The CCIR, CONSIDERING that Recommendation 645 defines three test signals to be used on international sound-programme connections; that no level information can be derived from a single-level test signal concerning its relationship to the levels defined in Recommendation 645.
ITU-T J.27 SPANISH-1990 history
1990ITU-T J.27 SPANISH-1990 SIGNALS FOR THE ALIGNMENT OF INTERNATIONAL SOUND-PROGRAMME CONNECTIONS