Overview
ISO/IEC/IEEE 8802-3:2021/Amd 11:2022 (IEEE 802.3cu™-2021) is an amendment to the Ethernet standard that specifies physical layer and management parameters for 100 Gb/s and 400 Gb/s Ethernet over single‑mode fiber (SMF) using 100 Gb/s per wavelength signaling. The amendment adds PMD (Physical Medium Dependent) definitions and management requirements for optical interfaces intended for reaches up to 10 km, enabling high‑capacity links for metro and data‑center interconnect applications.
Key topics and technical requirements
- Physical layer (PMD) specifications for 100 Gb/s and 400 Gb/s Ethernet over SMF at 100 Gb/s per wavelength.
- Support for modulation and signaling technologies referenced in the standard (keywords include PAM4 and forward error correction (FEC)).
- Management and monitoring parameters for optical interfaces and transceivers, including settings relevant to link behavior and diagnostics.
- Definitions of new or updated interface types commonly referenced by implementers (examples listed in the amendment: 100GBASE-FR1, 100GBASE-LR1, 400GBASE-FR4, 400GBASE-LR4‑6).
- Consideration of Energy‑Efficient Ethernet (EEE) behavior and power management as applicable to high‑speed optical links.
- Alignment with IEEE 802.3 structure and interoperability requirements to ensure consistent implementation across vendors.
(These topics are summarized from the amendment abstract and keywords; implementers should consult the full text for prescriptive technical parameters and test requirements.)
Practical applications and who uses this standard
- Network equipment vendors and transceiver manufacturers use this amendment to design optical modules and PMDs for 100 Gb/s Ethernet and 400 Gb/s Ethernet over SMF.
- Telecom carriers and metro network operators adopt these specifications for metro links and access networks up to 10 km.
- Data center architects and operators use compliant interfaces for data center interconnect (DCI) and campus aggregation where 100 Gb/s-per‑wavelength efficiency is needed.
- Test labs and certification bodies apply the management and optical specs for interoperability and compliance testing.
- Systems integrators and enterprise network planners reference the standard when specifying high‑speed fiber links and procurement requirements.
Related standards
- Part of the IEEE 802.3 family and adopted into ISO/IEC/IEEE 8802-3:2021. Related IEEE 802.3 amendments include 802.3cd, 802.3ca, 802.3cb, 802.3cm, 802.3cn, 802.3cg, 802.3cq, 802.3cr, and others addressing Ethernet physical layers and management.
- Implementers should review the base IEEE 802.3 standard and other PMD‑specific amendments for end‑to‑end interoperability and complementary requirements.
Keywords: 100 Gb/s Ethernet, 400 Gb/s Ethernet, 100GBASE-FR1, 100GBASE-LR1, 400GBASE-FR4, 400GBASE-LR4‑6, single‑mode fiber, PAM4, FEC, PMD, IEEE 802.3cu, Energy‑Efficient Ethernet (EEE).