Question 20/I - International multi-destination telecommunication
services via  satellite (revised, continuation of Question 20/I, 1985-
1988)

Considering

(a) the progress achieved by the CCITT in studying point-to- multipoint
telecommunications service via satellite;

(b) the availability of satellites for other multidestinational
services;

(c) user requirements for additional multidestination services (e.g.
multipoint-to-point, two-way multiple access);

(d) the availability of earth stations to provide these services;

(e) the need to define the Quality of Service for these services;

(f) the need by administrations to develop operational guidelines for
these services,

What new Recommendations for international multidestination
telecommunication services via satellite are required?

Possible points of study are:

1. updating of Recommendation F.140 in the light of operational
experience for point-to-multipoint service;

2. extending Recommendation F.140 or developing additional
Recommendations to cover new services:

-operational procedures for multipoint-to-point service (see Figure 1
for
an illustration of this service);

-operational procedures for two-way multiple access service (see
Figure 2 for an illustration of this service);

- Quality of Service requirements for these services

FIGURE 1

Multipoint-to-point service

FIGURE 2

Two-way multiple-access service