Arista OSFP-400G-PLR4-S | 400G PLR4 Transceiver, Single-Mode, 10km, MPO-12

Q: What is the difference between OSFP-400G-PLR4 and OSFP-400G-PLR4-S?
A: The OSFP-400G-PLR4-S features SN (Short Nose) optical connectors, which offer a more compact MPO-12 APC interface compared to the standard OSFP-400G-PLR4. Both provide 400GBASE-PLR4 performance over 10km single-mode fibre, but the -S variant is optimized for high-density environments with space constraints.

Q: Can this transceiver break out to 100G ports?
A: Yes, the OSFP-400G-PLR4-S supports 4x 100GBASE-LR breakout, allowing a single 400G OSFP port to connect to four individual 100G-LR QSFP28 or QSFP-DD modules. This flexibility is ideal for incremental network upgrades and mixed-speed deployments.

Q: What fibre type is required for this transceiver?
A: This transceiver requires single-mode fibre (SMF OS2, 9/125µm) with an MPO-12 APC connector. It supports up to 10km transmission distance, making it suitable for inter-building or campus backbone links.

Q: Is this transceiver compatible with non-Arista switches?
A: While designed for Arista platforms, MSA-compliant versions of this transceiver are available from third-party vendors and may work with other vendors' equipment that supports 400GBASE-PLR4. Always verify compatibility with your specific switch model and firmware before deployment.

Q: What management and diagnostic features are supported?
A: The transceiver supports CMIS 4.0 management interface with full Digital Optical Monitoring (DOM), providing real-time access to temperature, voltage, transmit/receive optical power, and laser bias current. This enables proactive monitoring and troubleshooting of optical link health.