Date of Last Update : 16 May 1995 List of ITU-T N-Series Recommendations in force ** - Series N * International sound-programme transmission N.1 (1993) [Rev.1] [8 pp.] [Publ.: Nov.94] Definitions for application to international sound-programme and television-sound transmission N.2 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Different types of sound-programme circuit N.3 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Control circuits N.4 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Definition and duration of the line-up period and the preparatory period N.5 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Sound-programme control, sub-control and send reference stations N.10 (1993) [Rev.1] [6 pp.] [Publ.: Jan.94] Limits for the lining-up of international sound-programme links and connections N.11 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Essential transmission performance objectives for international sound-programme centres (ISPC) N.12 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Measurements to be made during the line-up period that precedes a sound-programme transmission N.13 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Measurements to be made by the broadcasting organizations during the preparatory period N.15 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Maximum permissible power during an international sound-programme transmission N.16 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Identification signal N.17 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Monitoring the transmission N.18 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Monitoring for charging purposes, releasing N.21 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Limits and procedures for the lining-up of a sound-programme circuit N.23 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Maintenance measurements to be made on international sound-programme circuits * International television transmission N.51 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Definitions for application to international television transmissions N.52 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Multiple destination television transmissions and coordination centres N.54 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Definition and duration of the line-up period and the preparatory period N.55 (1993) [Rev.1] [7 pp.] [Publ.: Sep.94] Organization, responsibilities and functions of control and sub-control international television centres and control and sub-control stations for international television connections, links, circuits and circuit sections N.60 (1993) [Rev.1] [3 pp.] [Publ.: Mar.94] Nominal amplitude of video signals at video interconnection points N.61 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Measurements to be made before the line-up period that precedes a television transmission N.62 (1993) [Rev.1] [5 pp.] [Publ.: Mar.94] Tests to be made during the line-up period that precedes a television transmission N.63 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Test signals to be used by the broadcasting organizations during the preparatory period N.64 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Quality and impairment assessment N.67 (1993) [Rev.1] [12 pp.] [Publ.: Mar.94] Monitoring television transmissions - Use of the field blanking interval N.73 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Maintenance of permanent international television circuits, links and connections * International videoconference transmission N.81 (1988) [Blue Book Fasc. IV.3] [Publ.: May.90] Definition for application to international videoconference transmissions N.86 (1993) [Rev.1] [7 pp.] [Publ.: Mar.94] Line-up and service commissioning of international videoconference systems operating at transmission bit rates of 1544 and 2048 kbit/s N.90 (1993) [Rev.1] [4 pp.] [Publ.: Mar.94] Maintenance of international videoconference systems operating at transmission bit rates of 1544 and 2048 kbit/s ---------------------------------------------------------------------- Some 1120 Recommendations from the Blue Book are still in force. They are included in fascicles and volumes of the Blue Book that may still be purchased from the ITU Sales Service. Since the beginning of the 1988-1993 Study Period ("post Blue Book") ITU-T Recommendations are published and offered for sale individually (in separate fascicles). 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