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AS ISO 22915.2:2021...
ITU-T G.421 Methods for interconnection
ITU-T G.223 Assumptions for the calculation of noise on hypothetical reference circuits for telephony
ITU-T G.224 Maximum permissible value for the absolute power level (power referred to one milliwatt) of a signalling pulse
ITU-T G.225 Recommendations relating to the accuracy of carrier frequencies
ITU-T G.228 Measurement of circuit noise in cable systems using a uniform-spectrum random noise loading
ITU-T G.229 Unwanted modulation and phase jitter
ITU-T G.230 Measurement methods for noise produced by modulating equipment and through-connection filters
ITU-T G.233 Recommendations concerning translating equipments
ITU-T G.241 Pilots on groups, supergroups, etc.