ITU-T D.4

This Recommendation details the provisions applicable to leased international (continental and intercontinental) sound- and television-programme circuits and associated control circuits for private service. The provisions of this Recommendation should be applied in conjunction with ITU-T Rec. D.1, except where specifically stated otherwise. Sound- and television-programme circuits provided on an occasional basis are subject to the provisions of ITU-T Rec. D.180. Provisions governing the technical aspects and maintenance of sound- and television-programme circuits are contained in the J-, M-, and N-series Recommendations.