SC328 - New Developments in Optical Transport Networking (OTN)
Sunday, 19 March
17:00 - 20:00
Short Course Level: Beginner
Stephen Trowbridge; Alcatel-Lucent, USA
Short Course Description:
This course provides an introduction to a complementary set of standards for high-speed optical networking including the Optical Transport Network (OTN) standards developed by ITU-T Study Group 15, higher speed Ethernet (100 Gb/s, 200 Gb/s, 400 Gb/s) standards developed by IEEE 802.3, and the Flex Ethernet implementation agreement developed by the Optical Internetworking Forum (OIF).
Initially developed for DWDM transport of SONET/SDH, the OTN has evolved to provide a common convergence layer for IP and Ethernet traffic. The standard has evolved to move from a combination of point-to-point DWDM line systems and metro ROADM networks to a full, end-to-end managed network. The 2009 revision of the standard extended the OTN hierarchy "at both ends," adding a new lower tier (ODU0) optimized for the transport of 1000GBASE-X (Gigabit Ethernet), and a new upper tier (ODU4) optimized for the transport of the new 100GBASE-R (100 Gigabit Ethernet) as Ethernet came to replace SONET/SDH as the primary client carried over optical networks. DWDM networks based on OTN have provided a common convergence layer for SONET/SDH, IP, and Ethernet traffic. The ODUflex container allows the OTN to carry client signals at any rate, allowing support of data center interconnect and storage-area networking protocols such as Infiniband and Fibre-Channel, video distribution signals including various SDI and DVB_ASI signals, and mobile fronthaul/backhaul with support of CPRI. Recent work has focused on “OTN beyond 100G”, which has been undertaken as a general purpose approach allowing large aggregate signals to be composed of multiple wavelengths over the same fiber route, where the wavelengths may be different modulation formats and bit-rates according to the reach required for each connection, and to take advantage of flexible grid networks. This is being done both to improve spectral efficiency and to support new, emerging higher rate clients such as 400 Gb/s Ethernet and Flex Ethernet, which can create large OTN client signals through the bonding of multiple Ethernet PHYs.
Since the IEEE 802.3ae (10 Gb/s Ethernet) project in 2003, Ethernet has become an increasingly important client of the OTN. This was followed up with addition of 40 Gb/s and 100 Gb/s Ethernet in 2010 by 802.3bs, by 25 Gb/s Ethernet in the just-completed P802.3by project, addition of 200 Gb/s and 400 Gb/s Ethernet by the P802.3bs project now underway, and addition of 50 Gb/s Ethernet by the P802.3cd project, also currently underway. In addition to carrying Ethernet as an OTN client, in the cases where OTN line interface rates and Ethernet rates are common, the same pluggable modules are used for Ethernet interfaces as well as for OTN client (grey optics) interfaces.
The Flex Ethernet implementation agreement provides a way to create a range of Ethernet client rates that may not correspond to Ethernet physical layer PHY rates. This enables a variety of network scenarios including non-LAG bonding of Ethernet PHYs to support larger flows, matching of Ethernet rates to transport network line rates that may vary with modulation format and reach, and channelization of multiple Ethernet flows within a group of bonded PHYs.
OTN is being deployed by many operators for their next generation network builds. This course will cover the basic concepts of G.709, with specific emphasis on the recently added interfaces and capabilities. You will learn how Ethernet, Flex Ethernet and other traffic can be carried by an international standard based digital wrapper solution. You will develop an appreciation for the flexibility provided in the latest OTN standards to transport a wide variety of client signals and to efficiently manage bandwidth.
Short Course Benefits:
This course should enable you to:
• Understand the concepts that form the basis for an OTN based on ITU-T Recommendation G.709, including the capabilities of the OTN standards to manage client signals and wavelengths.
• Understand the mapping mechanisms used by OTN to transport major client signals.
• Understand the structure and format for higher rates of Ethernet.
• Understand the Flex Ethernet implementation agreement and the network configurations that can be supported.
• Know where to look to find more information about ITU-T G.709, IEEE 802.3 standards, and the Flex Ethernet implementation agreement.
Short Course Audience:
This course is intended for anyone who designs, operates, or supports metro and/or long haul optical networks and who need to understand the new interfaces and capabilities specified by standards on OTN, high-speed Ethernet, and Flex Ethernet.
Dr. Stephen J. Trowbridge is a Consulting Member of Technical Staff (CMTS) at Nokia. He received his B.S. (EE&CS), M.S. (CS), and Ph.D. (CS) from the University of Colorado, Boulder. He joined Bell Laboratories–AT&T (now Nokia) in 1977. He has been active in optical networking standardization since 1995. He is chairman of ITU-T Study Group15, Networks, Technologies and Infrastructures for Transport, Access and Home. He was a member of the IEEE P802.3ba 100 Gb/s Ethernet editorial team and is currently a member of the IEEE P802.3bs 200 Gb/s and 400 Gb/s Ethernet editorial team. He is editor of the Optical Internetworking Forum (OIF) Flex Ethernet implementation agreement. He was named a Bell Labs Fellow in 2014.