Higher Speed PON

Higher Speed PON (also known as G.9804, HSP) is a family of ITU-T recommendations (computer networking standards) for data links, capable of delivering shared Internet access rates up to 50 Gbit/s (gigabits per second, Gbps).[1] Higher Speed PON is the first PON system to use digital signal processing, succeeding both single-channel XGS-PON and multi-channel NG-PON2.[2] It provides upgrade paths for legacy PON generations such as GPON, XG-PON, XGS-PON, and 10G-EPON.[3]

Higher Speed PON
Higher Speed Passive Optical Networks
AbbreviationG.9804
StatusIn force
Year started2018
Latest version1.0
November 2019
OrganizationITU-T
Base standards10G-PON, NG-PON2
DomainTelecommunication
LicenseFreely available
Websitehttps://www.itu.int/rec/T-REC-G.9804.1

Development

Following the publication of 40 Gbps NG-PON2 in July 2015, standardization activities turned to higher speed PON.[4] In November 2016, the Full Service Access Network (FSAN) Group released the Standards Roadmap 2.0 which indicated the development of "future optical access systems" with peak transmission rates above 10 Gbps.[5]

Concurrently, ITU-T Study Group 15 launched the G.sup.HSP project to study higher speed PON technologies, culminating in the publication of ITU-T G.sup.64 (G.sup.HSP) in February 2018.[6][7] Among possible nominal line rates of 20, 25, 50, and 100 Gbps per wavelength, the January 2018 Study Group 15 Plenary Meeting selected 50 Gbps as the next generation after 10 Gbps to provide a sufficiently large increment to network capacity while remaining technically feasible for network operators.[6]

The G.9804 standard series was established and intended to consist of four main recommendations. Recommendations G.9804.1 and G.9804.2 apply to all HSP systems, whereas G.9804.3 concerns physical medium dependent layer specifications for 50 Gbps PON (50G-PON) systems only.[6] Another recommendation, G.hsp.TWDMPMD, is under study in conjunction with IEEE working group P802.3.[8]

Standards

G.9804.1

G.9804.1 (G.hsp.req): Higher speed passive optical networks - Requirements serves as a guide for the development of higher speed PON systems by providing examples of "services, user network interfaces, and service node interfaces" required for higher speed networks,[9] such as higher speed single channel (TDMA-PON), higher speed multichannel (TWDM-PON), and higher speed point-to-point overlay PONs.[6] It provides requirements for backwards compatibility with the G.9807.x series covering GPON, XG(S)-PON, and 10G-EPON systems.[3] The standard achieved consent in July 2019,[6] was approved in November 2019, and was amended in August 2021.[9]

G.9804.2

G.9804.2 (G.hsp.comTC): Higher speed passive optical networks - Common transmission convergence layer specification defines the frame format and media access control method for exchange between optical line terminals (OLTs) and optical network units (ONUs) in higher speed networks. It is intended to support a variety of physical medium dependent (PMD) sublayers in all high speed PON systems and be future-proof.[3][10][11] It was approved in September 2021.[12]

G.9804.3

G.9804.3 (G.hsp.50Gpmd): 50-Gigabit-capable passive optical networks (50G-PON) - Physical media dependent (PMD) layer specification sets standards for the PMD sublayer of a 50 Gbps single-channel PON system (50G-PON) for residential, business, and mobile backhaul applications.[13] It was approved in September 2021.[14]

Technical requirements
General technical requirements[6]
Nominal line rate combination
Symmetric per channel 50 Gbps both downstream and upstream[lower-alpha 1]
Asymmetric 50 Gbps down, 25 Gbps up
50 Gbps down, 12.5 Gbps up
Wavelength bands
Downstream 1340~1344 nm
Upstream Wideband: 1260~1280 nm (GPON compatible)
Wideband: 1290~1310 nm (XG(S)-PON compatible)
Narrowband: 1298~1302 nm
Maximum fiber distance
General application 20 km
Latency-sensitive (e.g. 5G) 10 km
Power budget classes
Coexistence strategy Class Range (dB)
Multi-PON module (MPM) N114–29
C+17–32
Non-MPM[lower-alpha 2] N114–29
N216–31
E118–33
E220–35
  1. The upstream nominal line rate of 50 Gbps is left for further study.[13]
  2. Use cases using external coexistence elements (CEx) or direct optical distribution network (ODN) connection.[6]

