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Pulse-amplitude modulation
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===USB=== [[USB4]] Version 2.0 uses PAM-3 signaling for USB4 80 Gbps (USB4 Gen 4Γ2) and USB4 120 Gbps (USB4 Gen 4 Asymmetric) transmitting 3 bits per 2 clock cycles.<ref>{{Cite web |last=GraniteRiverLabs |first=Team |date=2023-01-17 |title=Welcome to the 80Gpbs Ultra-High Speed Era of USB4 {{!}} GraniteRiverLabs Taiwan |url=https://www.graniteriverlabs.com/en-us/technical-blog/usb4-80-cio80 |url-status=live |archive-url=https://web.archive.org/web/20230221162539/https://www.graniteriverlabs.com/en-us/technical-blog/usb4-80-cio80 |archive-date=2023-02-21 |access-date=2023-02-21 |website=www.graniteriverlabs.com |language=en-us}}</ref> [[Thunderbolt 5]] uses the same PHY.<ref>{{cite web |author1=Ian Cutress |date=2021-08-01 |title=Intel Executive Posts Thunderbolt 5 Photo then Deletes It: 80 Gbps and PAM-3 |url=https://www.anandtech.com/show/16858/intel-executive-posts-thunderbolt-5-photo-80-gbps-and-pam3-then-deletes-it |website=AnandTech |language=en}}</ref>
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