10G-PON explained

10G-PON
Long Name:10-Gigabit-capable passive optical network (XG-PON & XGS-PON)
Status:In force
Year Started:2010
Version:3.0
Version Date:June 2012
Organization:ITU-T
Related Standards:NG-PON2, Higher Speed PON
Abbreviation:G.987
Domain:Telecommunication
License:Freely available
Website:https://www.itu.int/rec/T-REC-G.987

10G-PON (also known as XG-PON or G.987) is a 2010 computer networking standard for data links, capable of delivering shared Internet access rates up to 10 Gbit/s (gigabits per second) over existing dark fiber. This is the ITU-T's next-generation standard following on from GPON or gigabit-capable PON. Optical fibre is shared by many subscribers in a network known as FTTx in a way that centralises most of the telecommunications equipment, 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 in access networks, and sometimes also in large optical local networks for fibre-to-the-desk.[1]

Passive optical networks are used for the fibre-to-the-home or fibre-to-the-premises last mile with 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 as Ethernet and wired analogue plain 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 uses time division multiplexing (TDM) and time division multiple access (TDMA).[4]

Standards

ITU-T G.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-mode lasers on optical 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 a WDM 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 is G.984.[7] This compares to the IEEE 802.3av standard for 10G-EPON based on Ethernet, 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

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

G.988

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.

ONU equipment

The optical network unit (ONU) supplies network services from the PON to customer premises, connecting customer-premises equipment such as a home gateway or office firewall. An optical network terminal (ONT) is an ONU that functions as a demarcation point servicing a single subscriber; e.g., a dwelling or office. ONU devices supply Ethernet and possibly other services to the users, either directly (by bridging) or through a gateway device such as a residential gateway, firewall, and/or router, POTS, CATV signals to buildings wired for RF video, and some may even be compatible with the emerging G.hn home 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. TDMA time slots prevent collisions with upstream traffic from other users sharing the same physical PON.

Fibre-to-the-cell site is another emerging application, but has extra synchronisation requirements. A specialised cellular backhaul unit (CBU) can provide PON access for cellular networks.

OLT and access nodes

The OLT (optical line terminal) connects the PON to aggregated backhaul uplinks, 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 the central office (CO), which uses special uplink cards for Ethernet backhaul 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 in outside plant cabinets 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

PON optical distribution networks use single-mode optical fibre in the outside plant, optical splitters and optical 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 splitters creating a point to multipoint topology 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."

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.

