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There are 33 names in this directory beginning with the letter G.

Gain refers to the ratio of the output amplitude of a signal to the input amplitude of a signal. This ratio typically is expressed in dBs. The higher the gain, the better the antenna receives or transmits but also the more noise it includes.

GAN: Global Area Network

Global Area Network (GAN) is a network that is composed of different interconnected computer networks and covers an unlimited geographical area.

Gaussian channel

Gaussian channel is an RF communications channel having the properties of a wide-band uniform noise spectral density resulting in a random distribution of errors in the channel.

GEOS: Geo-stationary Earth Orbit Systems

Geo-stationary Earth Orbit Systems (GEOS) is a communications system with satellites in geosynchronous orbits — 22,300 miles above the Earth.

Geosynchronous Orbit

A geosynchronous orbit has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km.

GERAN: GSM (GPRS)/EDGE Radio Access Netw

GSM(GPRS)/EDGE Radio Access Network (GERAN) is the name given to the 3GPP standards for GSM(GPRS)/EDGE radio access, which has been specified to connect the A, Gb and Iu interfaces to the CN (Core Network). The architecture allows two BSS (Base Station Subsystem) to be connected to each other.

GGSN: Gateway GPRS Support Node

Gateway GPRS Support Node (GGSN) is a gateway from a cellular network to an IP network that allows mobile cell phone users to access the public data network (PDN) or specified private IP networks. The GPRS Core Network is the centralised part of the GPRS system and also provides support for UMTS-based 3G networks.

GHz: GigaHertz

GigaHertz (GHz) is one billion hertz, which is a measurement of frequency.

Gi interface

Gi interface is the reference point between a GPRS network and an external packet data network.

GIS: geographic information system

Geographical Information System (GIS) refers to a computer system capable of capturing, storing, analyzing, and displaying geographically referenced information, that is, data identified according to location. Practitioners also define a GIS as including the procedures, operating personnel, and spatial data that go into the system.

GLONASS: global navigation system

Global navigation system (GLONASS) is a Russian satellite location technology similar to global positioning system.

GMM: GPRS Mobility Management

GPRS Mobility Management (GMM) is a GPRS signaling protocol that handles mobility issues such as roaming, authentication, and selection of encryption algorithms. GPRS Mobility Management, together with Session Management (GMM/SM) protocol, supports the mobility of user terminal so that the SGSN can know the location of a mobile station (MS) at any time and to activate, modify and deactivate the PDP sessions required by the MS for the user data transfer.

GMM/SM: GPRS Mobility Management / Sessi

GPRS Mobility Management/Session Management (GMM/SM) protocol supports mobility management functionality of a mobile such as GPRS attach, GPRS detach, security, routing area update, location update. The main function of the Session Management (SM) layer is to support PDP context handling of the user terminal. SM comprises of procedures for the PDP context activation, deactivation and modification. The GMM layer uses the services of the Radio Access Network Application Protocol (RANAP) over the Iu interface to provide these services.

GMPCS: Global Mobile Personal Communicat

Global Mobile Personal Communications Services (GMPCS) is a mobile satellite systems that will provide global wireless phone service.

GMSK: Gaussian Minimum Shift Keying

Gaussian Minimum Shift Keying (GMSK) is a modulation technique involving Gaussian filtering of the input data prior to its application to the phase modulator. This results in a narrowly occupied spectrum and better adjacent channel interference performance.

Gn Interface

Gn Interface is the interface between GSNs within the same PLMN in a GPRS network. GPRS Tunneling Protocol (GTP) is a protocol defined on both the Gp and Gn interfaces between GSNs in a GPRS network.

GOS: Grade of Service

Grade of Service (GOS) is a measure of the success a subscriber is expected to have in accessing a network to complete a call. The grade of service is usually expressed as percentage of calls attempted by the subscriber during the busy-hour that are blocked due to insufficient network resources.

Gp Interface

Gp Interface is the Interface between GSNs within different PLMNs in a GPRS network. GPRS Tunneling Protocol (GTP) is a protocol defined on both the Gp and Gn interfaces between GSNs in a GPRS network.

