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i121sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : I.121
Title : Broadband aspects of ISDN
Study Group : XVIII - ISDN
Version : Revised
Date of adoption : 1991
Notes :
Recommendation I.121states the basic principles of broadband aspects
of integrated services digital network (B-ISDN) and indicates further
developments of the ISDN network capabilities in order to support more
advanced services and applications.
The B-ISDN Recommendations were written taking into account the
following:
- the emerging demand for broadband services;
- the availability of high speed transmission, switching and
signal processing technologies;
- the improved data and image processing capabilities
available to the user;
- the advances in software application processing in the
computer and telecommunication industries;
- the need to integrate both interactive and distribution
services;
- the need to integrate both circuit and packet transfer mode
into one universal broadband network;
- the need to provide flexibility in satisfying the
requirements of both user and operator;
- the need to cover broadband aspects of ISDN in CCITT
Recommendations.
The main feature of the ISDN concept is the support of a wide range of
audio, video and data applications in the same network. A key element
of service integration for an ISDN is the provision of a wide range of
services to a broad variety of users utilizing a limited set of
connection types and multipurpose user/network interfaces.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).