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New ITU-T standard for 10 Gbit/s symmetric fibre to the home

ITU-T members have achieved first-stage approval (“consent”) of a new international standard for optical access at the rate of 10 Gbit/s both downstream and upstream. The new standard will be particularly beneficial to operators as a cost-effective means of upgrading the capacity of the connections provided to businesses in need of symmetrical service.

Recommendation ITU-T G.9807.1 “10-Gigabit-capable symmetric passive optical network” (XGS-PON) was developed by ITU’s standardization expert group responsible for networks, technologies and infrastructures for transport, access and home, ITU-T Study Group 15.

XGS-PON offers a point-to-multipoint optical access system to support a wide range of broadband and narrowband services to homes and businesses, as well as mobile backhaul and other applications.

XGS-PON reuses existing PON standards to the maximum extent possible and capitalizes on PON development efforts underway in the industry. The physical layer of XGS-PON follows XG-PON (ITU-T G.987.2) and 10GE-PON (IEEE Standard 802.3). The standard fully supports operators’ use of existing 10 Gbit/s symmetric transceiver components. The design of the XGS-PON protocol layer is based on NG-PON2 (ITU-T G.989.3) and XG-PON (ITU-T G.987.3), and its ONU management and control mechanism is specified in ITU-T G.988.

XGS-PON operates on the same optical distribution network (ODN) as XG-PON. The typical distance between the optical line terminal (OLT) and an optical network unit (ONU) is 20 km, and one OLT is capable of supporting up to 128 ONUs. The XGS-PON wavelength plan provides for co-existence with G-PON, XG-PON and NG-PON2. An XGS-PON system is fully backward compatible with XG-PON ONUs, allowing the operation of both XGS-PON and XG-PON ONUs under a single XGS-PON OLT port.

ITU-T’s suite of standards for 10 Gbit/s fibre to the home

The ITU-T family of 10 Gbit/s PON standards now offers both asymmetric and symmetric transmission for broadband services, with XG-PON enabling downstream service at 10 Gbit/s and upstream service at 2.5 Gbit/s, and XGS-PON enabling 10 Gbit/s bi-directional service.

The ITU-T standards underlying optical systems for fibre access networks are developed by experts working under the auspices of Question 2 of ITU-T Study Group 15. These experts continue to work in the interests of enhancing the data rates achieved by fibre access networks. A study of 25 Gbit/s per wavelength over PON has been initiated with the aim of enhancing the capacity of PON systems to beyond 100 Gbit/s.

More information on ITU-T Study Group 15 can be found on the group’s homepage.


Full Service Access Network Organization Recommends Path for Next-Generation PON Technology

Industry Experts in FSAN Agree on Technology for NG-PON2 for Greater System Capability and Enhanced Services

Santa Clara, Calif. — July 16, 2012 — In an effort to drive toward a common goal of true broadband fiber access networks, operator members of the Full Service Access Network (FSAN) organization unanimously agreed on an approach regarding next-generation passive optical network (PON) technology.

The agreed upon approach is a time and wavelength division multiplexed (TWDM) solution with optional wavelength division multiplexed (WDM) overlay extensions designed for the next generation passive optical network. NG-PON2 is the next iteration of PON technology, designed to meet a broad range of projected communication needs such as business and mobile backhaul applications as well as residential access. This approach means NG-PON2 can support increased capacity, higher light-to-port ratios, improved interoperability, and enhanced services.

The FSAN decision was based on operator network requirements, desired availability timeframe, and technology risk. By agreeing to this focused direction, industry efforts and NG-PON2 standardization work can progress through contributions to ITU-T Study Group 15 – Question 2 Access Working Group (Q2/SG15). The resultant ITU-T Recommendations will define standards for the NG-PON2 architecture and technology.

“FSAN made significant progress during its late June meeting in Santa Clara, Calif., when the group focused on developing draft text for the NG-PON2 Requirements and Physical Media Dependent Layer specifications,” said FSAN Chair Martin Carroll of Verizon. “If rapid progress can continue to be made, standards could be ratified as early as 2013, which will give the industry a clear path to more advanced, highly capable broadband access networks.”

While still developing enhancements to GPON and XGPON, FSAN also is focused on defining the NG-PON2 system. This new system will increase PON capacity to at least 40Gb/s and deliver services of 1Gb/s or more with platforms that could be deployable in 2015. Since it began working on NG-PON2 in 2010, FSAN has progressed from operator agreement on requirements to the analysis of candidate technologies and solutions that are supported by in-depth technical contributions from highly experienced industry leaders around the world.


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