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Discover the Principles and Potential of SDH Networks.

DUBLIN, Ireland -- Research and Markets ( has announced the addition of E-Learning Course: SDH Payloads to their offering.

"SDH Payloads" describes the payload capabilities of SDH links and the methods of carrying different types of payload over an SDH network. This course covers such topics as virtual containers and the transport of ATM, IP and Ethernet traffic over an SDH network.

Course aim: After completing this course a trainee will be able to describe how different types of traffic are transported over an SDH network. The role and significance of Tributary Units is discussed and the methods of carrying plesiochronous, synchronous and asynchronous traffic described. The role of the different types of SDH overhead is also explained.

Pre-requisites: Understanding of the principles of the SDH and an understanding of the principles of packet switching including ATM and the Internet Protocol (IP); knowledge of the principles and components of an Ethernet LAN would also be advantageous. It is recommended that SyncNet course B: "Principles of SDH", TransNet course D "ATM principles", and the Ethernet courses A and B ("Ethernet fundamentals" and "Ethernet networks") are studied before attempting this course


A Transmission principles

B SDH principles

C Optical line systems inc WDM

D SDH payloads

E SDH networks

F SDH network management and maintenance

Target audience:

- Those studying for a career in telecommunications and who require a detailed knowledge of modern optical broadband transmission networks.

- Technical staff involved in the operation, installation or maintenance of SDH-based broadband networks.

Course Content:

AU payloads: Transporting a 140 Mbit/s signal within a STM-1 frame

revision of the concept of virtual containers

structure of a VC-4

concept of an Administrative Unit (AU)

operation and use of an AU pointer

role and operation of byte justification.

TU payloads: Mapping 34 Mbit/s signals into an STM-1 frame

structure of a VC-3

overview of the concept of Tributary Units (TU)

transporting VC-3s within a VC-4

operation and use of TU pointers.

TUG payload: Concept of a Tributary Unit Group (TUG)

the different types of TUG and their payload capacity

description of the use of TU-12s, TUG-2s and TUG-3s to map up to sixty-three 2 Mbit/s signals into a single 155 Mbit/s STM-1 frame

transporting groups of CEPT and ANSI signals within the same STM-1 frame

asynchronous and byte synchronous 2 Mbit/s (VC-12) payloads

comparison of the locked and unlocked configurations of byte synchronous operation.

Path overhead (POH): Review of the role of Section Overheads (SOH) of an STM frame

role of the Path Overhead (POH) of a Virtual Container (VC)

comparison of the roles of Multiplex Section Overhead (MSOH), Regenerator Section Overhead (RSOH) and POH

structure of the POH in higher-order and lower-order VCs and function of the individual POH bytes.

ATM over SDH: Sharing the bandwidth of an SDH-based optical link with different types of traffic

overview of the benefits of the Asynchronous Transfer Mode (ATM)

basic structure of an ATM cell

interfacing ATM switches with SDH multiplex equipment

mapping ATM cells into a VC-4 virtual container of an STM-1 frame

role of the Transmission Convergence (TC) ATM protocol

function of those STM section and path overheads used by ATM equipment.

IP over SDH: Overview of the use of ATM virtual circuits to provide a differentiated quality of service for IP traffic

transporting IP traffic over an SDH network without the use of ATM

functions and operation of the Point to Point Protocol (PPP)

mapping PPP frames into a VC-4 STM virtual container

comparison of the benefits of the use of ATM and PPP

overview of the use of Wavelength Division Multiplexing (WDM) to transport IP traffic over an optical network.

Ethernet over SDH: The disadvantages of the use of PPP

introduction to the Generic Framing Procedure (GFP) and its use in interconnecting Ethernet Local Area Networks

principles and advantages of virtual concatenation

role and principles of the Link Capacity Adjustment Scheme (LCAS)

summary and comparison of the various methods of transporting IP traffic over an SDH Network.

For more information visit
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Publication:Business Wire
Date:Oct 11, 2006
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