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ITU-T Recommendations Extended search Advanced search Provisional name ISO/IEC Number Formal description Study Groups tree view All SGs TSAG Study Group 2 Study Group 3 Study Group 5 Study Group 9 Study Group 11 Study Group 12 Study Group 13 Study Group 15 Study Group 16 Study Group 17

Search for ITU-T Recommendations and Supplements: ITU-T Recommendations by series Select a series of Recommendations A series: Organization of the work of ITU-T D series: General tariff principles E series: Overall network operation, telephone service, service operation and human factors F series: Non-telephone telecommunication services G series: Transmission systems and media, digital systems and networks H series: Audiovisual and multimedia systems I series: Integrated services digital network J series: Cable networks and transmission of television, sound programme and other multimedia signals K series: Protection against interference L series: Construction, installation and protection of cables and other elements of outside plant M series: Telecommunication management, including TMN and network maintenance N series: Maintenance: international sound programme and television transmission circuits O series: Specifications of measuring equipment P series: Terminals and subjective and objective assessment methods Q series: Switching and signalling R series: Telegraph transmission S series: Telegraph services terminal equipment T series: Terminals for telematic services U series: Telegraph switching 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 Z series: Languages and general software aspects for telecommunication systems

G series: Transmission systems and media, digital systems and networks G.100-G.199: International telephone connections and circuits G.200-G.299: General characteristics common to all analogue carrier-transmission systems G.300-G.399: Individual characteristics of international carrier telephone systems on metallic lines G.400-G.449: General characteristics of international carrier telephone systems on radio-relay or satellite links and interconnection with metallic lines G.450-G.499: Coordination of radiotelephony and line telephony G.600-G.699: Transmission media and optical systems characteristics G.700-G.799: Digital terminal equipments G.800-G.899: Digital networks G.900-G.999: Digital sections and digital line system G.1000-G.1999: Multimedia Quality of Service and performance – Generic and user-related aspects G.6000-G.6999: Transmission media characteristics [Empty] G.7000-G.7999: Data over Transport – Generic aspects G.8000-G.8999: Packet over Transport aspects G.9000-G.9999: Access networks G supplements: Supplements to ITU-T G-series Recommendations