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DisplayPort Alternate Mode for USB Type-C Announced - Video, Power, & Data All Over Type-C(4)
Nov 26, 2018

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For that reason the possibility is on the table of ditching the DisplayPort physical layer entirely and relying solely on Type-C. Now to be clear this is just an option the technology enables, but for a number of reasons it would be an attractive option for the VESA. As it stands the DisplayPort physical layer tops out at 8.1Gbps per lane for HBR3, meanwhile Superspeed+ over Type-C tops out at 10Gbps per lane with the design goal of further bandwidth increases. As the complexity and development costs of higher external buses goes up, one could very well see the day where DisplayPort was merely the protocol and signaling standard for monitors while Type-C was the physical layer, especially since DisplayPort and USB Superspeed are so very similar in the first place due to both using 4 lanes of differential signaling. But this is a more distant possibility; for now the DP Alt Mode ecosystem needs to take off for the kinds of mobile devices it’s designed for, and only then would anyone be thinking about replacing the DisplayPort physical layer entirely.

Wrapping things up, the VESA tells us that they are going to hit the ground running on DP Alt Mode and are seeing quite a bit of excitement from manufacturers. The VESA is expecting the first DP Alt Mode capable devices to appear in 2015, which is the same year Type-C ports begin appearing on devices as well. So if everything goes according to schedule, we should see the first DP Alt Mode devices in just over a year.

The all-in-one cable concept has been a long time coming, and after DockPort and Thunderbolt stumbling the market does look ripe for DP Alt Mode. So long as the execution is there, the manufacturers are willing to use it, and device compatibility lives up to the promises. Getting video over USB is the ultimate Trojan horse – unlike mDP, USB is already everywhere and will continue to be – so this may very well be the X factor needed to see widespread adoption where other standards have struggled.


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