FSAN Releases New Roadmap for Fibre Access Standards

9 December 2016

A meeting of FSAN (Full Service Access Network) Group, a global forum of over 70 leading telecommunications service providers, testing labs and equipment manufacturers, was held recently in Hangzhou, China. The meeting took place during 14-18 November and included a special session to mark 20 years of FSAN.

Following from the XGS-PON and NG-PON2 systems, that were extensively studied in FSAN, and recently standardised by the ITU-T in Study Group 15, Question 2, the industry is considering the next steps for optical fibre based access systems. During their Hangzhou meeting, the FSAN group discussed many contributions concerning network operator requirements and technology options for such systems.

A roadmap is a key tool for guiding FSAN’s work and an update to the FSAN Standards Roadmap has recently been agreed by the FSAN Operators. FSAN has now publicly released this Roadmap to help guide the wider industry and serve as a stimulus for future standardisation and technology development in the related organizations, such as ITU-T, Broadband Forum, and IEEE. The new PON Standards Roadmap is available from the FSAN website (

FSAN’s new PON Standards Roadmap emphasises a smooth evolution from previously standardised, and deployed, PON systems through extensive re-use of the existing fibre infrastructure. System enhancements of most interest to the FSAN Operator group are identified as increased capacity, longer reach, improved availability (reliability), enhanced flexibility and peak service rates beyond 10 Gbps. Key industry trends that are expected to impact PON technology evolution are identified on the Roadmap as Software Defined Networking, Network Function Virtualisation 5th Generation Mobile Systems, Internet of Things, and the Convergence of networks and services.

In addition to supporting the previously deployed PON infrastructure, the PON Standards Roadmap recognises that ODNs (optical distribution networks) using alternative splitting approaches, other than that used extensively to date based on power splitting, may be of growing importance for emerging applications. For example, wavelength based splitters could offer distinct benefits.

In announcing the release of the new Roadmap, Peter Dawes, the Chair of the Next Generation PON Task Group in FSAN Optical Access Network Working Group, said, “After much consideration and discussion, the network operators in FSAN have identified their priorities and timelines for the evolution of fibre access systems. These have been encapsulated in the latest Roadmap and this will be used to guide the work of FSAN over the coming years. ”

Frank Effenberger, Rapporteur ITU-T Q2/15, welcomed the new PON Standards Roadmap from FSAN with the following statement, “For 20 years now FSAN has led the development of PON technologies and this new roadmap provides direction for the next 10 years. I look forward to continuing the successful collaboration of FSAN and the ITU-T in defining future PON standards based on this Roadmap from the FSAN Operators. It is hoped that other SDOs will also find this Roadmap a useful guide for their work.”

In addition to the FSAN meeting in Hangzhou, there was a collocated ITU-T Q2/15 interim meeting where technical contributions from FSAN members towards future PON standards were presented.


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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