Field trials
  • In September 2021, researchers from Huawei and China Telecom reported network carrier lab results of a 50G-PON prototype, achieving ~40 Gbps downstream speed, ~16 Gbps upstream speed, and ~80 μs of latency on a 10 km fiber link.[15]
  • In October 2021, Swisscom announced the successful implementation of 50 Gbps down- and 25 Gbps upstream transmission speeds on a fixed network connection in a real network environment by upgrading the OLT line card to a 50G-PON prototype.[16]

References
  1. "New ITU standards to boost Fibre to the Home from 10G to 50G". MyITU. ITU News. 10 June 2021. Archived from the original on 2021-06-15. Retrieved 2021-06-15.
  2. Roberts, Hal (2020-03-01). "Status of ITU-T Q2/15: New Higher Speed PON Projects". IEEE Communications Standards Magazine. 4 (1): 57–59. doi:10.1109/MCOMSTD.001.1900038. ISSN 2471-2833. S2CID 218565328. Archived from the original on 2021-07-07.
  3. ITU-T Study Group 15 (2021). "HSP: Higher Speed Passive Optical Networks" (PDF). International Telecommunication Union. Retrieved 2021-12-19.
  4. Koma, Ryo; Kani, Jun-ichi; Asaka, Kota; Suzuki, Ken-Ichi (10 October 2017). "Standardization Trends for Future High-speed Passive Optical Networks". NTT Technical Review. 15 (10). Retrieved 2021-12-25.
  5. "FSAN Roadmap". Full Service Access Network (FSAN) Group. Retrieved 2021-12-25.
  6. Zhang, Dezhi; Liu, Dekun; Wu, Xuming; Nesset, Derek (2020-10-01). "Progress of ITU-T higher speed passive optical network (50G-PON) standardization". IEEE/OSA Journal of Optical Communications and Networking. 12 (10): D99–D108. doi:10.1364/JOCN.391830. ISSN 1943-0639. S2CID 220074848.
  7. "ITU-T work programme: G.sup.64 (ex G.sup.HSP)". ITU. 2019-11-04. Retrieved 2021-12-25.
  8. "ITU-T work programme: G.hsp.TWDMpmd". ITU. 2021-05-03. Retrieved 2021-12-25.
  9. "G.9804.1: Higher speed passive optical networks - Requirements". International Telecommunication Union. Archived from the original on 2021-06-15. Retrieved 2021-06-15.
  10. Effenberger, Frank (8 June 2021). ITU INTERVIEWS: Frank J. Effenberger, Rapporteur, Question 2/15, ITU-T Study Group 15. ITU. Retrieved 2021-06-15.
  11. "ITU-T work programme: G.9804.2 (ex G.hsp.comTC)". ITU. 2021-05-03. Retrieved 2021-12-19.
  12. "G.9804.2 : Higher speed passive optical networks - Common transmission convergence layer specification". International Telecommunication Union. Retrieved 2021-12-19.
  13. "ITU-T work programme: G.9804.3 (ex G.hsp.50Gpmd)". ITU. 2021-05-03. Retrieved 2021-12-23.
  14. "G.9804.3: 50-Gigabit-capable passive optical networks (50G-PON): Physical media dependent (PMD) layer specification". International Telecommunication Union. Retrieved 2021-12-19.
  15. Zhang, Dezhi; Liu, Dekun; Nesset, Derek; Wu, Xuming; Ming, Jiang (22 November 2021). "Carrier Lab Trial of a Real Time 50G-PON Prototype". 2021 European Conference on Optical Communication (ECOC). IEEE. pp. 1–4. doi:10.1109/ECOC52684.2021.9605843. ISBN 978-1-6654-3868-1. S2CID 244493949. Retrieved 2021-12-25.
  16. Hüsler, Esther (8 October 2020). "50 Gbit/s on a fixed network connection – a world first!". Swisscom. Retrieved 2021-12-25.
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