• “On behalf of Transnet Freight Rail (Telecoms department), a division of Transnet SOC, we are pleased to have attended the DWDM course offered by SBI in a two day period. We (TFR) have pressing needs in terms of understanding the DWDM technology in that the Transnet market demand strategy (MDS) needs us to be ready in capacity to support the goals of high tonnages and communication requirements by 2018. “SBI delivered training above our required expectations and all the engineers that participated valued the context of the course, and recommended it for broader use for technical persons within the company. “Personally, I have gained extensive knowledge that will help me to be part of the design, implementation and integration of the DWDM network within the Transnet communication network. The course is well structured, catering from basic to advanced skills, making it easier for everyone to follow and understand. The setup for learning, communication and team engagement delivered by SBI exceeded all our requirements.
    Kabelo Ngobeni, Transnet Freight Rail (TFR),Senior Engineer, Telecoms

Dense Wavelength Division Multiplexing (DWDM) Optical Networking  2-Day Course

Fibre Technologies | Introduction to WDM Technologies | WDM Equipment Components | Reconfigurable add/drop multiplexer | WDM Architectures | Protection for WDM | Optical control plane | WDM services | Optical transport network (OTN)

Success Builders International (SBI) is pleased to now be offering organisations using Optical Networks, a two-day course on DWDM Optical Networking. The course was held recently in Johannesburg for engineers from Transnet Freight Rail (Telecoms department).

The course is designed to provide an introduction to optical networking and DWDM technology. Dense wavelength division multiplexing (DWDM) is a technology that enables data from different sources to share an optical fiber, with each signal carried at the same time on its own separate light wavelength. Using DWDM, up to 80 or more separate wavelengths or channels of data can be multiplexed into a lightstream transmitted on a single optical fiber. This enables the bandwidth on a single fibre cable to be multiplexed up to terabits per second.  Each channel can carry a different protocol,   e.g. Ethernet and SDH.  DWDM is also sometimes called wave division multiplexing (WDM). The course also explains the difference between CWDM and DWDM.

The components of optical networks are discussed as well as how they are used in the design of modern all optical networks. The architectures of DWDM networks are also covered. How wavelength switched paths are established across an all optical core network using ROADM technology is explained. Management, control and protection of an optical network plus the technologies used to achieve this are described.

“Our clients came to us with this requirement, and as it is currently a module in our quality approved PLATFORM: Certificate in IP-based Next Generation Telecoms programme, we were happy to extract  and modify the DWDM section as a complete stand-alone two-day  training course,”  says SBI MD Caron Perkins. “We have already held the course for 23 engineers, including a range of skills from engineers in training to highly skilled engineering and management staff from Transnet, and the feedback has been very positive. We have already held the course for 19 advanced engineers and engineers in training from Transnet, and the feedback has been very positive.””

The full course consists of:

Fibre Technologies

  • Introduction to light wave technology
  • Fibre optic cable construction
  • Multi mode and single mode fibre
  • Theory of light propagation in fibre
  • Optical attenuation and low-loss windows
  • Optical spectrum
  • Transmission effects over fibre
  • Benefits of fibre

Introduction to WDM Technologies

  • Limitations of single wavelength systems
  • Multiplexing, Evolution of DWDM
  • Overview and comparison of DWDM andCWDM
  • CWDM, ITU G.694.2, channels, channel spacing
  • DWDM, ITU G.694.1, channels, channel spacing Wavelengths

WDM Equipment Components

  • Equipment components and building blocks
  • Optical transmitters, receivers
  • Optical Terminal Multiplexers (OTM)
  • Optical Multiplexers (OADM)
  • Optical Amplifiers, Optical line amplifier (OLA)
  • Erbium Doped Fibre Amplifiers (EDFA)
  • 3R regeneration
  • Transponders, Tuneable transponders
  • Optical and Electrical Cross Connects (OXC)

Reconfigurable add/drop multiplexer

  • Wavelength selectable switch (WSS) based ROADM
  • Multi-degree ROADM
  • NG ROADMs, colourless, directionless, contentionless, Gridless ROADMs

WDM Architectures

  • WDM network sections
  • Point-to-Point
  • Topologies: mesh, ring and star

Protection for WDM

  • < 50ms failover
  • Line protection: 1+1, 1:1, 1: N
  • Self-healing optical ring

Optical control plane

  • Data, management and control
  • Multilayer control plane
  • ASTN/ASON, GMPLS, OIF interfacing protocols

WDM services

  • SDH over WDM
  • Ethernet over WDM
  • IP over WDM

Optical transport network (OTN)

  • G709, digital wrapper, OTU-1,2,3,4
  • OTN frame structure
  • OTU mapping
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