O'Reilly logo

The Cable and Telecommunications Professionals' Reference, 3rd Edition by Goff Hill

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

11   Next Generation Synchronous Digital Hierarchy

Ken Guild

University of Essex

Introduction

In the last 20 years, Synchronous Digital Hierarchy (SDH) has established itself as the predominant optical fiber transmission technique in European operator networks. The SDH format is very similar to the North American SONET format but with some modifications to accommodate the different legacy Plesiochronous Digital Hierarchy (PDH) transmission schemes used in Europe. Although this chapter focuses primarily on SDH, the fundamental principles of Next Generation SDH (NG-SDH) are identical to those of its SONET counterpart, except for the different multiplexing hierarchies between SDH and SONET, which are described in Chapter 10.

Recently there have ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required