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Terms and definitions 189
Preliminary Layla850 P1B
CSS
Cascading Style Sheet. A feature of browsers.
DTMF
Dual Tone Multi Frequency. A method of coding digits as a
combination of two audible tones.
DUN
Dial-Up Networking. The dial-up networking capability in
Windows.
EMS
Enhanced Messaging Service. An extension of SMS enabling
pictures, animations, sound and text formatting to be added to
text messages.
FCC
Federal Communications Commission. US government agency
which regulates radio communications.
GIF
Graphics Interchange Format. Format for storing images which
also supports animated images. Highly compressed by limiting
the colour palette to 16 or 256 colours. It is one of the two most
common file formats for graphic images on the World Wide
Web. The other is JPEG.
GPRS
General Packet Radio Services. A radio technology for GSM
networks that adds packet-switching protocols, shorter setup
time for ISP connections, and offers the possibility of charging
by the amount of data sent rather than by connection time.
GPRS promises to support flexible data transmission rates
typically up to 20 or 30 kbps (with a theoretical maximum of
171.2 kbps), as well as continuous connection to the network.
GSM
Global System for Mobile Communications. GSM is the world's
most widely-used digital mobile phone system, now operating
in over 160 countries around the world.
GSM 850
The GSM system family includes GSM 850, GSM 900, GSM
1800 and GSM 1900. GSM 850 refers to GSM working on a
frequency of 850 MHz.
GSM 1800
Also known as DCS 1800 or PCN, this is a GSM digital network
working on a frequency of 1800 MHz. It is used in Europe and
Asia-Pacific.
GSM 1900
Also known as PCS. Refers to a GSM system running in the
1900 MHz band. Used in the USA and Canada, for instance.