OSFP-400G-VR4: Frequently Asked Questions
Q: What is the main connectivity solution for the OSFP-400G-VR4?
A: The OSFP-400G-VR4 is designed for short-reach 400G Ethernet connectivity in data centers and AI networking environments. It can be deployed in compatible OSFP ports on NVIDIA ConnectX-7 adapters, with the opposite end connecting to OSFP-800G-2xSR4 optical modules on 800G OSFP switches, subject to host and link compatibility.
Q: What is the maximum transmission distance of the OSFP-400G-VR4?
A: The OSFP-400G-VR4 supports transmission distances of up to 60 meters over OM3 multimode fiber (MMF) or 50 meters over OM4 MMF. Actual link performance depends on fiber quality, connector condition, and the optical specifications of the connected equipment.
Q: What is the difference between OSFP-400G-VR4, QSFP112-400G-VR4, and QSFP-DD-400G-VR4?
A: These modules can provide 400G VR4 optical connectivity, but they use different electrical interfaces and physical form factors. OSFP-400G-VR4 and QSFP112-400G-VR4 typically use four 100G-class electrical lanes, while QSFP-DD-400G-VR4 implementations may use eight 50G-class electrical lanes. All three require compatible host interfaces and matching optical specifications. Confirm the specific module datasheets before selecting a replacement or interconnecting equipment.
Q: Can OSFP, QSFP-DD, and QSFP112 optical modules be interconnected?
A: Yes, modules in different form factors can interoperate when their optical interfaces, wavelength, modulation, lane mapping, connector type, and transmission specifications are compatible. For example, compatible 400G VR4 modules can establish an optical link across different form factors when the host equipment supports the selected modules and link configuration.
Q: Can an OSFP-400G-VR4 module be installed directly in a QSFP-DD port?
A: No. OSFP and QSFP-DD are physically different form factors, so an OSFP-400G-VR4 cannot be inserted directly into a QSFP-DD port. Select a module that matches the host port’s physical interface and supports the required 400G optical link.
Q: Can a 400G VR4 module connect to an 800G Twin-Port 2xVR4 optical module?
A: Yes, provided the 800G Twin-Port 2xVR4 module is designed to support two independent 400G optical links. Each 400G VR4 link must use a compatible MPO-12 multimode fiber connection with the correct polarity and connector type. Verify whether the modules require MPO-12 or MPO-12/APC connectors and confirm the fiber grade and link specifications before deployment.
Q: What fiber type and connector are required for the OSFP-400G-VR4?
A: The OSFP-400G-VR4 is designed for multimode fiber applications, supporting OM3 and OM4 fiber within the specified transmission distances. The required MPO connector type, polish, and polarity must match the module datasheet and the installed fiber infrastructure.
Q: Does the OSFP-400G-VR4 support Digital Diagnostic Monitoring (DDM)?
A: DDM support depends on the specific module implementation. For SFPPlaza OSFP-400G-VR4 modules equipped with DDM, users can monitor supported operating parameters through compatible host equipment and management interfaces. Please refer to the product datasheet for the available diagnostic functions.
