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why isn't it ok? why???? (i.imgflip.com)

submitted 3 months ago by [email protected] to c/[email protected]

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cross-posted from: https://lemmy.cringecollective.io/post/75583

why isn't it ok? why????

Meme "the number of people who think this is an abomination" over a photo of a USB-A to USB-A cable, "but think this is perfectly acceptable" over a photo of a USB-C to USB-C cable, "makes me sick."

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[–] [email protected] 1 points 3 months ago (2 children)

C-C carries more power than A-C?

[–] [email protected] 4 points 3 months ago (1 children)

USB-PD is only specified for USB-C. I think they use an extra channel for this configuration, so it's not possible to use PD over A plugs.

There were competing standards like Qualcom quick charge. AFAIK they never went above 20-ish watts on USB-A, while PD is specced at up to 240W.

[–] [email protected] 1 points 3 months ago (1 children)

Interesting. I always figured the wires inside were all the same.

[–] [email protected] 3 points 3 months ago

Oh no the wires are a mess. Usb3 cables have extra wires and pins for super-speed. IIRC usb-c has said extra pins for usb configuration like pd or displayport alt mode. The wires can also be different. Some can carry more current, most cables are insufficient for really high data rates...

[–] [email protected] 2 points 3 months ago

Yes, USB-A is only spec’ed for 5v 2.4a, so it will end up throttling the USB-C end which has higher power delivery specs.