| < Prev | Next > |
| |
|
| 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 (ESN) |
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. |
| Encryption |
The process of encoding a message such as a digital phone signal to prevent it from being read by unauthorized parties. |
| Enhanced 911 (E911) |
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. |
| Flash Memory |
A component used for memory that can retain information without power. |
| Frame Relay |
Wideband, packet-based interface used to transmit bursts of data over a wide-area network. Seldom used for voice. |
| Frequency |
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 (FM) |
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. |
| Gateway |
Node that connect two different networks. |
| Gateway GPRS Support Node (GGSN) |
Interface between the GPRS wireless data network and other networks such as the Internet or private networks. |
| General Packet Radio Service (GPRS) |
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.
GPRS enabled phone can collect e-mail and view WAP pages. Costs for such services are based on the amount of data received, though some contracts include elements of GPRS time. |
| Global Positioning System (GPS) |
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) |
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. |
| 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 (GHOST) |
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. |
| |
|
| < Prev | Next > |
