The VIAVI fX3 multi‑speed Ethernet test modules combine advanced Layer 2–3 traffic generation and analysis with network emulation and application‑layer protocols to simulate a wide range of devices, users, and services. Designed for strong performance per dollar, they reduce power consumption and support multiple speeds to lower both CapEx and OpEx. Ideal for functional and performance testing in data center and service provider networks that do not require extreme protocol scaling, the modules feature six QSFP28 ports using four 25G electrical lanes each to support modern transceivers and high‑speed interconnects.

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