Optical Transport Network

In this article we will discuss Optical Transport Network, will make brief discussion on Optical Transport Network, In last article we discuss about PON.

Optical transport network (OTN) is a series of standards created to combine the benefits of SONET/SDH with the bandwidth-expanding capabilities of Dense Wave Division Multiplexing (DWDM) in order to build more network functionality into optical networks.

The OTN frame is very similar to a SONET frame in its structure and format. There are three overhead areas in an OTN frame: the Optical Payload Unit (OPU) overhead, the Optical Data Unit (ODU) overhead, and the Optical Transport Unit (OTU) overhead.

Cellphones work a different way: they send and receive information using invisible radio waves—a technology called wireless because it uses no cables. Fiber optics works a third way. It sends information coded in a beam of light down a glass or plastic pipe.

The optical transport network (OTN) and WDM layers make up a generic Layer-1 transport network, enabling different service types to coexist and share the same infrastructure transparently, without affecting each other’s performance.

The OTN does not require any synchronization functionality. The OTN – specifically the mapping/demapping/desynchronizing and multiplexing/demultiplexing processes and justification granularity information – is designed to transport synchronous client signals, like synchronous STM-N and synchronous Ethernet signals.

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