O.1
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Scope and application of measurement equipment specifications covered in the O-series Recommendations
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O.3
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Climatic conditions and relevant tests for measuring equipment
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O.6
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1020 Hz reference test frequency
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O.9
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Measuring arrangements to assess the degree of unbalance about earth
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O.11
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Maintenance access lines
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O.22
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CCITT automatic transmission measuring and signalling testing equipment ATME No. 2
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O.25
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[Withdrawn] Semiautomatic in-circuit echo suppressor testing system (ESTS)
Deleted after its content became technically out of date
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O.27
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In-station echo canceller test equipment
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O.31
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[Withdrawn] Automatic measuring equipment for sound-programme circuits
Deleted after its content became technically out of date
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O.32
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[Withdrawn] Automatic measuring equipment for stereophonic pairs of sound-programme circuits
Deleted after its content became technically out of date
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O.33
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Automatic equipment for rapidly measuring stereophonic pairs and monophonic sound-programme circuits, links and connections
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O.41
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Psophometer for use on telephone-type circuits
This Recommendation is also included but not published in P series under alias number P.53
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O.42
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Equipment to measure non-linear distortion using the 4-tone intermodulation method
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O.51
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[Withdrawn] Volume meters
O.51 was an alias name of ITU-T P.52. Only this alias name was suppressed. ITU-T P.52 remains valid
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O.61
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Simple equipment to measure interruptions on telephone-type circuits
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O.62
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Sophisticated equipment to measure interruptions on telephone-type circuits
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O.71
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Impulsive noise measuring equipment for telephone-type circuits
This Recommendation is also included but not published in V series under alias number V.55
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O.72
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[Withdrawn] Characteristics of an impulsive-noise measuring instrument for wideband data transmission
ITU-T O.72 was withdrawn on 1998-06-18.
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O.81
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Group-delay measuring equipment for telephone-type circuits
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O.82
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Group-delay measuring equipment for the range 5 to 600 kHz
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O.91
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Phase jitter measuring equipment for telephone-type circuits
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O.95
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Phase and amplitude hit counters for telephone-type circuits
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O.111
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Frequency shift measuring equipment for use on carrier channels
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O.131
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Quantizing distortion measuring equipment using a pseudo-random noise test signal
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O.132
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Quantizing distortion measuring equipment using a sinusoidal test signal
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O.133
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Equipment for measuring the performance of PCM encoders and decoders
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O.150
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General requirements for instrumentation for performance measurements on digital transmission equipment
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O.151
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Error performance measuring equipment operating at the primary rate and above
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O.152
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Error performance measuring equipment for bit rates of 64 kbit/s and N x 64 kbit/s
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O.153
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Basic parameters for the measurement of error performance at bit rates below the primary rate
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O.161
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In-service code violation monitors for digital systems
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O.162
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Equipment to perform in-service monitoring on 2048, 8448, 34 368 and 139 264 kbit/s signals
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O.163
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Equipment to perform in-service monitoring on 1544 kbit/s signals
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O.171
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Timing jitter and wander measuring equipment for digital systems which are based on the plesiochronous digital hierarchy (PDH)
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O.172
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Jitter and wander measuring equipment for digital systems which are based on the synchronous digital hierarchy (SDH)
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O.173
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Jitter measuring equipment for digital systems which are based on the optical transport network
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O.174
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Jitter and wander measuring equipment for digital systems which are based on synchronous Ethernet technology
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O.175
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Jitter measuring equipment for digital systems based on XG-PON
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O.181
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Equipment to assess error performance on STM-N interfaces
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O.182
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Equipment to assess error performance on Optical Transport Network interfaces
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O.191
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Equipment to measure the cell transfer performance of ATM connections
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O.201
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Q-factor test equipment to estimate the transmission performance of optical channels
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O.211
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Test and measurement equipment to perform tests at the IP layer
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O.220
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Framework for end-to-end QoS measurement and supervision for leased-circuit services
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O.Sup3.1
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[Withdrawn] Measuring instrument requirements - Sinusoidal signal generators and level-measuring instruments
This Supplement was withdrawn because its content was out of date
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O.Sup3.2
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[Withdrawn] Noise measuring instruments for telecommunication circuits
This Supplement was withdrawn because its content was out of date
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O.Sup3.3
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[Withdrawn] Principal characteristics of volume indicators
This Supplement was withdrawn because its content was out of date
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O.Sup3.4
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[Withdrawn] Consideration of interworking between different designs of apparatus for measuring quantizing distortion
This Supplement was withdrawn because its content was out of date
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O.Sup3.6
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[Withdrawn] Crosstalk test device for carrier-transmission on coaxial systems
This Supplement was attached to ITU-T Rec. O.1 (05/96) as Appendix I without further modification
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O.Sup3.7
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[Withdrawn] A measuring signal (multitone test signal) for fast measurement of amplitude and phase for telephone type circuits
This Supplement was renumbered as ITU-T Rec. O.81 Appendix I (06/98) without further modification
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O.Sup3.8
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[Withdrawn] Guidelines concerning the measurement of jitter
This Supplement was attached to ITU-T Rec. O.171 (04/97) as Appendix I without further modification
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