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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
E series
: Overall network operation, telephone service, service operation and human factors
E.100-E.229
: International operation
E.230-E.299
: Operational provisions relating to charging and accounting in the international telephone service
E.300-E.329
: Utilization of the international telephone network for non-telephony applications
E.330-E.349
: ISDN provisions concerning users
E.350-E.399
: International routing plan
E.400-E.489
: Network management
E.490-E.799
: Traffic engineering
E.800-E.899
: Quality of telecommunication services: concepts, models, objectives and dependability planning
E.900-E.999
: Other
E.1000-E.1999
: International operation
E.4000-E.4999
: Network management
E supplements
: Supplements to the E-series Recommendations
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