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400 Gigabit Ethernet (400GbE or 400G Ethernet) is Ethernet operation at a 400 Gb/s Media Access Control (MAC) data rate. It is a rate within the IEEE 802.3 Ethernet standard family—not a specification for one particular cable, optical transceiver, or link distance.
What does the 400 Gb/s figure measure?
The figure describes the Ethernet MAC data rate, not necessarily the application throughput a user will see. Ethernet frames carry protocol overhead, and delivered application throughput also depends on the traffic mix, equipment configuration, and the rest of the link path. IEEE 802.3 defines a common MAC framework and management information base (MIB), while physical-layer specifications (PHYs) provide options suited to different media and link conditions. IEEE 802.3-2022 describes Ethernet LAN operation through 400 Gb/s.
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How did 400GbE become part of Ethernet?
IEEE 802.3bs-2017 added MAC parameters, PHY specifications, and management parameters for transferring Ethernet-format frames at 200 Gb/s and 400 Gb/s. The IEEE 802.3 task force record gives the IEEE-SA approval date as December 6, 2017; the amendment record lists its publication date as December 12, 2017. These are separate milestones.
IEEE now lists 802.3bs-2017 as superseded. The consolidated 802.3-2022 overview describes Ethernet operation through 400 Gb/s, so 802.3bs is best understood as the originating amendment rather than the latest consolidated standard. IEEE 802.3 P802.3bs Task Force
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What kinds of 400GbE physical links are there?
“400G” alone does not identify the medium or how far a link can run. IEEE 802.3 includes PHY options for fiber and electrical media. Optical examples illustrate why the specific PHY matters:
- Single-mode fiber: An IEEE amendment record describes 400 Gb/s optical interfaces for reaches up to 10 km, using 100 Gb/s per-wavelength optical signaling. IEEE/ISO/IEC 8802-3:2021/Amd 11-2021
- Multimode fiber: IEEE lists 400GBASE-SR4.2 and 400GBASE-SR8 multimode-fiber physical media dependent (PMD) options for reaches of at least 100 m. IEEE 802.3 standards activities and approved projects
These are distinct physical-layer options, not interchangeable descriptions of one universal 400G link. The stated reach applies to the specified interface and medium; it does not establish that every 400GbE device or optic can reach that distance.
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What should you check when choosing a 400GbE link?
Match the physical link and both ends of the connection, rather than relying on the 400G label alone. Check:
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall- The required link reach and the PHY standard intended for it.
- The medium—such as single-mode fiber, multimode fiber, or an electrical connection—and the required fiber type where applicable.
- The number and rate of lanes or optical wavelengths, where relevant to the selected PHY.
- Connector requirements and whether the host port supports the proposed interface.
- Compatibility and interoperability with the actual equipment at both ends.
A 400G optical transceiver is only a suitable category of component if its PHY, fiber, reach, connector, and host-device support match the link. The IEEE standards cited here define interface options; they do not certify a particular retail product or establish universal compatibility.
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- GIGABIT ETHERNET PORTS: Features 8 x 1.0Gbps Ethernet ports for high-speed connectivity. Auto-negotiating ports detect the optimal speed for connected devices and work with existing Cat5e or Cat6 Ethernet cables.
- PLUG-AND-PLAY UNMANAGED NETWORK SWITCH: Simple plug-and-play setup with no software to install or configuration required.
- FLEXIBLE MOUNTING OPTIONS: Compact metal design supports desktop or wall-mount placement for versatile installation.
- SILENT & ENERGY-EFFICIENT OPERATION: Fanless design ensures silent performance, while IEEE 802.3az Energy Efficient Ethernet reduces power consumption without compromising high-speed network performance.
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