Wikipedia

10G-PON

(Redirected fromG.987)

10G-PON(also known asXG-PONorG.987) is a 2010computer networkingstandard fordata links,capable of delivering sharedInternet accessrates up to 10 Gbit/s (gigabits per second) over existingdark fiber.This is theITU-T's next-generation standard following on fromGPONor gigabit-capable PON.Optical fibreis shared by many subscribers in a network known asFTTxin a way that centralises most of thetelecommunicationsequipment, often displacing copper phone lines that connect premises to the phone exchange.Passive optical network(PON) architecture has become a cost-effective way to meet performance demands inaccess networks,and sometimes also in large optical local networks forfibre-to-the-desk.[1]

10G-PON
10-Gigabit-capable passive optical network (XG-PON & XGS-PON)
AbbreviationG.987
StatusIn force
Year started2010
Latest version3.0
June 2012
OrganizationITU-T
CommitteeITU-T Study Group 15
Base standardsGPON
Related standardsNG-PON2,Higher Speed PON
DomainTelecommunication
LicenseFreely available
Websitewww.itu.int/rec/T-REC-G.987

Passive optical networks are used for thefibre-to-the-homeorfibre-to-the-premiseslast milewith splitters that connect each central transmitter to many subscribers. The 10 Gbit/s shared capacity is the downstream speed broadcast to all users connected to the same PON, and the 2.5 Gbit/s upstream speed uses multiplexing techniques to prevent data frames from interfering with each other. Each user has a network device that converts between the optical signals and the signals used in building wiring, such asEthernetand wired analogueplain old telephone service.XGS-PON is a related technology that can deliver upstream and downstream (symmetrical) speeds of up to 10 Gbit/s (gigabits per second), first approved in 2016 as G.9807.1.[2][3]XGS-PON usestime division multiplexing(TDM) andtime division multiple access(TDMA).[4]

Standards

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ITU-TG.987 is the standard for 10G-PON.[5]

Asymmetric 10G-PON is specified as XG-PON1: 10 Gbit/s downstream and 2.5 Gbit/s upstream (nominal line rate of 9.95328 Gbit/s downstream and 2.48832 Gbit/s upstream).

Symmetric 10G-PON is also proposed as XG-PON2 with 10 Gbit/s upstream, but would require more expensive burst-modelasersonoptical network terminals(ONTs) to deliver the upstream transmission speed. Another symmetric 10G-PON standard is XGS-PON (ITU-T G.9807.1, approved 2016-06-22).

Framing is "G-PON like" but uses different wavelengths from G-PON (using aWDM to separate them)[6]so that G-PON subscribers can be upgraded to 10G-PON incrementally while GPON users continue on the original optical line terminal (OLT). The G-PON standard isG.984.[7]This compares to theIEEE802.3avstandard for10G-EPONbased onEthernet,which has standardised upstream rates of both 1 Gbit/s and 10 Gbit/s.[8]The 10 gigabit PON wavelengths (1577 nm down / 1270 nm up) differ from GPON and EPON (1490 nm down /1310 nm up), allowing it to coexist on the same fibre with either of the gigabit PONs.[9]

G.987

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ITU-TRecommendation G.987 is a family that defines this access network standard (referred to as XG-PON). It comprises four recommendations:

  • G.987:10-Gigabit-capable passive optical network (XG-PON) systems: Definitions, Abbreviations, and Acronyms, 2010.
  • G.987.1:General requirements of 10G-PON systems(approved 2010-01-13).Includes examples of services, user network interfaces (UNIs) and service node interfaces (SNIs), as well as the principal deployment configurations that are requested by network operators.
  • G.987.2:Physical media dependent (PMD) layer specification(approved 2010-01-13, updated 2010-10-07).Describes a flexible optical fibre access network representing an evolutionary development from G.984.2, asymmetric only in the current version.
  • G.987.3:Transmission convergence (TC) specifications(approved 2010-10-07).

G.988

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There is also a companion ITU-T standard defining a management and control interface for administering optical network units, referred to by the G.987 recommendations.

  • G.988:ONU management and control interface (OMCI) specification(approved 2010-10-07).

