Arista SFP-10G-ERBD-D-Arista | 10G SFP+ BiDi Transceiver, Tx1330nm/Rx1270nm, 40km

Q: What is the difference between the SFP-10G-ERBD-D and SFP-10G-ERBD-U?
A: The SFP-10G-ERBD-D is the downlink module transmitting at 1330nm and receiving at 1270nm. The SFP-10G-ERBD-U is the uplink module with the opposite wavelength pair (Tx 1270nm / Rx 1330nm). Both modules must be deployed as a matched pair for correct bidirectional operation over a single fiber strand.

Q: Why does this BiDi transceiver only use one fiber strand?
A: The SFP-10G-ERBD-D uses Wavelength Division Multiplexing (WDM) technology to carry transmit and receive signals on different wavelengths over the same single fiber strand. This reduces fiber plant requirements by 50%, which is especially valuable in conduit-constrained or high-cost fiber environments.

Q: Is optical attenuation required when deploying this transceiver?
A: Yes. On shorter links where the received optical power may exceed the receiver's maximum input level, in-line optical attenuators must be used to avoid receiver damage and ensure a stable, error-free link. Proper optical attenuation is required for shorter links to protect the receiver from permanent damage.

Q: Which Arista platforms are compatible with the SFP-10G-ERBD-D?
A: The SFP-10G-ERBD-D requires Arista EOS version 4.21.3 or later. For a full list of supported Arista switches and line cards, refer to the Arista Transceiver and Cable Compatibility Guide available on the Arista website.

Q: What type of fiber cable is required for this transceiver?
A: This transceiver requires OS2 single-mode fiber (SMF) terminated with a simplex LC connector. Unlike standard duplex transceivers that use two fiber strands, the BiDi design uses only one strand per link, so a single LC simplex patch lead is required.