IEEE 802.3cp
“IEEE Standard for Ethernet Amendment: Bidirectional 10 Gb/s, 25 Gb/s, and 50 Gb/s Optical Access PHYs” is currently under development by the IEEE P802.3ct Bidirectional 10 Gb/s, 25 Gb/s, and 50 Gb/s Optical Access PHYs Task Force and anticipated to publish in July, 2021. Network operators who currently use bidirectional optics in their access networks require higher speed optical fiber access Ethernet to support FTTBusiness, FTTHome, and wireless front haul and back haul applications. This project will define twelve Physical Layer (PHY) specifications that support 10 Gb/s, 25 Gb/s, and 50 Gb/s bidirectional operation over a single strand of single-mode optical fiber over reaches of 10 km, 20 km, 40 km, and greater than 40 km. These solutions will support optional Energy Efficient Ethernet (EEE).
The twelve new PHY specifications are:
10GBASE-BR10: 10 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 10 km
10GBASE-BR20: 10 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 20 km
10GBASE-BR40: 10 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km
10GBASE-BR40+: 10 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km with an increased loss budget
25GBASE-BR10: 25 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 10 km
25GBASE-BR20: 25 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 20 km
25GBASE-BR40: 25 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km
25GBASE-BR40+: 25 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km with an increased loss budget
50GBASE-BR10: 50 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 10 km
50GBASE-BR20: 50 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 20 km
50GBASE-BR40: 50 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km
50GBASE-BR40+: 50 Gb/s bidirectional Ethernet over one strand of single-mode fiber, with reach up to at least 40 km with an increased loss budget
The IEEE 802.3 10 Gb/s, 25 Gb/s, and 50 Gb/s Optical Access PHYs Call-For-Interest Consensus Presentation can be found here: http://www.ieee802.org/3/NGBIDI/public/1803/BiDi10+25GAccessPHYs_Mar5.pdf
The current focus of the IEEE P802.3ct Bidirectional 10 Gb/s, 25 Gb/s, and 50 Gb/s Optical Access PHYs Task Force is circulation of their draft document for Working Group ballot review and comment resolution.
The Project Authorization Request (PAR), approved on December 5, 2018, can be found here: https://mentor.ieee.org/802-ec/dcn/18/ec-18-0175-00-00EC-ieee-p802-3cp-draft-par.pdf
The project objectives, adopted on November 15, 2018, (refer to: http://www.ieee802.org/3/cp/180911_802d3_OBJ_BiDi_v2.pdf) are as follows:
- Support full-duplex operation only
- Support bidirectional transmission over a single strand of single-mode fiber using a single wavelength in each direction
- Support MAC data rates of 10 Gb/s, 25 Gb/s, and 50 Gb/s
- Support distances of at least 10 km, at least 20 km, and at least 40 km
- Preserve the Ethernet frame format utilizing the Ethernet MAC
- Support a BER of better than or equal to 10-12 at the MAC/PLS service interface (or the frame loss ratio equivalent)
- Support optional Energy-Efficient Ethernet operation
- Support silent start* operation to prevent bidirectional PHYs interfering with Point-to-Multipoint (P2MP) networks
* Silent start means that the upstream-facing PHY does not transmit unless a valid downstream signal is received. This prevents the bidirectional PHY from jamming transmission on the P2MP network in cases of unintentional connection.
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