OTN vs SDH
After nearly 25 years since the introduction of SDH, the evolution of this standard has ceased, and themajority of SDH equipment is reaching its planned end of life.
Optical Transport Network (OTN) technology represents a technical leap forward in optical networking over SDH.
Although OTN and SDH have similarities, there are also some significant design differences. Let’s compare them feature-by-feature to see just where those differences reside:
The biggest difference in the above feature list is that SDH was defined with fixed frame rates, while OTN was defined with fixed frame sizes. This fundamental change helps IP-based traffic to map into OTN much more efficiently than SDH. The tight integration of Internet Protocol (IP) and OTN via Ethernet is much more appropriate to the modern mix of networking protocols and traffic.
OTN incorporates comprehensive OAM, which efficiently manages network resources and services. Plus, by supporting standardized FEC, OTN enables service providers to extend the distance between optical repeaters, reducing expenses and simplifying network operations.
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