Question 17/XVIII - ISDN protocol reference model

Considering

(a) that CCITT Recommendation I.320 defines principles for modelling
information flows in various ISDN configurations;

(b) that there is a continuing need to model ISDN capabilities within a
common framework or reference model which will facilitate the further
development of ISDN protocols and associated architectures;

the following should be studied:

1. What further methods of modelling and categorizing information flows
and the corresponding layer service definitions in various ISDN
configurations are required in Recommendation I.320 taking account of
the needs of broadband services, improved (64 kbit/s) ISDN services new
transfer modes, mobile services, interfaces to private networks,
management and control functions, intelligent network services,
universal personal telecommunications services and broadcast and
multipoint modes of operation?

2. What further development of Recommendation I.320 is required?

Note - In developing Recommendation I.320 account has been taken of the
OSI layered model. In the further development of both the ISDN protocol
reference model and the OSI layered model the continuing need for close
alignment of the models is recognized. Studies should therefore be
coordinated with Study Group VII and ISO.