Re:Why aren't motherboards mostly USB-C by now? (2021)
by serf on Sunday November 19, 2023 @02:40AM
(#38330162)
>That's likely to be the exact reason why the reliability specs don't line up with reality: your test jigs are almost certainly going to be inserting the plugs directly with exact precision, whereas in practice people are going to just "jam it in" and apply significant side-loads as well as misalignment and levering forces.
as someone who was involved with endurance/reliability testing of other physical products, I think you'd be surprised.
Randomized jitter and movement patterns are often replicated and considered.
Re:Why aren't motherboards mostly USB-C by now? (2021)
by hulitu on Sunday November 19, 2023 @06:15AM
(#38331563)
I agree with the parent's comment. I also worked with automated test setups and did human tests. Nothing compares to a human tester. We tested small remote controlls and it was amazing to see that a human hand can inflict more damage to the product that an automated test setup. (the remote was given to different persons just to push the buttons until we reached the desired number of button presses).
Re:Why aren't motherboards mostly USB-C by now? (2021)
by roywashere on Sunday November 19, 2023 @02:47AM
(#38330201)
I guess most damage actually does not happen during insertion itself but when someone trips over the cable while the plug is in the socket. Simply because of its bigger size that force is then applied to a bigger grip surface and thus lower per square millimeters on USB-A while the forces will be much bigger with C
Re:Why aren't motherboards mostly USB-C by now? (2021)
by matsemann on Sunday November 19, 2023 @03:20AM
(#38330414)
> your test jigs are almost certainly
Why assume that? Why not be humble and just ask the person with first hand knowledge instead of basically attacking their setup based on guessing?
Re:Why aren't motherboards mostly USB-C by now? (2021)
by userbinator on Sunday November 19, 2023 @03:56AM
(#38330639)
Because you can search for what connector testing machines look like, and they all look like they'll just destroy the connector if it isn't aligned correctly.
Re:Why aren't motherboards mostly USB-C by now? (2021)
by hulitu on Sunday November 19, 2023 @06:18AM
(#38331579)
This is true. A test system will only apply force from one or more predefined directions. A user, on the other side will not take care that he inserts the connector at 45 degrees +/- 3 degrees.
Re:Why aren't motherboards mostly USB-C by now? (2021)
by jiggawatts on Sunday November 19, 2023 @03:31AM
(#38330488)
This is like Samsung testing their foldable phone... in a clean room.
That's likely to be the exact reason why the reliability specs don't line up with reality: your test jigs are almost certainly going to be inserting the plugs directly with exact precision, whereas in practice people are going to just "jam it in" and apply significant side-loads as well as misalignment and levering forces.
It's not hard to design a connector that'll last 25k precisely aligned insertions by a test jig but will consistently fail after a few cycles of being mated by typical "hamfisted" users.