ONU equipment

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Theoptical network unit(ONU) supplies network services from the PON tocustomer premises,connectingcustomer-premises equipmentsuch as a home gateway or office firewall. Anoptical network terminal(ONT) is an ONU that functions as ademarcation pointservicing a single subscriber; e.g., a dwelling or office. ONU devices supplyEthernetand possibly other services to the users, either directly (bybridging) or through a gateway device such as aresidential gateway,firewall,and/orrouter,POTS,CATVsignals to buildings wired for RF video, and some may even be compatible with the emergingG.hnhome networking standard.

The ONU receives the downstream data from the Internet or private networks, and also uses time slots allocated by the OLT to send the upstream traffic in burst-mode.TDMAtime slots prevent collisions with upstream traffic from other users sharing the same physical PON.

Fibre-to-the-cell siteis another emerging application, but has extra synchronisation requirements. A specialisedcellular backhaul unit(CBU) can provide PON access forcellular networks.

OLT and access nodes

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The OLT (optical line terminal) connects the PON to aggregatedbackhauluplinks, allocates time slots for ONUs and ONTs to transmit upstream data, and transmits shared downstream data in broadcast-mode over the PON to users. Since 10GPON is designed to coexist with GPON devices, migration to a 10GPON capability could be done by upgrading the OLT and then migrating individual ONUs as needed.

Normally the OLT is on a card that slots into an OLT chassis at thecentral office(CO), which uses special uplink cards forEthernetbackhaul to the telecommunications provider's network and internet. Uplink cards on access equipment will likely use multiple Ethernet interfaces, although it remains to be seen what uplink speeds manufacturers will offer to support 10GPON access. Locating OLTs inoutside plantcabinets may be an option for reach extension as a way to minimise the number of central offices covering low population density areas.

ITU and IEEE are planning for convergence of their specifications at the physical layer in 10G that would allow for the shared chips, optics and hardware platforms, thus driving cost reductions for hardware manufacturers.[10]

Optical distribution network

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PONoptical distribution networksusesingle-mode optical fibrein theoutside plant,optical splittersandoptical distribution frames,duplexed so that both upstream and downstream share the same fibre on separate wavelengths. 10G-PON is no exception with similar reach to previous standards but supporting a higher split ratio of 128 users per PON, or more using reach extenders/amplifiers.Optical splitterscreating apoint to multipointtopology are also the same technology as those used by other PON systems. This means any PON network should be upgradable by changing the ONT and OLT terminals at each end, with no change to the fibre itself unless different connectors are chosen.

"An Optical Distribution Network (ODN) being installed today will likely need to support four or more generations of PON over its expected 30 – 40 year life... The fibre should enable maximum flexibility to support any potential new PON technology, be protected with proven, reliable cabling making it easy to install and reliable, and be joined by advanced, low labor and low loss connectivity. The cost of the ODN materials (fibre, cable, and connectivity) at only about 8% comprises a surprisingly small portion of the total network cost."[9]

In an effort to extend the reach with support for 128 splits, the standard supports a range of optical budgets from 29 dB to 31 dB. A draft update to the standard is expected to further extend this to 33 dB and 35 dB budget classifications. A PON with a 35 dB optical budget could span 25 km or more and be shared/split among 128 subscribers.[11]XGS-PON also supports split ratios of up to 1:128.[12]

Some ONTs can receive a broad range of optical spectrum from 1480 nm to 1580 nm, so making the 10G-PON downstream signal visible to G-PON receivers. As a result, ONTs must block the unwanted downstream signals with a wavelength blocking filter (WBF), a small passive optical device.[11]

Field trials

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  • In October 2010, Portugal Telecom reported a successful field trial of 10G-PON, transmitting 3D-TV content using XG-PON1 capabilities.[13]
  • Verizonalso successfully completed a field trial of the pre-standard XG-PON2 (synchronous 10G-PON) capable of delivering a 10 Gbit/s broadband connection both downstream and upstream. In October 2010, at a Verizon customer's business in Taunton, Mass., the XG-PON2 trial used the same optical fibre that provides that business with its existing FiOS network connection and services.
  • BT in the UK is providing a trial 10-Gbit/s broadband service to a business customer in Cornwall using XGPON technology, it announced on 23rd Nov 2012.[14]
  • Chorus in New Zealand is providing a trial 10-Gbit/s broadband service to customers using XGS-PON technology. It was announced on 18th Nov 2019.[15]
  • OpenFiber (wholesale-only FTTH carrier in Italy) has successfully trialled a 10 Gbit service with coexisting GPON on the same fiber, using XGS-PON technology from ZTE, on March 14, 2019 in collaboration with ISP Fibra.city.[16][17]
    • Announced the commercial availability on its OpenStream product (bitstream access) on March 26, 2021.[18]
  • Telecom Italia is starting a trial on three exchanges in Italy using XGS-PON equipment from Nokia, both to its retail customers and to its wholesale clients.[19][20][21]

