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Search for ITU-T Recommendations and Supplements: ITU-T Recommendations under Study Group 15 responsibility

SG 15 Recommendations G series: Transmission systems and media, digital systems and networks I series: Integrated services digital network L series: Construction, installation and protection of cables and other elements of outside plant O series: Specifications of measuring equipment P series: Terminals and subjective and objective assessment methods Q series: Switching and signalling R series: Telegraph transmission V series: Data communication over the telephone network X series: Data networks, open system communications and security Y series: Global information infrastructure, Internet protocol aspects and next-generation networks