Arista QDD-400G-SRBD1 | 400G QSFP-DD BiDi Transceiver, MMF, 850nm/910nm, 100m

Q: What is the difference between SR4.2 and standard SR8 transceivers?
A: SR4.2 BiDi technology uses bidirectional wavelengths (850nm and 910nm) over four fiber pairs to achieve 400G, requiring only an MPO-12 connector. Standard SR8 uses eight parallel fibers with an MPO-16 connector. SR4.2 reduces fiber count and infrastructure costs while maintaining similar reach.

Q: Can this module be used for 100G breakout applications?
A: Yes, the QDD-400G-SRBD1 supports software-configurable breakout to four 100GBASE-BIDI or 100GBASE-SR1.2 connections, enabling flexible migration paths and cost-effective 100G deployments from a single 400G port.

Q: What fiber types are compatible with this transceiver?
A: This module requires OM3 or OM4 multimode fiber with MPO-12 UPC connectors. It achieves 70m transmission distance on OM3 and up to 100m on OM4. OM5 fiber can also be used with similar performance characteristics.

Q: Is this transceiver compatible with Cisco or other vendor equipment?
A: The QDD-400G-SRBD1 follows industry-standard QSFP-DD MSA and IEEE 802.3 specifications. While designed for Arista platforms, it may be compatible with other vendor equipment supporting 400GBASE-SR4.2 BiDi, though vendor-specific coding may apply.

Q: Does this module require special licensing or software?
A: No special licensing is required for the transceiver itself. However, ensure your Arista switch platform and software version support QSFP-DD modules and the specific 400G or 100G breakout configurations you intend to deploy.