Improving interoperability Of SONET/SDH Optical networks via overhead transparency

摘要

Three years ago it appeared as if SONET/SDH was to be replaced by an all-optical future. Instead, SONET/SDH has undergone a renaissance of sorts, driven by IP and ATM over SONET standardization, as well as innovative and aggressive equipment design. There are some deployments of IP over Fibre, but in reality these use a SONET/SDH framing structure with some of the management functions disabled. The wide availability of chipsets and firmware, entrenched carrier software infrastructure, and well-understood and documented standards make SONET/SDH a safe choice for future optical networking deployment.