Re: USB-C cabling

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There is a lot of spec weirdness on "usb3" cables.    You have to
carefully read the description on the cable, and sometimes the
reviews.

I have seen usb3 charging cables (data is usb2).

I have seen usb3 charging (3A or 5A) + 5G, and usb3 charging + 10G.

So usb-c to usb-c any length longer than a meter or 2 would need to be
an active USB3 cable, and there are different power (3A/5A), and then
usb2 speed, 5G or 10G.

And they all say usb-c since that connector is on both ends.

On Thu, Dec 7, 2023 at 11:57 PM <fedora@xxxxxxxxxxxxxx> wrote:
>
> A while back I acquired a NVMe caddy but did not get to use it. I now did as I got an NVMe disk.
>
> The caddy is
>         https://www.aliexpress.com/item/1005001346524009.html
>                 Color: 10Gbps M2PV C3
> The disk is
>         1TB WD Blue SN580 NVMe WDS100T3B0E (PCie v4)
>
> I expected to see 1GB/s speed.
>
> Read [X=Y] cable from USB-X to USB-Y. Caddy on left, machine on right.
>
> 1) Directly connecting the caddy to the machine (caddy-[C=C]-socket) I see 36MB/s. So USB-2? speed.
> 2) Using a caddy-[C=USB3M]-socket I get 442 MB/s. So USB-3.0 speed. This is expected.
> 3) The kicker: caddy-[C=USB3M] then [FUSB3=C]-socket (two cables) I get the expected 1000MB/s.
>
> I tried a few C=C , no change. Two different machines. same.
>
> What I want, of course, is good speed with a straight C=C cable.
>
> TIA
>
> --
> Eyal at Home (fedora@xxxxxxxxxxxxxx)
> --
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