Arista QSFP-200G-FR4-Arista | 200G QSFP56 Transceiver, Single-Mode, 2km, Duplex LC

Q: Can this transceiver operate at 100G speeds?
A: Yes, the QSFP-200G-FR4 is dual-rate and supports both 200G and 100G operation. When configured for 100G, it optically interoperates with 100GBASE-CWDM4 transceivers, allowing phased network upgrades without replacing fiber infrastructure.

Q: What fiber type is required for this transceiver?
A: This module requires single-mode fiber (SMF) with duplex LC/UPC connectors. It uses the same fiber type and connectors as 100G CWDM4/LR4 optics, enabling simple migration from 100G to 200G without changes to existing fiber plant.

Q: Is this transceiver compatible with QSFP-DD ports?
A: Yes, QSFP56 modules like the QSFP-200G-FR4 can be used in QSFP-DD ports when the port is configured for 200G operation. However, note that this module has higher power requirements (up to 6.5W) compared to other 200G options.

Q: What is the difference between FR4 and SR4 for 200G?
A: The FR4 uses single-mode fiber with duplex LC connectors and reaches 2km, while SR4 uses multimode fiber with MPO-12 connectors for shorter distances (70m-100m). FR4 is preferred for longer data center interconnects and campus networks.

Q: Does this transceiver support Forward Error Correction (FEC)?
A: Yes, FEC is required for reliable 200G operation with PAM4 modulation. The transceiver complies with IEEE 802.3cd standards which specify KP4-FEC for 200GBASE-FR4 applications, ensuring signal integrity over the 2km distance.