| ANSI |
American national standards
institute |
| ARPA |
Advanced research projects
agency |
| CCITT |
Comité consultatif international
pour le téléphone et les télécommunications
Consultative committee on international telephone
and telegraphy |
| CERN |
Conseil européen pour la recherche
nucléaire
Comitato europeo per le ricerche nucleari |
| ETSI |
European telecommunications standard
institute |
| IEC |
International electrotechnical commission |
| IEEE |
Institute of electrical and electronics
engineers |
| ISO |
International organization for standardization |