Whereas the present networks, which include existing ISDN, are evolving towards becoming advanced networks offering a variable data flow rate up to broadband capabilities, adaptable to different needs, in particular to the provision of multimedia services and applications;
ker se sedanja omrežja, ki vključujejo obstoječe digitalno omrežje z integriranimi storitvami (ISDN), razvijajo v izpopolnjena omrežja s spremenljivo hitrostjo prenosa podatkov do širokopasovnih zmogljivosti, ki se lahko prilagajajo različnim potrebam, zlasti pa zagotavljanju multimedijskih storitev in aplikacij;