The CCIR considering: (a) that the hypothetical reference circuit is intended as a guide to designers and constructors of actual systems;(b) that the costs of establishing and maintaining systems in the fixed-satellite service are critically dependent on the video bandwidth and the overall signal-to-noise ratio to be provided and these should, therefore, not be greater than is strictly necessary for acceptable transmission;(c) that it is desirable for the noise level in satellite transmission not to exceed the permissible level for international terrestrial transmissions (see Recommendation 567);(d) that it is desirable for international television programmes via space stations in the fixed-satellite service to be transmitted according to the television standards and system of origin, so as to ensure the best quality of service in conformity with Opinion 38.
ITU-R S.354-2 SPANISH-1974 history
1974ITU-R S.354-2 FRENCH-1974 Video bandwidth and permissible noise level in the hypothetical reference circuit for the fixed-satellite service