About Us
IEC Homepage
Press Releases
IEC Fellows
Consortium Programs
University Program
Media Sponsors and Partners
ECEDHA Affiliate
Conferences & Events
Speaking Opportunities
Request More Information
Browse Subjects
Top Bestsellers
New Releases
Guidelines for Publication
On-Line Education
Communications Technologies Program (CTP)
WebProForum tutorials
Virtual Exhibits
Contact Us
Contact Information
Email Us
IEC On-Line Education
Web ProForums options

·Sponsorship Opportunities
·Principal Sponsors
· All
· New Tutorials
· Broadband
· Business
· Communications
· Internet, IP Communications, and Computer Applications
· Network Operations
·Communications Technologies Program
·Web ProForums
·Virtual Exhibits
Our members enjoy exclusive access to selected white papers and multimedia iForums.
Consider these and other benefits of our FREE registration, or register by clicking here.

Already a member? Please click here to log in.


AON Synchronous Digital Hierarchy (SDH)

Definition and Overview


Synchronous digital hierarchy (SDH) and synchronous optical network (SONET) refer to a group of fiber-optic transmission rates that can transport digital signals with different capacities.


This tutorial discusses synchronous transmission standards in world public telecommunications networks. It will cover their origins, features, applications, and advantages, as well as their impact on network design and synchronous signal structure.

This tutorial concentrates on the most common form of SDH, that defined by the European Telecommunications Standards Institute (ETSI) for Europe but now used everywhere outside of North America and Japan. The Japanese version of SDH differs only in details that are touched on here but are not significant for the purposes of this tutorial. SONET was defined by the American National Standards Institution (ANSI) and is used in North America. This tutorial refers to SONET where appropriate; a more detailed discussion is available in the International Engineering Consortium's (IEC's) SONET Web ProForum tutorial.

The reader is assumed to be comfortable with the basic concepts of a public telecommunications network, with its separate functions of transmission and switching, and is assumed to be aware of the context for the growth of broadband traffic. No specific prior knowledge is assumed about hardware or software technologies.

This material is based on an article first published in the IEE Electronics & Communication Engineering Journal, June 1994, and the copyright to that article is owned by the (UK) Institution of Electrical Engineers.

For dynamic, free, streaming multimedia seminars on critical communications topics, visit the iForums

Download PDF
DOWNLOAD PDF of this tutorial
Definition and Overview
1 Introduction: Emergence of SDH
2 SDH Standards
3 SDH Features and Management
4 Network Generic Applications
5 Network Generic Applications: Equipment and Uses
6 Cross-Connect Types
7 Trends in Deployment
8 Network Design
9 SDH Frame Structure
10 Virtual Containers
11 Supporting Different Rates
Correct Answers
Comment on This Tutorial
Copyright © 2002 International Engineering Consortium
Terms of Use | Privacy Policy