 Assemblies. With the agreement of the Technical Assem- bly they may also take part in Technical Committees. Non European RES, Radio Equipment and Systems, which looks into basic organisations concerned with telecommunications may also be in- standards for radio equipment, mobile systems, land, maritime vited to participate as observers, and this is usually done where and public aeronautical, and the harmonisation of measurement reciprocal arrangements exist within their countries. Observers standards for mobile radio. It is responsible for developing from Australia, New Zealand, Canada and the USA have taken part. standards for digital cordless telephony (DECT). It is this diverse range of membership which is the prime strength GSM, Special Mobile Group, which has responsibility for of ETSI, since it ensures a healthy interchange of views. developing technical standards for the pan-European digital In April 1991 there were 269 members of ETSI, of which manu- cellular system in the 900MHz band, and for standards on type facturers accounted for 63%, public network operators 14%, na- approval and security aspects. tional administrations 10% and users/service providers 13%. PS, Paging Systems, which is responsible for the technical Twenty three countries were represented, from the EC and EFTA, aspects of new paging systems, such as the European system Turkey, Malta, Cyprus, Czechoslovakia and Poland. The largest ERMES. number of members were from the UK (71), France (45) and SES, Satellite Earth Stations, covering applications and ser- Germany (36). There were 400 draft standards in preparation by the vices, including mobile, for earth station equipment and for twelve technical committees and 110 standards had been sent for protocols involved in the interchange of information with sat- public enquiry. The target at that time was sixty days for producing ellites. a standard. NA, Network Aspects, covering network architecture, user interface service and charging, numbering and addressing, audio-visual services, broadb