Specifications, compatibility and ordering information
The 400G QSFP-DD SR8 optical transceiver is a short-reach parallel multimode module for 400 Gigabit Ethernet links, using eight PAM4 optical channels at 850nm with a single MPO-16/APC interface. It supports links up to 70m over OM3 and 100m over OM4 fiber with FEC. For data center expansion and high-density switch deployments, this product belongs to the 400G optical transceiver range where the host port, multimode cabling and optical interface need to be confirmed together rather than selecting a module by data rate alone.
SR8 is particularly sensitive to the installed fiber path. A project specified for duplex LC optics or single-mode cabling cannot simply substitute this module because the QSFP-DD form factor is the same. Before a volume order is approved, buyers should confirm that the target switch or router supports 400GBASE-SR8, that the installed link uses the required multimode fiber and MPO-16 interface, and that any platform-specific coding or compatibility requirements are defined. The required reach should also be checked against the actual OM3 or OM4 link rather than treating “100m” as a universal distance for every multimode installation.
The purchase order should keep the approved technical configuration and commercial requirements together. Quantity, module labeling, packaging, required documentation, compatibility programming, delivery arrangement and payment terms should be agreed before production or shipment. When the modules arrive, incoming inspection should verify the product identification, QSFP-DD form factor, MPO interface, SR8 designation, quantity and agreed coding or labeling against the approved order before the batch is released for network installation.
400G QSFP-DD SR8 Specifications
The specifications below cover the optical interface, transmission reach and operating parameters that are most relevant when matching this module to an existing 400G multimode link.
| Specification | Value |
|---|---|
| Data Rate | 400G Ethernet, 425Gbps aggregate |
| Form Factor | QSFP-DD |
| Optical Standard | 400GBASE-SR8 |
| Optical Architecture | 8-channel full-duplex parallel optics |
| Modulation | PAM4 |
| Wavelength | 850nm |
| Fiber Type | Multimode Fiber |
| Transmission Distance | Up to 70m on OM3 / 100m on OM4 with FEC |
| Optical Interface | Single MPO-16/APC receptacle |
| Operating Case Temperature | 0°C to 70°C |
| Power Supply | 3.3V |
| Maximum Power Dissipation | <10W |
| Digital Diagnostics | Supported, CMIS 4.0 management interface |
| Standards | IEEE 802.3cm 400GBASE-SR8, IEEE 802.3bs 400GAUI-8, QSFP-DD MSA |
For bulk procurement, the main risk is ordering the correct 400G module but for the wrong fiber infrastructure. The approved specification should therefore keep SR8, MPO-16/APC, multimode fiber and the required OM3 or OM4 reach tied to the target host platform. After delivery, those same items provide a practical basis for checking that the received batch matches the configuration approved for the project before installation begins.
