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1G First generation of mobile wireless that utilizes analog air interface technology.
2G Second generation of mobile wireless, which utilizes various digital protocols, including GSM, CDMA, TDMA, iDEN, and PDC.
2.5 G Interim step building up to 3G involving overlay of higher-capacity data transmission capability to existing 2G digital wireless networks.
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.
Air Interface The standard operating system of a wireless network. Technologies include AMPS, TDMA, CDMA and GSM.
Airtime 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.
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.
cdma2000 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.
cdmaOne The name used by the CDMA Development Group (CDG) for CDMA networks (IS-95) using 2nd-generation digital technology.
Cell 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 covers 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.
Cellular 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 Telecommunications and Internet Association (CTIA) 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.
Circuit Switch Data (CSD) 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).
Code Division Multiple Access (CDMA) 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.

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Control Channel A logic channel carrying network information rather than the actual voice or data messages transmitted over the network.
Coverage Refers to the region within which a paging receiver can reliably receive the transmission of the paging signals.
   
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