Global System for Mobile Communication - A well defined radio system that is deployed in almost all parts of the world. The GSM system continues to evolve into 3rd generation (multimedia) and 4th generation (broadband wireless) systems.

GSM Services - The services available on GSM networks include voice, messaging, data, position location, and others.

GSM Products (Mobile Devices) - Mobile devices convert radio signals into other forms that can be used. There are several types of GSM devices which include mobile telephones, data adapter cards, and embedded radio modules.

GSM Radio - GSM radio system is the radio parameters (such as frequency and bandwidth), the structure of how data is transferred on the radio channel (frames, fields, and modulation).

Digital Audio and Baseband - The processing of the information or media into a format that can be transmitted on GSM channels.

Radio Channels - The structure, frequencies, modulation types, and other RF characteristics of the GSM system.

Logical Channels - The logical control and data channels that share the physical transmission channel.

GSM Network - The functional parts of the GSM system which include the Mobile Station (MS), Base Station, Mobile Switching Centre (MSC), and Service Nodes.

GSM System Operation - How the GSM system coordinates access and provides services to devices and users.

GSM Evolution - How the system parts and services have evolved over time.