Arista OSFP-400G-FR4-Arista | 400G OSFP Transceiver, Single-Mode, 2km, LC, 1310nm

Q: What is the difference between 400G FR4 and DR4 transceivers?
A: FR4 uses four 100G optical channels multiplexed onto a single fiber pair with duplex LC connectors, supporting up to 2km reach over SMF. DR4 uses four separate fiber pairs with MPO-12 connectors and supports up to 500m reach. FR4 is ideal for longer campus and data center interconnect applications.

Q: Is the OSFP-400G-FR4 compatible with QSFP-DD ports?
A: No, OSFP and QSFP-DD are different physical form factors with different port sizes. While both support 400G speeds, they are not mechanically interchangeable. Arista offers both OSFP and QSFP-DD versions of 400G transceivers to match different platform requirements.

Q: Can this transceiver be used in breakout mode?
A: No, the 400G-FR4 transceiver is designed as a single 400G port solution. Its four optical channels are multiplexed together to provide one 400G link. For breakout applications to 4x 100G, consider DR4 or other parallel optics with separate fiber channels.

Q: What type of fiber cable is required for this module?
A: The OSFP-400G-FR4 requires OS2 single-mode fiber with duplex LC connectors. Standard duplex LC patch cables rated for single-mode use will work. Maximum transmission distance is 2km over SMF.

Q: Does this module require any special licensing on Arista switches?
A: No additional optics licensing is required. The OSFP-400G-FR4 is a standard pluggable transceiver that works with any Arista platform supporting OSFP form factor and 400G speeds, subject to the platform's software and feature licensing.