Question 17/II - Traffic reference models for ISDN traffic engineering
(continuation of Question 31/II, amended, of the 19851988 study
period)

Considering

(a) that ISDN will evolve from digital telephone network and will
include
various non-voice and value-added services;

(b) that ISDN will make use of standard access interfaces, layered
network architecture and different connection types;

(c) that users can generate, through a top down process, traffic for the
resources associated with each layer in the layered network
architecture;

(d) that user packets and user-to-user signals as well as call control
messages are offered to D-channel;
(e) that the evolution towards additional packet mode and broadband
ISDN services will require new traffic modelling studies;

(f) that new GOS objectives should be pursued for ISDNs taking into
account the close interrelation of various network performance and
Quality of Service factor in ISDN;

(g) that in the E.700-Series a basic structure of ISDN traffic
Recommendation has been established together with some basic
reference models,

1. What new and revised Recommendations are needed for basic traffic
models (E.700 and E.710-Series) and GOS requirements (E.720-Series)?

2. What new Recommendations are needed for traffic dimensioning
methods (E.730-Series) especially D-channel traffic capacity.

Note - Studies under this Question will include the possible use of SDL
as a working tool. Liaison will be maintained with Study Group X
(Working Party X/3).