OTN (Optical Transport Network) is the new Layer 1 protocol standardized by the ITU-T Study Group 15 in order to carry multi-gigabit signals across a fiber-optical infrastructure. OTN supersedes legacy SONET/SDH technology and is designed to address the challenges of a high-speed, Ethernet based, multi-service telecommunications infrastructure. In this context OTN introduces 3 novel elements:


- A dedicated Forward Error Correction (FEC) area that implements digital signal processing algorithms that can improve the effective Bit Error Rate (BER) of optically based links by as much as 8 or more orders of magnitude.


- OTN is optimized for Ethernet services. OTN is an asynchronous technology that does not impose synchronization requirements. Furthermore, OTN transports its client signals in their entirety without stripping overhead information. As an example in case, OTN will provide true transparent connectivity for Ethernet based services (1GE, 10GE, etc.)


- The basic granularity at which OTN operates is a 1.25Gbps container, ODU0. OTN also incorporates a mapping method known as GMP (Generic Mapping Procedure), that allows it to support the transparent transport of signals of arbitrary bit-rates. As an example in case, a 1GE Client Signal will be accommodated by an ODU0 bearer in its entirety, including code-words and ordered-sets.


The following link will allow you to benefit from a tutorial OTN presentation.


OTN Tutorial >>>