Tuesday, June 22, 2010

Optical network standard mapped to new Ethernet specifications

ITU has agreed on updates to its widely deployed optical transport network (OTN) standards, including ITU-T G.709. The revisions provide mapping of a recently launched next generation high-rate Ethernet standard from IEEE into the OTN.

ITU said the Task Force ensured that the new Ethernet rates are transportable over optical transport networks, while ensuring collaboration between ITU-T Study Group 15 and the IEEE P802.3ba 40 GB/s and 100 GB/s Ethernet

Director, ITU Telecommunication Standardization Bureau, Malcolm Johnson, said, “Ethernet has evolved from the local area network of choice to become a real carrier grade solution. Co-hosted meetings and workshops, and a recognition that close collaboration was mutually beneficial, has led IEEE and ITU to agree a common mapping between the IEEE P802.3ba 40Gb/s and 100Gb/s standard and the ITU-T G.709 optical network standard. I have no doubt that the scalability provided by this excellent example of standards collaboration will see acceleration in end-to-end Ethernet deployment.”

According to ITU-T Recommendation G.709 “Interfaces for the Optical Transport Network (OTN)” describes a means of communicating data over an optical network. It is a standardized method for transparent transport of services over optical wavelengths in dense wave division multiplexing (DWDM) systems.

ITU noted that operators are facing challenges with the migration from traditional SDH/SONET to IP/Ethernet based services. ITU-T G.709 OTN is a vehicle to enable convergence, and for providing a common and SONET/SDH-like operational model for network administration, performance monitoring and fault isolation, without altering the individual services.

Using OTN, multiple networks and services such as legacy SONET/SDH, Ethernet, storage protocols and video can all be combined onto a common infrastructure.
Most importantly, unlike SONET/SDH, OTN is the only transport layer in the industry that can carry a full 10/40/100 Gb/s Ethernet signal from IP/Ethernet switches and routers at full bandwidth. With the rapid migration towards IP/Ethernet-based infrastructure, OTN becomes the transport layer of choice for network operators.

Senior Analyst, Sterling Perrin, said, “Heavy Reading network operator surveys have consistently shown strong and immediate operator demand for 100 Gigabit Ethernet, driven by the rapid increase in global IP traffic and exhaustion of existing 10 Gigabit networks. The collaboration by these two standards bodies, and the resulting standard, is exactly what the telecom industry needs to bring the next generation of Ethernet transmission to market. Heavy Reading fully expects this announcement to drive rapid market adoption.”

ITU pointed out that the amendment to ITU-T G.709 is part of a set of revisions that provide for interworking with the new Ethernet standard. Equipment functions that perform the mapping are part of revised ITU-T G.798, equipment management functions are part of revised ITU-T G.874, and the jitter characteristics of this (and other) mapping(s) are in revised ITU-T G.8251.

Chair, IEEE P802.3ba Task Force Director, John D’Ambrosia, said, “Developing the next generation of Ethernet required consideration of the entire eco-system in which it resides. Communications between the IEEE and ITU-T addressed the issues that would impact the end-to-end Ethernet deployment. This interaction led to the two bodies developing standards that complement each other in order to ensure the optimal solution for 40GbE and 100GbE. I would like to express my gratitude to the ITU-T for its co-operative efforts with the IEEE P802.3ba Task Force. Furthermore, I would like to congratulate the ITU-T on the completion of its G.709 specification, which is part of the optimized 40GbE and 100GbE end-to-end solution.”