Home Internet service providers

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Commercial Internet service providers

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See also

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References

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  1. ^ITU (2018-12-22)."ITU brings new clarity to 5G transport".ITU News.Archivedfrom the original on 2021-04-05.Retrieved2021-04-05.
  2. ^"XG-PON or XGS-PON: don't make a costly spelling mistake".www.nokia.com.
  3. ^"G.9807.1: 10-Gigabit-capable symmetric passive optical network (XGS-PON)".
  4. ^"10 GBPS Symmetrical with XGS-PON |".25 May 2019.
  5. ^"10-Gigabit-capable passive optical networks (XG-PON): General requirements".G.987.International Telecommunication Union. January 13, 2010.RetrievedMay 7,2011.
  6. ^Dahlfort, Stefan (2009-09-22).Comparison of 10 Gbit/s PON vs WDM-PON(PDF).ECOC 2009.
  7. ^G.984.1: Gigabit-capable passive optical networks (G-PON): General characteristics
  8. ^Chang, Frank; Kramer, Glen; Hajduczenia, Marek; Mandin, Jeff; Yoon, Bin Yeong."Overview of 10Gb/s EPON Status, Requirements and Applications"(PDF).Archived fromthe original(PDF)on 2010-10-10.Retrieved2018-11-26.
  9. ^abGeorge, John. "PONs Can Keep Pace with Exploding Bandwidth Demand" - FTTH Prism: Vol. 7, No. 2, July 2010Archived2011-07-08 at theWayback Machineretrieved 06 Nov 2010
  10. ^"10G EPON- Unleashing the Bandwidth Potential"(PDF).Telecom Asia.ZTE Corporation. 2009-08-04.Archived(PDF)from the original on 2017-08-29.Retrieved2022-05-08.
  11. ^ab"Smith Joe, Loveland Richard, Rao Bhavani, Alcatel-Lucent." The Migration To 10G GPON "- FTTH Prism: Vol. 7, No. 2, July 2010 retrieved 06 Nov 2010"(PDF).Archived fromthe original(PDF)on 2011-07-08.Retrieved2018-11-26.
  12. ^"10 GBPS Symmetrical with XGS-PON |".25 May 2019.
  13. ^BBWF 2010: Huawei's 10G GPON CoupArchived2012-10-13 at theWayback Machinepublished 2010/10/28, access 2010/11/06.
  14. ^Total Telecom
  15. ^"Chorus' Hyperfibre set to redefine 'fast' for broadband in New Zealand | Corporate Website".company.chorus.co.nz.2019-11-18. Archived fromthe originalon 2020-01-19.
  16. ^"Oltre il GPON: Open Fiber supera il muro di 1Gigabit per secondo".Open Fiber(in Italian). 2019-03-14.Retrieved2024-08-27.
  17. ^"Open Fiber e Fibra City realizzano con ZTE la prima connessione XGS-PON in Italia".www.zteitalia.it(in Italian). 2019-03-18.Retrieved2024-08-27.
  18. ^"Open Fiber sempre più veloce: ora si viaggia a 10Giga".Open Fiber(in Italian). 2021-03-26.Retrieved2024-08-27.
  19. ^"Sperimentazione tecnica di rete FTTH in tecnologia XGS-PON".wdc.wholesale.telecomitalia.it(in Italian). 2021-03-23.
  20. ^Technical annex to wholesale offer
  21. ^"TIM porta in tv ad 'Amici' la fibra FTTH a 10 gigabits al secondo".
  22. ^"TIM porta a casa tua il primato della velocità: la Fibra fino a 10 giga".tim.it(in Italian). 2022-10-10.
  23. ^"DELTA komt met 8 Gig via glasvezel, 1 Gig wordt nieuwe standaard".delta.nl(in Dutch). 2021-08-05.Retrieved2021-08-12.
  24. ^"KPN switches to ultra-fast XGS-PON technology".overons.kpn.2021-09-01.Retrieved2022-06-21.
