| List of ITU-T O-Series Recommendations in force | |
| [O.1] Recommendation O.1 (05/96) - Scope and Application of Measurement Equipment Specifications covered in the O-series Recommendations | 20 CHF |
| Summary of Recommendation O.1 (05/96) | |
| [O.3] Recommendation O.3 (10/92) - Climatic conditions and relevant tests for measuring equipment | 20 CHF |
| [O.6] Recommendation O.6 (11/88) - 1020 Hz reference test frequency | 20 CHF |
| [O.9] Recommendation O.9 (11/88) - Measuring arrangements to assess the degree of unbalance about earth | 20 CHF |
| [O.11] Recommendation O.11 (10/92) - Maintenance access lines | 20 CHF |
| [O.22] Recommendation O.22 (10/92) - CCITT Automatic transmission measuring and signalling testing equipment ATME No. 2 | 20 CHF |
| [O.27] Recommendation O.27 (11/88) - In-station echo canceller test equipment | 20 CHF |
| [O.33] Recommendation O.33 (07/95) - Automatic equipment for rapidly measuring stereophonic pairs and monophonic sound-programme circuits, links and connections | 20 CHF |
| [O.41] Recommendation O.41 (10/94) - Psophometer for use on telephone-type circuits | 20 CHF |
| Summary of Recommendation O.41 (10/94) | |
| [O.42] Recommendation O.42 (11/88) - Equipment to measure nonlinear distortion using the 4-tone intermodulation method | 20 CHF |
| [O.61] Recommendation O.61 (11/88) - Simple equipment to measure interruptions on telephone-type circuits | 20 CHF |
| [O.62] Recommendation O.62 (11/88) - Sophisticated equipment to measure interruptions on telephone-type circuits | 20 CHF |
| [O.71] Recommendation O.71 (11/88) - Impulsive noise measuring equipment for telephone-type circuits | 20 CHF |
| [O.72] Rec. O.72 (see/voir/véase Rec. H.16) | |
| [O.81] Recommendation O.81 (11/88) - Group-delay measuring equipment for telephone-type circuits | 20 CHF |
| [O.82] Recommendation O.82 (11/88) - Group-delay measuring equipment for the range 5 to 600 kHz | 20 CHF |
| [O.91] Recommendation O.91 (11/88) - Phase jitter measuring equipment for telephone-type circuits | 20 CHF |
| [O.95] Recommendation O.95 (11/88) - Phase and amplitude hit counters for telephone-type circuits | 20 CHF |
| [O.111] Recommendation O.111 (11/88) - Frequency shift measuring equipment for use on carrier channels | 20 CHF |
| [O.131] Recommendation O.131 (11/88) - Quantizing distortion measuring equipment using a pseudo-random noise test signal | 20 CHF |
| [O.132] Recommendation O.132 (11/88) - Quantizing distortion measuring equipment using a sinusoidal test signal | 20 CHF |
| [O.133] Recommendation O.133 (03/93) - Equipment for measuring the performance of PCM encoders and decoders | 20 CHF |
| Summary of Recommendation O.133 (03/93) | |
| [O.150] Recommendation O.150 (05/96) - General requirements for instrumentation for performance measurements on digital transmission equipment | 20 CHF |
| Summary of Recommendation O.150 (05/96) | |
| [O.151] Recommendation O.151 (10/92) - Error performance measuring equipment operating at the primary rate and above | 20 CHF |
| [O.152] Recommendation O.152 (10/92) - Error performance measuring equipment for bit rates of 64 kbit/s and N x 64 kbit/s | 20 CHF |
| [O.153] Recommendation O.153 (10/92) - Basic parameters for the measurement of error performance at bit rates below the primary rate | 20 CHF |
| [O.161] Recommendation O.161 (11/88) - In-service code violation monitors for digital systems | 20 CHF |
| [O.162] Recommendation O.162 (10/92) - Equipment to perform in-service monitoring on 2048, 8448, 34 368 and 139 264 kbit/s signals | 20 CHF |
| [O.163] Recommendation O.163 (11/88) - Equipment to perform in-service monitoring on 1544 kbit/s signals | 20 CHF |
| [O.171] Recommendation O.171 (04/97) - Timing jitter and wander measuring equipment for digital systems which are based on the plesiochronous digital hierarchy (PDH) | 20 CHF |
| Summary of Recommendation O.171 (04/97) | |
| [O.181] Recommendation O.181 (05/96) - Equipment to assess error performance on STM-N interfaces | 22 CHF |
| Summary of Recommendation O.181 (05/96) | |
| [O.191] Recommendation O.191 (04/97) - Equipment to assess ATM layer cell transfer performance | 22 CHF |
| Table of Contents of Recommendation O.191 (04/97) | |
| [O.191 add.1] Addendum 1 to Recommendation O.191 (10/97) - Equipment to assess ATM layer cell transfer performance Addendum 1: Annex D - Measurement of error and availability parameters in the Out-of-Service Mode | 20 CHF |
| Table of Contents and Summary of Addendum 1 to Recommendation O.191 (10/97) | |
