Arista QSFP-100G-SR1 | 100G Transceiver, BiDi, 100m, Duplex LC, MMF

Q: What is the difference between 100GBASE-SR1.2 and standard SR4 transceivers?
A: The SR1.2 BiDi uses only two fibers via duplex LC connectors with dual wavelengths (850nm/910nm), while SR4 requires 8 fibers via MPO connectors. SR1.2 allows reuse of existing duplex fiber infrastructure, making upgrades from 10G or 40G more cost-effective without replacing cabling.

Q: Does this transceiver support 400G breakout connectivity?
A: Yes, the QSFP-100G-SR1 can connect to 400G BiDi transceivers (OSFP-400G-SRBD or QDD-400G-SRBD) in a 4x100G breakout configuration, providing a migration path to 400 Gigabit Ethernet while maintaining compatibility with existing duplex multimode fiber infrastructure.

Q: What FEC is required for this transceiver?
A: The transceiver uses KP4 Forward Error Correction at 100Gbps data rate. This FEC is supported across all Arista 100G QSFP ports and helps reduce transmission errors in demanding data center environments.

Q: Is this transceiver compatible with other vendors' BiDi optics?
A: Yes, as long as the third-party 100GBASE-SR1.2 or 100G BiDi transceivers meet IEEE 802.3 and MSA specifications, they should be optically interoperable with this Arista module. Both ends must use the same BiDi variant (SR1.2 or SRBD) for proper operation.

Q: Can this module be used in breakout mode to connect to 25G SFP28 ports?
A: No, 100GBASE-SR1.2 BiDi transceivers use two optical fibers with dual wavelengths and are designed for point-to-point 100G connections. For 4x25G breakout applications, use 100GBASE-SR4 modules with MPO connectors or appropriate breakout copper cables.