  25. ^"“NURO quang” に cá nhân hướng け10Gbpsサービス đăng tràng, nguyệt ngạch 9800 viên, “XG-PON” thải dụng ".INTERNET Watch.June 1, 2015.
  26. ^"Time offers 2Gbps fibre for RM379/month, first to commercially deploy 10G PON in Malaysia".SoyaCincau.Retrieved25 March2023.
  27. ^"Hoa vi x hương cảng điện tấn toàn cầu thủ thương dụng 10Gbps khoan tần".Archived fromthe originalon May 8, 2016.RetrievedDecember 11,2018.
  28. ^"Singtel, SuperInternet launch 10Gbps plans for home users".The Straits Times.February 3, 2016.
  29. ^"M1 Fibre Broadband 10Gbps".www.m1.com.sg.Archived fromthe originalon 2016-05-07.
  30. ^"Fiber Box".Salt.
  31. ^"Inea wprowadza internet o prędkości 10 Gb/s za 399 zł miesięcznie".www.wirtualnemedia.pl.12 October 2018.
  32. ^ab"Chorus' Hyperfibre set to redefine 'fast' for broadband in New Zealand | Corporate Website".company.chorus.co.nz.Retrieved2019-11-19.
  33. ^ab"Internet GIGANT stiže iz Orion telekoma | PC Press".2020-07-29.Retrieved2021-12-31.
  34. ^ab"Antik spúšťa 10 Gbps pevný internet: Poznáme cenu a dostupnosť | TOUCHIT".touchit.sk(in Slovak). 2021-05-25.Retrieved2021-05-25.
  35. ^ "Llega PRO-DIGI: la fibra más rápida del país va por libre".digi.es(in European Spanish). 2021-09-08.Retrieved2021-09-08.
  36. ^"DIGI lanseaza internetul de 10 Gbps – Fiberlink 10 G, cel mai rapid internet din Romania".digi.ro(in Romanian). 2021-09-30.Retrieved2021-09-30.
  37. ^"Multi-gig PON 101: Q&A with AT&T".2021-08-27.Retrieved2022-02-05.
  38. ^"Frontier Says it Has Deployed XGS-PON Fiber Broadband to 100K Homes".2021-09-23.Retrieved2022-02-14.
  39. ^"Quantum Fiber launches multi-gig service, delivering symmetric 8 gigabit internet speeds in select cities"(Press release). 2022-08-03.Retrieved2022-08-03.
  40. ^"Sonic Deploys Combined GPON and XGS-PON Platform in Oakland – Telecompetitor".www.telecompetitor.com.Retrieved2022-03-30.
  41. ^"Glo Fiber Launches 5 Gig Fiber Internet Service"(Press release). 2023-04-04.
  42. ^"Ziply Fiber starts next fiber upgrade wave, puts XGS-PON on roadmap".2021-08-11.Retrieved2022-02-05.
  43. ^"Bell set to deliver North America's fastest Internet speeds and Wi-Fi technology of any major provider".2022-08-02.Retrieved2022-10-01.
  44. ^Keaney, John (2022-10-06)."Why 10 Gigabits, Why Now?".SIRO.Retrieved2023-04-24.
  45. ^"PRO-DIGI 10 Gb – LA FIBRA MÁS RÁPIDA DEL PAÍS, VA POR LIBRE".Digi Espana.8 September 2021.Archivedfrom the original on 2021-09-08.
  46. ^"Orange rolls out XG-PON".www.csimagazine.com.17 August 2015.
  47. ^"M1 launches Singapore's first 2Gbps to 10Gbps GPON services".Archived fromthe originalon 2015-10-19.Press release
  48. ^"French B2B operator Netalis to launch 10 Gbps fibre service in Besancon, more locations to follow".www.telecompaper.com.
  49. ^Maala, Gracey (2021-12-22)."Converge gets its first live customer of 10GPON technology service » YugaTech | Philippines Tech News & Reviews".YugaTech | Philippines Tech News & Reviews.Retrieved2024-08-27.
  50. ^"New UK Full Fibre Broadband ISP Zzoomm Begins Network Testing".26 April 2019.
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