time. When you're talking, the phone draws additional power from the battery. See Standby Time.

  A 3G proposal combining elements of TDMA and CDMA.

  The transmission of words, sounds, or images, usually over great distances, in the form of electromagnetic energy, for example by telegraph, telephone, radio, or television.

Telecommunications Industry Association
  The United States' telecommunications standards making body.

  The integration of wireless communications, vehicle monitoring systems and location devices.

Telematics Control Unit
  The embedded vehicle control unit that communicates with the automobile controls, GPS satellite and customer service center to provide Telematics features to a driver.

Telephone Network
  The system of wires, fiber-optic cables, satellites, and transmission towers that transmit telephone messages from caller to receiver.

Telephone Transmission Tower
  A telephone base station located on top of a tall, free-standing structure.

  Originally meaning voice (analog) communication by telephone (land line), this term has come to encompass virtually all telecommunications, because virtually all telecommunications can be done over or while connected to a telephone line.

Termination Charges
  Fees that wireless telephone companies pay to complete calls on wireline phone networks or vice versa.

Third Generation
  A new wireless standard promising increased capacity and high-speed data applications up to two megabits. Third generation wireless employ wideband frequency carriers and a CDMA air interface. Networks must be able to transmit wireless data at 144 kilobits per second at mobile user speeds. Implemented in Europe as UMTS and CDMA2000 in North America, its goals are high-quality multimedia and advanced global roaming (in house, cellular, satellite, etc.).

Time Division Multiple Access
  A method of digital wireless communications transmission allowing a large number of users to access a single radio-frequency channel without interference. Each user is given a unique time slot within each channel. SMS Mobile Originate has now gone live on several TDMA networks around the world including Telecom New Zealand, Midwest Wireless USA, Algar Telecom Brazil and Cellcom Israel. Other TDMA network operators such as AT&T Wireless in the U.S. have launched SMS nationally.

Total Access Communication System
  European analog cellular.

  Equipment to handle the broadcast and reception of radio signals with network or subscriber equipment.

  The process of pinning down a caller's location using three or more radio receivers, a compass and a map.

  A network infrastructure or wireless phone designed to operate in three frequency bands: 800 MHz, 900 MHz and 1800MHz.

  Phones that work on three modes GSM, TDMA and analog.

  Spectrum-efficient technology that establishes a queue to handle demand for voice or data channels.

Universal Mobile Telecommunications System
  The goal of UMTS is to enable networks that offer true global roaming and can support a wide range of voice, data and multimedia services. 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 offered by UMTS are: vehicular - 144 kbit/s; pedestrian 384 kbit/s; in-building 2Mb/s.

Universal Wireless Communications Consortium
  An industry group supporting TDMA and WIN technology.

  The portion of a telecommunications path from the ground to the satellite, also referred to as the forward link.

  A third-generation wireless standard proposal based on TDMA technology that was developed by the Universal Wireless Communications Consortium and is one of the 3G candidates submitted to the International Telecommunication Union by the United States. UWC-136 represents an evolutionary path for both the old analog Advanced Mobile Phone System (AMPS) and the second-generation TIA/EIA-136 technologies, which were designed specifically for compatibility with AMPS. UWC-136 radio transmission technology proposes a low-cost incremental, evolutionary deployment path for both AMPS and TIA/EIA operators. The technology is tolerant of the frequency band in which it is deployed: 500 MHz to 2.5 GHz.

Visitor Location Register
  A network database that holds information about roaming wireless customers.

Voice Activation
  A convenient safety feature that allows a subscriber to dial a phone by voice instead of physically punching in the numbers.

Voice Recognition
  The capability for cellular phones, PCs and other communications devices to be activated or controlled by voice commands.

  The distance covered by one cycle of a wave.

Wideband CDMA
  A 3G mobile services platform, based on modern, layered network-protocol structure, similar to the protocol structure used in GSM networks. WCDMA has been designed for high-speed data services and more particularly, internet-based packet-data offering up to 2Mbps in stationary or office environments, and up to 384Kbps in wide area or mobile environments. The third generation radio standard that will offer voice, data, motion-video and other multimedia capabilities, and 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 (cdmaOne).

Wideband Packet CDMA
  A technical proposal from Golden Bridge Technology that wraps WCDMA and cdma2000 into one standard.

Wireless Application Protocol
  An open standard for communication between handsets and the Internet. WAP is a wireless communications environment for delivering web data to wireless terminals with minimal screen display. An initiative started by Unwired Planet, Motorola, Nokia and Ericsson to develop a standard for wireless content delivery on the next generation of mobile communicators. WAP strips all but graphics for display on small screens, such as mobile phones. A mini-browser is an integral part of WAP enabled phones. WAP enabled phones first appeared in Europe at the end of 1999.

Wireless Communications Services
  The variety of services available using frequencies in the 2.3 GHz band for general fixed wireless use.

Wireless Instant Messaging
  Bridges the gap between wired and wireless networks. WIM seamlessly allows a desktop user to instantly send a message to a handset.

Wireless Intelligent Network
  The architecture needed to match the capabilities of the wireline intelligent network. In addition to transparent roaming, selective call screening, short message service and pre-paid billing are features that a WIN can provide.

Wireless Markup Language/Script
  The languages used to create WAP pages. WML is similar to the way HTML is used to create web pages and WMLScript is based on JavaScript. Both are adapted and optimized for a wireless environment (compression to save bandwidth).

Wireless Telephone Base Station
  The combination of antennas and electronic equipment used to receive and transmit wireless telephone signals. Sometimes called a base station.

Wireless Transport Layer Security
  The security layer of the WAP which provides privacy, data integrity and authentication for WAP services. WTLS, designed specifically for the wireless environment, is needed for the client and server to be authenticated in order for wireless transactions to remain secure and also because the connection needs to be encrypted. For example, a user making a transaction with a bank over a wireless device needs to know that the connection is secure and private and not subject to a security breach during transfer. WTLS is needed because mobile networks do not provide complete end-to-end security.

  Traditional telephone technology that relies upon wires. Also called land line.