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SDH FUNDAMENTALSBy

Dr Muhammad Khalil Shahid

PTCL Training & Development

COURSE OBJECTIVESTo provide participants with a thorough understanding

of Synchronous Digital Hierarchy 

At the end of this course participants will be able to:• Outline the SDH frame structure• Understand the functions of Overhead Bytes and

related Alarms• Outline the link structure of SDH Network• Analyze Multiplexing Structure• Trace the VC-12 mapping in VC-4• Understand the Synchronization of SDH network

COURSE OUTLINE

SDH Basics SDH Frame Structure SDH Overheads SDH Multiplexing/Mapping SDH Synchronization and Protection

SDH Synchronous Digital Hierarchy SDH is a hierarchical set of digital

transport structures, standardized for the transport of suitably adapted payloads over physical transmission networks

An integrated transmission network managed by a powerful network management system

SDH A standard developed by ITU It is documented in standard G.707 and its

extension G.708 Developed to replace the Plesiochronous

Digital Hierarchy (PDH) system Allow interoperability between equipment

from different vendors with Strong Network Management capabilities

SDH ITU Recommendations

SDH refers to the rates and formats specified by ITU-T for synchronous data transmission over fiber optic networks.

ITU-T G.707: Network Node Interface for SDH ITU-T G.781: Structure of Recommendations on

Equipment for SDH ITU-T G.783: Characteristics of SDH Equipment

Functional Blocks ITU-T G.803: Architecture of Transport Networks

Based on SDH

PDH

Pre SDH Standard

3 standards..European, Japanese, North

America

European Standard in Pakistan

Complex Multiplexing structure

Weak monitoring

PDH Data Rates

PCM…… 64Kbps E1……… 2.048 Mbps (30 x64 Kbps) E2……… 8.448 Mbps E3……… 34.368 Mbps E4……… 139.264 Mbps E5……… 565 Mbps