Question 13/XVIII - Network capabilities for the support of broadband
services in ISDNs

Considering

(a) that Recommendation I.121 provides the framework for the support of
broadband services in an ISDN and that a status report (annexed to
relevant Questions) has been prepared on broadband ISDN;

(b) that Study Group I is defining services;

(c) most kinds of information-related activity involves a mixture of
multi-media requirements;

(d) ISDN will incorporate both broadband and 64 kbit/s based
capabilities;

(e) that Study Group XVIII will consider broadband services and will
support Study Group I by giving advice on the network capabilities
available for the provision of broadband services in ISDNs;

(f) other Study Groups may initiate studies on specific aspects of
broadband ISDN with Study Group XVIII giving guidance for their work;

(g) that strong coordination of activities in the broadband field will
still be necessary early in this study period, at least until there is a
consensus on a number of basic assumptions and parameters;

the following should be studied:

1. What new and/or revised Recommendations and what guidance to other
Study Groups is required concerning network capabilities for the support
of broadband services in ISDNs?

Note 1 - The study will include the following, e.g.:

1.bit rates for services;

2.multipoint and broadcast operation and multimedia applications;

3.description of broadband services and network capabilities using the
methodology contained in Recommendation I.130;

4.signalling and control functions;

5.numbering;

6.maintenance;

7.user-network interface capabilities.

2. What network capabilities are needed in ISDN during the evolutionary
period from 64 kbit/s based networks to networks with broadband
capabilities?

3. What are the implications on network functions (interfaces,
signalling procedures, protocol definitions, etc.) for offering
simultaneous, mixed-media capabilities in a broadband ISDN environment?

Note 2 - Under this Question general guiding principles for the work of
broadband aspects of ISDN should be further established.

Note 3 - The study should be conducted in close relation to Question
2/XVIII.