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ITU-T Recommendations
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ITU-T Recommendations
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ITU-T Recommendations by series
Select a series of Recommendations
A series: Organization of the work of ITU-T
D series: Tariff and accounting principles and international telecommunication/ICT economic and policy issues
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: Environment and ICTs, climate change, e-waste, energy efficiency; 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: Telephone transmission quality, telephone installations, local line networks
Q series: Switching and signalling, and associated measurements and tests
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, next-generation networks, Internet of Things and smart cities
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
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