Recommendation

InternationalRec

Description

ITU Recommendations (sometimes called ITU-T Standards) define specifications for telecommunications technologies. The long-form "Recommendation ITU-T ..." prefix is accepted, as are edition suffixes bis/ter/quater.

PublishedITU-[Sector] [Series].[Number]

With yearITU-[Sector] [Series].[Number]-[Year]

Examples 6

ITU-R 01-201

ITU-T G.992.1

ITU-R SA.1014-4

ITU-T E.164

Recommendation ITU-T G.992.1

ITU-T H.264 bis

Components Used

ITU Recommendation identifiers are composed of these elements:

Sector

Enumeration

ITU sector: R (Radiocommunication), T (Standardization), D (Development)

R (Radiocommunication)T (Standardization)D (Development)

Required. After hyphen following ITU.

e.g.T

:sector

Series

Enumeration

The series letter (e.g., G, E, H, SA)

GEHIJLMN +9 more

Required. Follows sector, separated by dot.

e.g.G

:series

Number

String

The recommendation number

Series-specific. Often includes dot-separated sub-numbers.

e.g.992.1

Year

Publication year

Optional. Preceded by hyphen.

e.g.2019

Algebraic Relations

Relations that can involve Recommendation identifiers:

Relation	Description	Syntax	Example
Amendment	Modifies a Recommendation	`ITU-[Sector] [Series].[Number]/Amd [N]`	`ITU-T G.992.1/Amd 1`
Corrigendum	Corrects errors	`ITU-[Sector] [Series].[Number]/Cor [N]`	`ITU-T G.992.1/Cor 1`
Supplement	Additional content	`ITU-[Sector] [Series].[Number] Suppl [N]`	`ITU-T G.992.1 Suppl 1`