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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 color palette to 16 or 256 colors. 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.

191 Terms and definitions