GPRS: General Packet Radio Service

General Packet Radio Service (GPRS) technology runs at speeds of up to 115Kbit/sec., compared with the 9.6Kbit/sec. of older GSM systems. It enables high-speed wireless Internet and other communications such as e-mail, games and applications. It supports a wide range of bandwidths and is an efficient use of limited bandwidth. It's particularly suited for sending and receiving small amounts of data, such as e-mail and Web browsing, as well as large volumes of data.

GPS: Global Positioning System

The Global Positioning System (GPS) is a “constellation” of 24 satellites that orbit the Earth at a height of 10,900 miles, making it possible for people using ground receivers to determine their geographic location within 10 to 100 meters. The satellites use simple mathematical calculations to broadcast information that is translated as longitude, latitude and altitude by Earth-based receivers.

GPT: GPRS Tunneling Protocol

GPRS Tunneling Protocol (GTP) is a protocol used by the GPRS backbone network for packet switching. GTP is a protocol defined on both the Gn and Gp interfaces between GSNs in a GPRS network.

Ground Station

Ground Station, also called a downlink station, refers to the collection of communications equipment designed to receive signals from (and usually transmit signals to) satellites.

GSM 1800

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

GSM 1900

GSM 1900, also known as PCS 1900, is a mobile 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

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

GSM plus

GSM plus is an enhanced version of global system for mobile communications (GSM) technology that will be developed to meet IMT-2000 capabilities

GSM-R: GSM for Railway networks

Global system for mobile communications for Railway networks (GSM-R) uses standard base station and switching infrastructure to provide fast data transmission for railways

GSM: Global System for Mobile Communicat

Global System for Mobile Communications (GSM), origionally known as Groupe Spécial Mobile, is a digital cellular system defined by ETSI based on TDMA narrowband technology. GSM allows up to eight simultaneous communications on the same frequency. GSM is widely deployed in Europe and some Asian Countries, competing with CDMA which was developed by Qualcomm and deployed mainly in the US.

GSN: GPRS Support Nodes

GPRS Support Node (GSN) is a network node which supports the use of GPRS in the GSM core network. All GSNs should have a Gn interface and support the GPRS tunnelling protocol. There are two key variants of the GSN: the GGSN and the SGSN.

GTP Tunnel

GTP Tunnel is used to communicate between an external packet data network and a mobile station in a GPRS network. A GTP tunnel is referenced by an identifier called a TID and is defined by two associated PDP contexts residing in different GSNs. A tunnel is created whenever an SGSN sends a Create PDP Context Request in a GPRS network.

GTP: GPRS Tunnelling Protocol

GPRS Tunnelling Protocol (GTP) allows end users of a GSM or UMTS network to move from place to place whilst continuing to connect to the internet as if from one location at the GGSN. It does this by carrying the subscriber's data from the subscriber's current SGSN to the GGSN which is handling the subscriber's session. GTP version zero supports both signalling and user data under one generic header. It can be used with UDP (User Datagram Protocol) or TCP (Transmission Control Protocol) on the registered port 3386. GTP version one is used only on UDP. The control plane protocol GTP-C (Control) using registered port 2123 and the user plane protocol GTP-U (User) using registered port 2152

Guard Band

Guard Band is a set of frequencies or band-width used to prevent adjacent systems from interfering with each other. Guard bands are typically used between different types of systems at the edges of the frequency allocations.

GWEN: Ground Wave Emergency Network Gr

GWEN: Ground Wave Emergency Network Ground Wave Emergency Network (GWEN) is a communications system that the US military constructs. It operates in a very-low-frequency range, with transmissions between 150 and 175 kHz. This range was selected because its signals travel by means of waves that have a tendency to hug the ground rather than by radiating into the atmosphere. This signal drops off sharply with distance — a single GWEN stations transmits in a 360 circle to a distance of 250 to 300 miles. The entire GWEN system consists of approximately 300 such stations spread across the United States, each with a tower 300-500 feet high. The stations are from 200 to 250 miles apart, so that a signal can go from coast to coast or from one station to another. When the system is completed around 1993, the entire civilian population of the United States will be exposed to the GWEN Transmissions

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