SDH Transmission Sytems and networks


  • The SDH technique features numerous accessory functions and advantages, beginning with its very high transmission capacity
  • High capacity SDH backbone networks are the transmission infrastructure not only of legacy telephone networks, but also of packet-switched broadband networks.
  • Ethernet over SDH (EoSDH) is the latest trend in the transmission network.


Instructor led training , Conducted on regular and fast track program. Contact us.

What you will gain?

After completing this course, the participant will understand about:

  • principles of traditional FDM and PCM multiplexing of telephone channels;
  • PDH multiplexing- E1 / E3/ DS3;
  • the SDH frame structure, overhead and multiplexing schemes;
  • the SDH pointer justification mechanism; K L M concepts.
  • basics of SDH network synchronization;
  • basics of SDH network management; DCN networks;
  • Techniques and practical procedures for SDH system testing.
  • NOC Processes
  • EoSDH


Degree in engineering from ECE / CS /EEE /E&I with basic knowledge on digital communication is recommended. Industrial experience with telecom service provider /vendor is preferred.

Who should attend?

This course has been designed for the technical personnel of telecommunications service providers, equipment suppliers and NOC engineers. This may also  include PDH/SDH system engineers, network planners, engineers in charge of system testing, operation & maintenance , NOC and customer support.  The richness and depth of course topics cover a wide spectrum of practical and theoretical issues.

Practicals :

Excellent lab facility is available with SDH equipments to carryout different configuration , provisioning , fault management and O&M activities. Latest EoSDH facilities are also available.

Course outline

1. Introduction to Multiplexing

  • Frequency division multiplexing (FDM) and FDM hierarchy
  • Analog/digital conversion
  • Time division multiplexing (TDM)
  • PCM telephone multiplex
  • Synchronous digital multiplexing
  • Optical multiplexing (WDM, OTDM)

2. PDH transmission systems

  • Asynchronous digital multiplexing
  • Bit justification
  • Frame structure
  • PDH multiplexing hierarchy
  • PDH equipment
  • Drawbacks

3. SDH transmission systems

  • Historical outline
  • ITU-T standards
  • Advantages compared to PDH
  • SDH & SONET hierarchical levels

4. SDH frame structure

  • ETSI and ITU-T multiplexing schemes
  • Multiplexing elements
  • Examples of synchronous multiplexing
  • Pointer justification
  • Concatenation
  • Overhead
  • SDH frame for radio systems
  • BIP-n codes: bit error rate estimation

5. Ethernet  over SDH

  • Overview
  • LCAS
  • VCAT
  • VC12 mapping in SDH

6. IP over SDH (Packet over SDH)

  • Motivation
  • Protocol stack
  • Beyond STM-16

7. SDH equipment

  • Functional schemes
  • Scrambling
  • Alarms and alarm states
  • Physical interfaces and line systems
  • Regenerators
  • Line Terminal Multiplexers, Add Drop Multiplexers (ADM) and application examples
  • Digital Cross Connect (DXC) and application examples
  • Radio relay equipment and application examples

8. SDH network architectures

  • Overview
  • Traffic protection: line protection, ring protection, restoration in DXC networks
  • Applications

9. Synchronization aspects in SDH networks

  • Synchronization in telecommunications
  • Timing relationships among digital signals
  • Synchronous and asynchronous transport modes
  • Jitter and wander
  • Causes of jitter and wander in SDH transmission systems
  • Network synchronization
  • Models and characterization of clocks

10.Testing of SDH equipment and systems

  • Instrumentation
  • Testing of SDH equipment
  • Testing of SDH systems

11. Basics of SDH network management

  • General model of Telecommunication Management Network (TMN)
  • TMN functional architecture
  • TMN physical architecture
  • Information model
  • SDH network management
  • NOC processes

12.  Introduction to fiber optical networks

  • Different types of fiber – SM , MM
  • Different wavelengths in optical communication
  • Link engineering in OFC communication
  • Testing of OFC links.
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