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The term information system has the following meanings:
2. Any telecommunications and/or computer related equipment or interconnected system or subsystems of equipment that is used in the acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception of voice and/or data, and includes software, firmware, and hardware
The simplest model that describes the Structure and Behaviour of an Information System takes five objects:
- Repositories, hold data permanent or temporarily, such as buffers, RAM, hard disks, cache, etc.
- Interfaces, exchange information with the non-digital world, such as keyboards, speakers, scanners, printers, etc.
- Channels, connect repositories, such as buses, cables, wireless links, etc. A Network is a set of logical or physical channels.
- Services; provide value to users or to other services via messages interchange.
- Messages; carries a meaning to users or services.
Source: from book "Seguridad de la Informacion", 2004 ISBN 84-933336-7-0