The VIAVI fX3 multi‑speed Ethernet modules combine advanced Layer 2–3 traffic generation and analysis with network emulation and application‑layer protocols to simulate diverse devices, users, and services. Designed for cost efficiency, they offer strong performance per dollar with reduced power consumption and quint‑speed flexibility, lowering both CapEx and OpEx. Ideal for functional and performance testing in data center and service provider networks where extreme protocol scaling is not required, the modules feature four QSFP28 ports using four 25G electrical lanes each to support modern transceivers and high‑speed interconnects.

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