After the connection of the various circuits to form the international sound-programme link (conforming to the level diagrams of these circuits) it is necessary to verify, by means of an automatic measuring equipment (see Recommendations O.31 [1], O.32 [2] and O.33 [3]) or by measurements at individual frequencies, that the received level at the distant incoming terminal ISPC is at the correct value (see Recommendation N.10).
ITU-T N.12 FRENCH-1988 Referenced Document
ITU-T O.31 Automatic Measuring Equipment for Sound-Programme Circuits - Specifications for Measuring Equipment (Study Group IV; 8 pp; Cancelled)*， 1989-01-01 Update
ITU-T O.32 Automatic Measuring Equipment for Stereophonic Pairs of Sound-Programme Circuits - Specifications for Measuring Equipment (Study Group IV; 11 pp; Cancelled)*， 1989-01-01 Update
ITU-T O.33 Automatic Equipment for Rapidly Measuring Stereophonic Pairs and Monophonic Sound-Programme Circuits Links and Connections - Specifications for Measuring Equipment Study Group 4; 15 pp*， 1995-01-01 Update
ITU-T N.12 FRENCH-1988 history
1988ITU-T N.12 FRENCH-1988 MEASUREMENTS TO BE MADE DURING THE LINE - UP PERIOD THAT PRECEDES A SOUND - PROGRAMME TRANSMISSION