Date of Last Update : 16 May 1995 List of ITU-T O-Series Recommendations in force ** - Series O * Specifications for measuring equipment - General O.1 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Scope and application of Series O Recommendations O.3 (10/92) [Rev.1] [4 pp.] [Publ.: Jul.93] Climatic conditions and relevant tests for measuring equipment O.6 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] 1020 Hz reference test frequency O.9 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Measuring arrangements to assess the degree of unbalance about earth * Maintenance access O.11 (10/92) [Rev.1] [7 pp.] [Publ.: Jul.93] Maintenance access lines * Automatic and semi-automatic measuring systems O.22 (10/92) [Rev.1] [32 pp.] [Publ.: Oct.93] CCITT automatic transmission measuring and signalling testing equipment ATME No. 2 O.27 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] In-station echo canceller test equipment O.33 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Automatic equipment for rapidly measuring stereophonic pairs and monophonic sound-programme circuits, links and connections * Equipment for the measurement of analogue parameters O.41 (10/94) [Rev.2] [Publ. sched.: Jun.95] Psophometer for use on telephone-type circuits Note - C: 64/91/107 O.42 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Equipment to measure non-linear distortion using the 4-tone intermodulation method O.61 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Simple equipment to measure interruptions on telephone-type circuits O.62 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Sophisticated equipment to measure interruptions on telephone-type circuits O.71 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Impulsive noise measuring equipment for telephone-type circuits Note - Same as H.13 O.72 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Characteristics of an impulsive noise measuring instrument for wideband data transmissions Note - Same as H.16 O.81 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Group-delay measuring equipment for telephone-type circuits O.82 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Group-delay measuring equipment for the range 5 to 600 kHz O.91 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Phase jitter measuring equipment for telephone-type circuits O.95 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Phase and amplitude hit counters for telephone-type circuits O.111 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Frequency shift measuring equipment for use on carrier channels * Equipment for the measurement of digital and analogue/digital parameters O.131 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Quantizing distortion measuring equipment using a pseudo-random noise test signal O.132 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Quantizing distortion measuring equipment using a sinusoidal test signal O.133 (1993) [Rev.1] [26 pp.] [Publ.: Sep.94] Equipment for measuring the performance of PCM encoders and decoders O.150 (10/92) [New] [5 pp.] [Publ.: Jun.93] Digital test patterns for performance measurements on digital transmission equipment O.151 (10/92) [Rev.1] [5 pp.] [Publ.: Jul.93] Error performance measuring equipment operating at the primary rate and above O.152 (10/92) [Rev.1] [4 pp.] [Publ.: Jun.93] Error performance measuring equipment for bit rates of 64 kbit/s and N x 64 kbit/s O.153 (10/92) [Rev.1] [6 pp.] [Publ.: Jun.93] Basic parameters for the measurement of error performance at bit rates below the primary rate O.161 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] In-service code violation monitors for digital systems O.162 (10/92) [Rev.1] [7 pp.] [Publ.: Aug.93] Equipment to perform in-service monitoring on 2048, 8448, 34 368 and 139 264 kbit/s signals O.163 (1988) [Blue Book Fasc. IV.4] [Publ.: Jul.90] Equipment to perform in-service monitoring on 1544 kbit/s signals O.171 (10/92) [Rev.1] [10 pp.] [Publ.: Aug.93] Timing jitter measuring equipment for digital systems ---------------------------------------------------------------------- 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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