مختصرات 4 _GSM

موضوع: مختصرات 4 _GSM السبت أغسطس 30, 2008 9:45 am

ولسه

Java
A programming language developed by Sun Microsystems Java is characterised by the fact that programs written in Java do not rely on an operating system

JPEG
Joint Photographic Experts Group

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
LAN
Local Area Network

LANS
Local Area Network Services

LAP
Link Access Protocol

LEO
Low Earth Orbit; refers to satellites which orbit the Earth at around 1,000 kilometres

LMSS
Land Mobile Satellite Service

LOS
Line of Sight

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
MAC
Media Access Control; the lower sublayer of the OSI system

MAN
Metropolitan Area Network

MAP
Mobile Application Part

Mbit/s
Megabit: a unit of data transmission speed equal to one million bits per second

MHz
Megahertz; a unit of frequency equal to one million Hertz

MCPA
Multi Carrier Power Amplifier

MeXe
Mobile Execution Environment; likely to be based on Java, MeXe enables WAP-enabled devices to offer a wider range of features with greater security and flexibility, as well as greater control of telephony features

MFSK
Multiple Frequency Shift Keying

MMI
Man Machine Interface

MMS
Multimedia Messaging Service; an evolution of SMS, MMS goes beyond text messaging offering various kinds of multimedia content including images, audio and video clips

MMSK
Modified Minimum Shift Keying

MNO
Mobile Network Operator

Modulation
The process of imposing an information signal on a carrier. This can be done by changing the amplitude (AM), the frequency (FM) or the phase, or any combination of these

MoU
Memorandum of Understanding-
see GSM MoU

MPEG
Motion Picture Experts Group; MPEG4 is a technology for compressing voice and video so that the information can be transmitted over normally difficult links such as mobile radio

MS
Mobile Station

MSC
Mobile Switching Centre; the switching centre of a mobile phone network, the MSC has interfaces to the BSCs, HLR, VLR and other MSCs

MSISDN
Mobile Station International ISDN Number

MSK
Minimum Shift Keying; Another term for FFSK

Multiplexing
A telecommunications technique where several channels can be combined to share the same transmission medium. The most common forms are Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM)

MVPN
Mobile Virtual Private Network

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
N-AMPS
Narrowband AMPS

NB
Normal Burst; used to carry traffic and control channels except RACH

NET
Norme Europeenne de Telecommunications

NMT
Nordic Mobile Telephone system; an analogue cellular technology deployed in the Nordic countries in the late 1970’s; variations were also deployed in the Benelux countries and in Russia. NMT operated in the 450 and 900MHz bands and was the first technology to offer international roaming, albeit only in the Nordic countries

Node B
The element in a UMTS network which interfaces with the mobile station, analogous to a BTS in a GSM network

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
OTA
Over the air activation (of services and tariff changes)

O&M
Operations and Maintenance

OMC
Operations and Maintenance Centre

OMC-R
The radio OMC

OMC-S
The switching OMC

OSI
Open Systems Interconnection; a seven layer model for protocols defined by ISO

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
PACS
Personal Access Communication System; a digital cordless technology developed initially by Bell Labs in the US, PACS was designed to compete with DECT

Packet switching
A communication system wherein the information is transmitted in packets of a set size. These packets have address headers and find their way to their destination by the most efficient route through the network. Compared to circuit switching where a connection is occupied until the traffic exchange is completed, packet switching offers considerable efficiencies as connections can be used by a number of users simultaneously

PAMR
Public Access Mobile Radio; Commercial service using trunking techniques in which multiple groups of users can set up their own closed systems within a shared public network

PAP
Public Access Profile; a DECT term

PCH
Paging Channel; downlink only, the MS is informed of incoming calls by the BTS via the PCH

PCM
Pulse Code Modulation; the standard digital voice format at 64kbit/s

PCMCIA
Personal Computer Memory Card Interface Association the body responsible for defining the standards and formats for memory expansion cards for laptop computers and PDAs. Now extended to cover cards for mobile phones

PCN
Personal Communications Network; a designation initially used in the UK to refer to networks operating in the 1800MHz band (see also DCS1800). No longer in use

PCS 1900
Personal Communications Systems 1900MHz; the terminology used in the US to describe the new digital networks being deployed in the 1900MHz band; rarely used today

PCU
Packet Control Unit; an element in a GPRS/UMTS network

PDA
Personal Digital Assistant

PDC
Personal Digital Communications; a digital cellular technology developed and deployed uniquely in Japan. A TDMA technology, PDC is incompatible with any other digital cellular standard

PEDC
Pan European Digital Communications; A designation occasionally used in the early 1990’s to describe GSM. No longer in use

Penetration
The percentage of the total population which owns a mobile phone

PHS / PHP
Personal HandyPhone System/Phone; a digital cordless technology developed in Japan which achieved great success. Deployed by NTT DoCoMo and other Japanese operators PHS offered two-way communications, data services and Internet access and eventually won some 28 million customers. Now in decline as cellular’s wide area capabilities offer better service

