Implementers' Guide

InternationalImp

Description

ITU Implementers' Guides collect amendments, corrigenda, and errata into a single living document per Recommendation. Identified by an .Imp suffix on the base series (e.g. G.Imp712, X.ImpOSI).

Syntax

ITU Recommendations follow the pattern: ITU-[Sector] [Series][Number]-[Year]. Sectors include R (Radiocommunication), T (Telecommunication Standardization), and D (Telecommunication Development). The long-form "Recommendation ITU-[Sector] ..." prefix is accepted. Editions may be suffixed bis/ter/quater. Common-text identifiers co-published with ISO/IEC use the pipe separator: "Recommendation ITU-T X.1234 | ISO/IEC 5678-1".

Examples 2

ITU-T G.Imp712

ITU-T X.ImpOSI

Components Used

ITU Implementers' Guide 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 Implementers' Guide 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`