From today's networks to broadband ISDN

Growing demands

(Despite|In spite of) the enormous capacity of the world-wide telecommunications networks with about 420 million main stations and (despite|in spite of) further speciali(s|z)ed networks by far not all of (today's|the present and future) requirements and wishes of the users and providers of telecommunications services (are fulfilled|have been fulfilled).

(Apart from|In addition to|Besides) the improvements and (extensions|supplements| completions) of existing services - more comfortable performance (characteristics|specs|features) for the [tele]phoning, shorter transmission times for telexing, (higher|improved|better) resolution for [tele]faxing - (users demand|there are demands) for further (functions|features), e.g. mail-box for speech, texts and images and for new broad band services such as:

• transmission of moving images for telephoning and video conferencing - at least in the quality known from TV,
• image transmission with higher resolution for professional applications and (substantial| significantly|clearly) better quality for (TV|television) images - comparable (with|to) the possible effect in cinema [.. cinema effects] (high-definition television, HDTV)
• rapid exchange of documents and data, e.g. for the coupling of local area networks (LANs)
• selective retrieval of information being stored in the form of data, graphics, images, films or documentations ("broadband-interactive videotext", "document retrieval"),
• Easy access to information processing for (scheduling|planning), accounting, ordering, cash transferring, computing and designing ("plug-in computer features").

The demand for such broad band services (to some extent|partly|in part) even exists today, (to some extent|in part) originates with the further development of networks, storage systems, computers and terminal equipments - and with falling costs and fees.

Infrastructure and "open communication"

In order to (satisfy|meet|fulfil) (present|today's) demand and future needs for information- and communications services, (an appropriate|a suitable) infrastructure is (required|necessary):

• a wide (spectrum|variety) of comprehensive, need-oriented and (cost-effective|inexpensive| price-worthy|cost-saving) services (shall be at hand for|should be offered to) a large (group|community) of users - private participants, (companies|enterprises|corporations |businesses), authorities and administrations.

• The (fundamentals|alpha and omega|basis) for individual solutions of special problems (should|shall) be offered to professional (subscribers|users).

"Open communications" is the (precondition|prerequisite|(fundamental|basic) condition) for (smooth|easy|unproblematic|problem-free) (world-wide|global) telecommunications. The public telephone (system|network) - being the "largest machine of the world" - is the most well-known example for (it|this|that). In contrary to today still frequently common, non-compatible (island|single) solutions it is a must for the new services that open communications (become|are) (implemented|put into practice|reali(s|z)ed) (In contrary to ... still usual today). Connected with the (increasing|rising) use of personal computers capable of communicating, workstations and multifunctional (terminal equipment|terminals) this is an important prerequisite for the (broad|wide-spread|extended|extensive) use powerful services.

pictures:

development of telecommunication networks and -services

Service integrating digital wideband network (broadband ISDN)

Service integrating digital network (broadband ISDN)

Integrated text and data network (IDN)

Telephone network

Cable broadcasting station

(large) shared installation

Image television

Telephone

telefaxing

Telex, teletext, (office-telegraphy)

Data transferring

interactive videotext

broadband-interactive videotext

cabletext

Videotext

television

radio-broadcast

dialogue

call

distributing

network of the future: broadband ISDN for all services

(power connection|terminal knot)

optical fibre

information center

(switching center|headquarters)