USB-C Can Hit 120Gbps With Newly Published USB4 Version 2.0 Spec

An anonymous reader quotes a report from ArsTechnica: We've said it before, and we'll say it again: USB-C is confusing. A USB-C port or cable can support a range of speeds, power capabilities, and other features, depending on the specification used. Today, USB-C can support various data transfer rates, from 0.48Gbps (USB 2.0) all the way to 40Gbps (USB4, Thunderbolt 3, and Thunderbolt 4). Things are only about to intensify, as today the USB Implementers Forum (USB-IF) published the USB4 Version 2.0 spec. It adds optional support for 80Gbps bidirectional bandwidth as well as the optional ability to send or receive data at up to 120Gbps. The USB-IF first gave us word of USB4 Version 2.0 in September, saying it would support a data transfer rate of up to 80Gbps in either direction (40Gbps per lane, four lanes total), thanks to a new physical layer architecture (PHY) based on PAM-3 signal encoding. For what it's worth, Intel also demoed Thunderbolt at 80Gbps but hasn't released an official spec yet. USB4 Version 2.0 offers a nice potential bump over the original USB4 spec, which introduced optional support for 40Gbps operation. You just have to be sure to check the spec sheets to know what sort of performance you're getting. Once USB4 Version 2.0 products come out, you'll be able to hit 80Gbps with USB-C passive cables that currently operate at 40Gbps, but you'll have to buy a new cable if you want a longer, active 80Gbps. In a statement to CNET, USB-IF said they don't expect to see supporting products for the new spec for "at least 12 to 18 months." The USB Implementers Forum also updated the USB Type-C Cable and Connector and USB Power Delivery specifications today to accommodate USB4 Version 2.0.

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