ITU Home Page International Telecommunication Union Franšais  Espa˝ol 
Print Version 
ITU Home Page
Home : ITU-T Home : Study Period 2001-2004
OTN - Introduction, Scope and Abbreviations
Today's global communications world has many different definitions for optical transport networks and many different technologies that support them. This has resulted in a number of different Study Groups within the ITU-T, e.g. SG 4, 11, 13, 15 developing Recommendations related to optical transport. Moreover, other standards bodies, fora and consortia are also active in this area.
Recognising that without a strong coordination effort there is the danger of duplication of work as well as the development of incompatible and non-interoperable standards, the WTSA 2000 designated Study Group 15 as Lead Study Group on Optical Technology, with the mandate to:
  • study the appropriate core Questions (Question 9, 11, 12, 14, and 16/15),
  • define and maintain overall (standards) framework, in collaboration with other SGs and standards bodies),
  • coordinate, assign and prioritise the studies done by the Study Groups (recognising their mandates) to ensure the development of consistent, complete and timely Recommendations,
Study Group 15 entrusted WP 5/15, under Question 19/15, with the task to manage and carry out the Lead Study Group activities on Optical Technology. To maintain differentiation from the standardized Optical Transport Network (OTN) based on Recommendation G.872, this Lead Study Group Activity is titled Optical Transport Networks & Technologies (OTNT).

As the mandate of this Lead Study Group role implies, the standards area covered relates to optical transport networks and technologies. The optical transport functions include:

  • multiplexing function
  • cross connect function, including grooming and configuration
  • management functions
  • physical media functions.
The outcome of the Lead Study Group activities is twofold, consisting of a:
  • standardization plan
  • work plan,
written as a single document until such time as the distinct pieces warrant splitting it into two.
Apart from taking the Lead Study Group role within the ITU-T, Study Group 15 will also endeavour to cooperate with other relevant organizations, such as ETSI, Committee T1, ISO/IEC etc.


ASON Automatically Switched Optical Network
ASTN Automatically Switched Transport Network
ETSI European Telecommunications Standards Institute
IEC International Electrotechnical Commission
ISO International Organization for Standardization
MON Metropolitan Optical Network
OTN Optical Transport Network
OTNT Optical Transport Networks & Technologies
SDH Synchronous Digital Hierarchy
SONET Synchronous Optical NETwork
WTSA World Telecommunications Standardization Assembly


Top - Feedback - Contact Us - Copyright ę ITU 2004 All Rights Reserved
Contact for this page : TSB EDH
Updated : 2004-10-21