PIN
Personal Identifier Number

PKI
Public Key Infrastructure

PLMN
Public Land Mobile Network; any cellular operator’s network

PMR
Private Mobile Radiocommunications; two-way radio technology widely used for despatch and delivery services, taxi companies and the like. See TETRA

POCSAG
Post Office Code Standardisation Group; a now defunct industry grouping which standardised pager addressing systems

PoP
Points of Presence; a method of measuring the value of a cellular licence; the approximate number of potential customers within a geographical area

POTS
Plain Old Telephone Service

PROM
Programmable Read Only Memory

PSK
Phase Shift Keying

PSRCP
Public Safety Radio Communications Project; an initiative by the UK Government to standardise all emergency services communications on to a single digital technology (see TETRA)

PSDN
Public Switched Data Network

PSPDN
Public Switched Packet Data Network

PSTN
Public Switched Telephone Network

PSU
Power Supply Unit

PTO
Public Telecommunication Operator

PTT
Posts, Telephone and Telegraph Administration

PTT
Push-to-Talk; a feature of PMR systems

PWT
Personal Wireless Telecommunications; a variant of DECT developed for use in the USA

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
QAM
Quadrature Amplitude Modulation

QAPSK
Quadrature Amplitude Phase Shift Keying

QCELP
Quadrature Code Excited Linear Prediction

QoS
Quality of Service; a broad term to describe the performance attributes of an end-to-end connection

QPSK
Quadrature Phase Shift Keying

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
RACE
Research in Advanced Communications in Europe

RACH
Random Access Channel; uplink only, allows the MS to request an SDCCH in response to a page or for a call

RAM
Random Access Memory

RFP
Radio Fixed Part; equivalent to a base station in a DECT system

RCC
Radio Common Carrier

RELP
Regular pulse Excitation Linear Prediction coding

Reuse
The assignment of frequencies or channels to cells so that adjoining cells do not use the same frequencies and cause interference whereas more distant cells can use the same frequencies. Reuse expands the capacity of a cellular network by enabling the use of the same channels throughout the network

RP
Radio Part

RNC
Radio Network Controller; the element which controls the Node Bs within a UMTS network. It is roughly analogous to a BSC in a GSM network

Roaming
A service unique to GSM which enables a subscriber to make and receive calls when outside the service area of his home network e.g. when travelling abroad

Router
A device which forwards information in a network on a connectionless basis

RRM
Radio Resource Management, part of the UMTS infrastructure

RT
Remote Terminal

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذا الرابط]
SACCH
Slow Associated Control Channel; transmits continuous measurements in parallel with operation of TCH or SDCCH; needed for handover decisions

SAR
Specific Absorption Rate

SB
Synchronisation Burst; used for time synchronisation of the mobile

S-CDMA
Synchronous CDMA (see CDMA)

SCH
Synchronisation Channel; downlink only frame synchronisation and identification of base station

SCP
Switching/Service Control Point

SDCCH
Stand-alone Dedicated Control Channel; communications channel between the MS and the BTS. Used for signalling during call set-up before a TCH is allocated

SDLC
Synchronous Data Link Control

SDMA
Spatial Division Multiple Access

SGSN
Serving GPRS Support Node; the gateway between the RNC and the core network in a GPRS/UMTS network

SIM
Subscriber Identity Module; A smart card containing the telephone number of the subscriber, encoded network identification details, the PIN and other user data such as the phone book. A user’s SIM card can be moved from phone to phone as it contains all the key information required to activate the phone

SoHo
Small Office/Home Office

Streaming
An Internet derived expression for the one-way transmission of video and audio content

STK
SIM ToolKit: specified within the GSM standard, this allows operators to add additional functions to the phone menu in order to provide new services such as mobile banking or email

SMR
Specialised Mobile Radio; the US term for private mobile radio (See PMR)

SMS
Short Message Service; a text message service which enables users to send short messages (160 characters) to other users. A very popular service, particularly amongst young people, with 400 billion SMS messages sent worldwide in 2002

SMSC
SMS Centre-the network entity which switches SMS traffic

SMSCB
SMS Cell Broadcast

SMS-MO
SMS Mobile Originated

SMS-MT
SMS Mobile Terminated

SMS-PP
SMS Point to Point

SP
Service Provider

SQAM
Staggered Quadrature Amplitude Modulation

SQPSK
Staggered Quadrature Phase Shift Keying

SS
Supplementary Service Support; handles special services

SS7
Signalling System Number 7 (See CCS7)

SSP
Service Switching Point

STM
Synchronous Transfer Mode

Symbian
A company created by Psion, Nokia, Ericsson and Motorola in 1998 with the aim of developing and standardising an operating system which enable mobile phones from different manufacturers to exchange information
The operating system is known as EPOC. Matsushita has subsequently joined Symbian

موضوع: رد: مختصرات 4 _GSM الأحد أغسطس 31, 2008 6:52 pm

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