IEEE 802.3ca
“IEEE Standard for Ethernet Amendment: Physical Layer Specifications and Management Parameters for 25 Gb/s and 50 Gb/s Passive Optical Networks” is currently under development by the IEEE P802.3ca 50G‑EPON Task Force and anticipated to publish in August, 2020. Ethernet Passive Optical Network (EPON) is a universal outside plant architecture that provides network access in residential, business, and Wi‑Fi/cellular backhaul applications. Not only is 10G‑EPON capacity predicted to be insufficient in dense environments such as multi-dwelling units, but EPON must continue to evolve to meet changing requirements, satisfy increasing access demands, and support new markets and applications. This project will define two Physical Layer (PHY) specifications that support 25 Gb/s and 50 Gb/s EPON operation over a single strand of single-mode optical fiber.
The two new EPON architectures are as follows:
25G-EPON: An EPON architecture supporting a maximum sustained throughput of 25 Gb/s in either downstream or both downstream and upstream directions. This term collectively refers to 25/10G‑EPON and 25/25G‑EPON architectures.
50G-EPON: An EPON architecture supporting a maximum sustained throughput of 50 Gb/s in either downstream or both downstream and upstream directions. This term collectively refers to 50/10G‑EPON, 50/25G‑EPON, and 50/50G‑EPON architectures.
The IEEE 802.3 NG-EPON Call-For-Interest Consensus Presentation can be found here: http://www.ieee802.org/3/cfi/0715_1/CFI_01_0715.pdf
The current focus of the IEEE P802.3ca 50G‑EPON Task Force is circulation of their draft document for SA (Standards Association) ballot review and comment resolution.
The Project Authorization Request (PAR), approved on December 5, 2018, can be found here: http://www.ieee802.org/3/ca/documents/P802_3ca_PAR_approved.pdf
The project objectives, adopted on July 12, 2018, (refer to: http://www.ieee802.org/3/ca/documents/P802_3ca_objectives.pdf) are as follows:
- Support subscriber access networks using point-to-multipoint topologies on optical fiber
- Provide Physical Layer specifications that:
- Operate over a single SMF strand
- Support symmetric and/or asymmetric MAC data rates of:
- 25 Gb/s in downstream and 10 Gb/s or 25 Gb/s in upstream (25G‑EPON)
- 50 Gb/s in downstream and 10 Gb/s, 25 Gb/s, or 50 Gb/s in upstream (50G‑EPON)
- Have a BER better than or equal to 10-12 at the MAC/PLS service interface (or the frame loss ratio equivalent)
- Support coexistence with select legacy PON technologies
- Optical power budgets to accommodate channel insertion losses equivalent to PR20 and PR30, as defined in Clause 75
- Wavelength allocation allowing concurrent operation with 10G‑EPON, XG‑PON1, and XGS‑PON PHYs (1575nm‑1580nm downstream, 1260nm‑1280nm upstream)
- Wavelength allocation allowing concurrent operation of 25G‑EPON and G‑PON reduced wavelength set (1480nm‑1500nm downstream, 1290nm‑1330nm upstream) PHYs
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