Arista 400G Transceivers and Cables: Q&A

The 400G cables are designed to carry 8x 50Gb/s PAM-4 electrical lanes, while the 200G cables are designed to carry 8x 25Gb/s NRZ electrical lanes (see a later section of this document for a detailed explanation of PAM-4 and NRZ signaling). The high-speed 50G PAM-4 signals place more stringent .

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