4. Mobile network services
In the 1980s, a group of European experts defined a digital cellular network capable of accommodating several million users (GSM). The specifications produced by this group are public and managed by ETSI.
GSM services can be divided into two groups: voice services and data services (text, image, fax and file transmission). Data transmission can be synchronous or asynchronous, and transparent or non-transparent.
In transparent mode, the link is managed entirely by the terminals, with no end-to-end control.
In the non-transparent mode, more suitable for asynchronous transfers, network equipment performs certain functions, such as error correction, on network sections, without terminal intervention. It uses the Radio Link Protocol...
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Mobile network services
Integrated Services Digital Network (ISDN) services
Bibliography
Reference
Standards bodies
Union International de Télécommunication (UIT) (International Telecommunication Union) http://www.itu.int/home/index-fr.html
French Standards Agency (AFNOR) http://www.afnor.fr/
European Telecommunications Standards Institute...
Websites
Sites where norms and standards can be obtained :
AFNOR http://www.afnor.fr
ETSI http://www.etsi.org
ISO...
Standards and norms
(Any comments are italicized in brackets).
International Standard Institute (ISO)
- Technologies de l'information. Jeux de caractères graphiques codés sur un seul octet. Partie 1 : alphabet latin n 1 - ISO/IEC 8859-1 - 1998
- Technologies de l'information. Représentation codée des images et du son. Compression progressive des images en deux tons - ISO/IEC 11544 - 1993
- Technologies...
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