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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
L series
: Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant
L.1
:
Construction, installation and protection of telecommunication cables in public networks
L.2
:
Impregnation of wooden poles
L.3
:
Armouring of cables
L.4
:
Aluminium cable sheaths
L.5
:
Cable sheaths made of metals other than lead or aluminium
L.6
:
Methods of keeping cables under gas pressure
L.7
:
Application of joint cathodic protection
L.8
:
Corrosion caused by alternating current
L.9
:
Methods of terminating metallic cable conductors
L.12
:
Optical fibre splices
L.18
:
Sheath closures for terrestrial copper telecommunication cables
L.19
:
Multi-pair copper network cable supporting shared multiple services such as POTS, ISDN and xDSL
L.20
:
Creation of a fire security code for telecommunication facilities
L.21
:
Fire detection and alarm systems, detector and sounder devices
L.22
:
Fire protection
L.23
:
Fire extinction – Classification and location of fire extinguishing installations and equipment on premises
L.24
:
Classification of outside plant waste
L.32
:
Protection devices for through-cable penetrations of fire-sector partitions
L.33
:
Periodic control of fire extinction devices in telecommunication buildings
L.71
:
Design, construction, and installation of network cables for broadband access including metallic networks connected to optical fibre networks
L.75
:
Test, acceptance and maintenance methods of copper subscriber pairs
L.76
:
Copper loop requirements for various technologies including indoor and structured cabling
L.100-L.199
: Optical fibre cables
L.200-L.299
: Optical infrastructures
L.300-L.399
: Maintenance and operation
L.400-L.429
: Passive optical devices
L.430-L.449
: Marinized terrestrial cables
L.1000-L.1199
: E-waste and circular economy
L.1200-L.1299
: Power feeding and energy storage
L.1300-L.1399
: Energy efficiency, smart energy and green data centres
L.1400-L.1499
: Assessment methodologies of ICTs and CO2 trajectories
L.1500-L.1599
: Adaptation to climate change
L.1600-L.1699
: Circular and sustainable cities and communities
L.1700-L.1799
: Low cost sustainable infrastructure
L supplements
: Supplements to ITU-T L-series Recommendations
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