About OTN Technology

About OTN Technology

About OTN Technology

OTN (Optical Transport Network) is the Layer 1 protocol standardized by the ITU-T Study Group 15 in order to carry multi-gigabit signals across a fiber-optical infrastructure. It supersedes legacy SONET/SDH technology and is designed to address the challenges of a high-speed multi-service telecommunications infrastructure. OTN provides higher speed interfaces and better packet transport capabilities than earlier technologies and is typically used both in metro networks and long-haul networks to support higher bandwidth demands of business and consumer customers.

An increasing demand for OTN technology is expected from the growing need for mobile fronthaul (MFH) technology to help service providers accommodate leading edge, high-bandwidth applications for wireless devices like video and 3D gaming. OTN is considered the most appropriate technology for transporting CPRI, the prevailing communication protocol for the new mobile C-RAN (Cloud Radio Access Networks) deployments.

OTN introduces three novel elements over older technologies such as SONET/SDH: 

- 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 eight orders of magnitude or more.

 - 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. For example, OTN provides true transparent connectivity for Ethernet based services (1GE, 10GE, etc.)

 - Operates with the basic granularity of a 1.25Gbps container, ODU0. It 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. For example, a 1GE Client Signal would be accommodated by an ODU0 bearer in its entirety, including code-words and ordered-sets.

View IP Light’s OTN tutorial presentation>>