ISO - International Organization for Standardization (ISO) (http://www.iso.org)

 IEC/CEI – International Electrotechnical Commission (IEC) (http://www.iec.ch)

  European Committee for Standardization (http://www.cenorm.be/cenorm/index.htm)

   European Committee for Electrotechnical Standardization (CENELEC) (http://www.cenelec.org/Cenelec/Homepage.htm)

   European Telecommunications Standards Institute (ETSI)  (http://www.etsi.org)

  International Telecommunication Union (ITU) (http://www.itu.int/home/index.html)

  InternationalOrganization of Legal Metrology (OIML) (http://www.oiml.org)