IEEE 802.3ch
“IEEE Standard for Ethernet Amendment: Physical Layer Specifications and Management Parameters for 2.5 Gb/s, 5 Gb/s, and 10 Gb/s Automotive Electrical Ethernet” is currently under development by the IEEE P802.3ch Multi‑Gig Automotive Ethernet PHY Task Force and anticipated to publish in September, 2020. Innovation in automotive technology is rapidly accelerating to accommodate driver assist, autonomous driving, and other advanced systems and support of greater than 1 Gb/s date rates over a lightweight cabling infrastructure will be required for these emerging applications. This project will define three Physical Layer (PHY) specifications and management parameters for 2.5 Gb/s, 5 Gb/s, and 10 Gb/s operation over an automotive link segment consisting of a single balanced pair of conductors and up to four in‑line connectors. Optional auto‑negotiation ability between 2.5GBASE‑T1, 5GBASE‑T1, and 10GBASE‑T1 will support backwards compatibility and allow upgrades and component additions to be made as needed in the highly cost-sensitive automotive market.
The three new PHY specifications are as follows:
2.5GBASE-T1: 2.5 Gb/s Ethernet (full duplex) over a single balanced pair of conductors, with reach up to at least 15 m
5GBASE-T1: 5 Gb/s Ethernet (full duplex) over a single balanced pair of conductors, with reach up to at least 15 m
10GBASE-T1: 10 Gb/s Ethernet (full duplex) over a single balanced pair of conductors, with reach up to at least 15 m
The IEEE 802.3 Multi-Gig Automotive Ethernet PHY Call-For-Interest Consensus Presentation can be found here: http://www.ieee802.org/3/cfi/1116_1/CFI_01_1116.pdf
The current focus of the IEEE P802.3ch Multi-Gig Automotive Ethernet PHY Task Force is circulation of their draft document for SA (Standards Association) ballot review and comment resolution.
The Project Authorization Request (PAR), approved on May 18, 2017, can be found here: http://www.ieee802.org/3/NGAUTO/P802.3ch.pdf
The project objectives, adopted on March 16, 2017, (refer to: http://www.ieee802.org/3/NGAUTO/0317_approved_objectives_3NGAUTO.pdf) are as follows:
- Preserve the IEEE 802.3/Ethernet frame format at the MAC client service interface
- Preserve minimum and maximum frame size of the current IEEE 802.3 standard
- Support full duplex operation only
- Define optional startup procedure which enables the time from power_on=FALSE to a state capable of transmitting and receiving valid data to be less than 100ms
- Support data rates of 2.5 Gb/s, 5 Gb/s and 10 Gb/s at the MAC/PLS service interface
- Support a BER better than or equal to 10-12 at the MAC/PLS service interface (or the frame loss ratio equivalent)
- Support optional Auto-Negotiation
- Support optional Energy Efficient Ethernet
- Support operation in automotive environments (e.g., EMC, temperature)
- Do not preclude meeting FCC and CISPR EMC requirements
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