Understanding Mobile Terms - Part 3

in Mobile Help

DSP
Digital Signal Processing

DSRR
Digital Short Range Radio; a UK standard for a low power, short range radio system designed for small voice and data networks

DTE
Data Terminal Equipment

DTMF
Dual Tone Multi Frequency; better know as Touch Tone. The tones generated by touching the keys on the phone are used for a variety of purposes including voice mail systems and voice messaging

DTX
Discontinuous Transmission

Dual Band
The capability of GSM infrastructure elements and handsets to work across both the 900MHz and 1800MHz bands. The capability to seamlessly handover between the two bands offers operators major capacity gains

DB
Dummy Burst; transmitted as a filler in unused timeslots of the carrier

Duplex
The wireless technique where one frequency band is used for traffic from the network to the subscriber (the downlink) and another, widely separated, band is used for traffic from the subscriber to the network (the uplink)

EDGE
Enhanced Data rates for GSM Evolution; effectively the final stage in the evolution of the GSM standard, EDGE uses a new modulation schema to enable theoretical data speeds of up to 384kbit/s within the existing GSM spectrum. An alternative upgrade path towards 3G services for operators, such as those in the USA, without access to new spectrum. Also known as Enhanced GPRS (E-GPRS)

EEPROM
Electrically Erasable Programmable Read Only Memory

EFR
Enhanced Full Rate; a alternative voice codec that provides improved voice quality in a GSM network (see codec)

EFT
Electronic Funds Transfer

EGSM
Extended (frequency range) GSM

EIR
Equipment Identity Register; a database that contains a list of all valid mobile stations within a network based on their IMEI

EIRP
Effective Isotropic Radiated Power

EPOC
The mobile phone operating system developed by Symbian. Derived from epoch-the beginning of an era-EPOC is a 32-bit operating environment which comprises a suite of applications, customisable user interfaces, connectivity options and a range of development tools

EPROM
Erasable Programmable Read Only Memory

Erlang
A dimensionless unit of average traffic density in a telecommunications network

ERMES
Enhanced Radio Messaging System; a paging technology developed by ETSI which was intended to allow users to roam throughout Europe. Adopted by a number of European and Middle Eastern countries, ERMES, like paging in general, was overtaken by the ubiquity of GSM

ERO
European Radio communications Office

ERP
Effective Radiated Power

ESMR
Enhanced Special Mobile Radio; a US PMR variant (see SMR)

ESN
Electronic Serial Number; a 32-bit number that uniquely identifies a mobile phone

ESPRIT
European Strategic Programme for Research and Development in Information Technology

ETACS
Extended TACS; the extension of TACS by the addition of new frequencies

ETS
European Telecommunications Standard

ETSI
European Telecommunications Standards Institute: The European group responsible for defining telecommunications standards

FACCH
Fast Associated Control Channel; similar to the SDCCH but used in parallel for operation of the TCH. If the data rate of the SACCH is insufficient borrowing mode is used

FB
Frequency Correction Burst; used for frequency synchronisation of the mobile

FCC
Federal Communications Commission; the US regulatory body for telecommunications

FCCH
Frequency Correction Channel; downlink only, correction of MS frequencies, transmission of frequency standard to MS etc.

FDD
Frequency Division Duplex; a radio technique which uses paired spectrum; UMTS has an FDD element

FDMA
Frequency Division Multiple Access-a transmission technique where the assigned frequency band for a network is divided into sub-bands which are allocated to a subscriber for the duration of their calls

FEC
Forward Error Correction

FH
Frequency Hopping

FH-CDMA
Frequency Hopping CDMA

FMC
Fixed Mobile Convergence

FMI
Fixed Mobile Integration

FPLMTS
Future Public Land Mobile Telecommunications System, the original title of the ITU’s third generation concept now known as IMT-2000

FRA
Fixed Radio Access; see WLL

FSDPSK
Filtered Symmetric Differential Phase Shift Keying

FSK
Frequency Shift Keying; a method of using frequency modulation to send digital information

FSOQ
Frequency Shift Offset Quadrature Modulation

FSS
Fixed Satellite Service
The interface between the PCU and the SGSN in a GSM/GPRS network

Gc
The interface between the GGSN and the HLR in a GSM/GPRS network