Field trials

Home Internet service providers

Commercial Internet service providers

See also

External links

Notes and References

  1. Web site: ITU. 2018-12-22. ITU brings new clarity to 5G transport. live. https://web.archive.org/web/20210405115206/https://news.itu.int/5g-transport-new-clarity/. 2021-04-05. 2021-04-05. ITU News. english.
  2. Web site: XG-PON or XGS-PON: don't make a costly spelling mistake. www.nokia.com.
  3. Web site: G.9807.1 : 10-Gigabit-capable symmetric passive optical network (XGS-PON) .
  4. Web site: 10 GBPS Symmetrical with XGS-PON | . 25 May 2019 .
  5. Web site: 10-Gigabit-capable passive optical networks (XG-PON): General requirements . International Telecommunication Union . January 13, 2010 . G.987 . May 7, 2011 .
  6. Dahlfort . Stefan . 2009-09-22 . Comparison of 10 Gbit/s PON vs WDM-PON . ECOC 2009 .
  7. http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.984.1-200803-I!!PDF-E&type=items G.984.1: Gigabit-capable passive optical networks (G-PON): General characteristics
  8. Web site: Overview of 10Gb/s EPON Status, Requirements and Applications . 2018-11-26 . https://web.archive.org/web/20101010184804/http://www.ethernetalliance.org/files/static_page_files/ACF586A4-1D09-3519-ADAC82B586E5A655/10GEPON_WP_EA_from%20FC_Final_updated_V2d4.pdf . 2010-10-10 . dead . Chang . Frank . Kramer . Glen . Hajduczenia . Marek . Mandin . Jeff . Yoon . Bin Yeong .
  9. http://www.chaffeefiberoptics.com/nwsltr/ftthprismv7n2a.pdf George, John. "PONs Can Keep Pace with Exploding Bandwidth Demand" - FTTH Prism: Vol. 7, No. 2, July 2010
  10. Web site: 10G EPON- Unleashing the Bandwidth Potential . Telecom Asia . ZTE Corporation . 2022-05-08 . https://web.archive.org/web/20170829150209/https://www.telecomasia.net/pdf/ZTE/ZTE_101909.pdf . 2017-08-29 . 2009-08-04 . live.
  11. Web site: 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 . 2018-11-26 . https://web.archive.org/web/20110708133350/http://www.chaffeefiberoptics.com/nwsltr/ftthprismv7n2a.pdf . 2011-07-08 . dead .
  12. Web site: 10 GBPS Symmetrical with XGS-PON | . 25 May 2019 .
  13. http://www.lightreading.com/blog.asp?blog_sectionid=384&doc_id=199360& BBWF 2010: Huawei's 10G GPON Coup
  14. Total Telecom
  15. https://company.chorus.co.nz/chorus-hyperfibre-set-redefine-fast-broadband-new-zealand Chorus media release
  16. https://openfiber.it/mondo-open-fiber/comunicati-stampa/oltre-il-gpon-open-fiber-supera-il-muro-di-1gigabit-per-secondo/ OpenFiber press release (in Italian)
  17. http://www.zteitalia.it/2019/03/18/open-fiber-e-fibra-city-realizzano-con-zte-la-prima-connessione-xgs-pon-in-italia/ ZTE Italy press release (in Italian)
  18. https://openfiber.it/mondo-open-fiber/comunicati-stampa/open-fiber-10-giga/ OpenFiber press release (in Italian)
  19. https://wdc.wholesale.telecomitalia.it/tw_news/2021/03/23/sperimentazione-tecnica-di-rete-ftth-in-tecnologia-xgs-pon/ TIM Wholesale info page
  20. https://storage.googleapis.com/tim_media_prod/2021/03/Allegato-news-del-23mar2021.pdf Technical annex to wholesale offer
  21. Web site: TIM porta in tv ad 'Amici' la fibra FTTH a 10 gigabits al secondo.
  22. Web site: 2022-10-10. TIM porta a casa tua il primato della velocità: la Fibra fino a 10 giga. tim.it. it-IT.
  23. Web site: 2022-08-18. Smart Infra provides now speeds of 10 Gbps.
  24. Web site: 2021-08-05. DELTA komt met 8 Gig via glasvezel, 1 Gig wordt nieuwe standaard. 2021-08-12. delta.nl. nl-NL.
  25. Web site: 2021-09-01. KPN switches to ultra-fast XGS-PON technology. 2022-06-21. overons.kpn. en-EN.
  26. Web site: 「NURO 光」に個人向け10Gbpsサービス登場、月額9800円、「XG-PON」採用. June 1, 2015. INTERNET Watch.
  27. News: Time offers 2Gbps fibre for RM379/month, first to commercially deploy 10G PON in Malaysia . 25 March 2023 . SoyaCincau.
  28. Web site: 華為x香港電訊 全球首商用10Gbps寬頻 . December 11, 2018 . May 8, 2016 . https://web.archive.org/web/20160508162117/http://www.itpromag.com/%E8%8F%AF%E7%82%BAx%E9%A6%99%E6%B8%AF%E9%9B%BB%E8%A8%8A-%E5%85%A8%E7%90%83%E9%A6%96%E5%95%86%E7%94%A810gbps%E5%AF%AC%E9%A0%BB-14516 . dead .
  29. Web site: Singtel, SuperInternet launch 10Gbps plans for home users. February 3, 2016. The Straits Times.
  30. Web site: M1 Fibre Broadband 10Gbps. www.m1.com.sg. https://web.archive.org/web/20160507172445/https://www.m1.com.sg/personal/home-broadband/10gbps. 2016-05-07.
  31. Web site: Fiber Box. Salt..
  32. Web site: Inea wprowadza internet o prędkości 10 Gb/s za 399 zł miesięcznie. www.wirtualnemedia.pl. 12 October 2018 .
  33. Web site: Chorus' Hyperfibre set to redefine 'fast' for broadband in New Zealand Corporate Website. company.chorus.co.nz. 2019-11-19.
  34. Web site: 2020-07-29. Internet GIGANT stiže iz Orion telekoma PC Press. 2021-12-31. en-US.
  35. Web site: 2021-05-25. Antik spúšťa 10 Gbps pevný internet: Poznáme cenu a dostupnosť TOUCHIT. 2021-05-25. touchit.sk. sk-SK.
  36. Web site: 2021-09-08. Llega PRO-DIGI: la fibra más rápida del país va por libre. 2021-09-08. digi.es. es-ES.
  37. Web site: 2021-09-30. DIGI lanseaza internetul de 10 GbpsFiberlink 10 G, cel mai rapid internet din Romania. 2021-09-30. digi.ro. ro-RO.
  38. Web site: 2021-08-27. Multi-gig PON 101: Q&A with AT&T. 2022-02-05.
  39. Web site: 2021-09-23 . Frontier Says it Has Deployed XGS-PON Fiber Broadband to 100K Homes . 2022-02-14.
  40. 2022-08-03 . Quantum Fiber launches multi-gig service, delivering symmetric 8 gigabit internet speeds in select cities . 2022-08-03.
  41. Web site: Sonic Deploys Combined GPON and XGS-PON Platform in OaklandTelecompetitor . 2022-03-30 . www.telecompetitor.com.
  42. 2023-04-04. Glo Fiber Launches 5 Gig Fiber Internet Service.
  43. Web site: 2021-08-11. Ziply Fiber starts next fiber upgrade wave, puts XGS-PON on roadmap. 2022-02-05.
  44. Web site: 2022-08-02. Bell set to deliver North America's fastest Internet speeds and Wi-Fi technology of any major provider. 2022-10-01.
  45. Web site: Keaney . John . 2022-10-06 . Why 10 Gigabits, Why Now? . 2023-04-24 . SIRO . en-US.
  46. Web site: 8 September 2021. PRO-DIGI 10 GbLA FIBRA MÁS RÁPIDA DEL PAÍS, VA POR LIBRE. live. Digi Espana. https://web.archive.org/web/20210908115148/https://www.digimobil.es/fibra-optica/pro-digi/10gb . 2021-09-08 .
  47. Web site: Orange rolls out XG-PON. www.csimagazine.com. 17 August 2015 .
  48. Web site: M1 launches Singapore's first 2Gbps to 10Gbps GPON services. https://web.archive.org/web/20151019000311/https://www.m1.com.sg/AboutM1/NewsReleases/2015/M1%20launches%20Singapore%20first%202Gbps%20to%2010Gbps%20GPON%20services.aspx. 2015-10-19. Press release
  49. Web site: French B2B operator Netalis to launch 10 Gbps fibre service in Besancon, more locations to follow. www.telecompaper.com.
  50. https://www.yugatech.com/news/converge-gets-its-first-live-customer-of-10gpon-technology-service/
  51. Web site: New UK Full Fibre Broadband ISP Zzoomm Begins Network Testing . 26 April 2019 .

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