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From: Roger Hayter <roger@hayter.org>
Newsgroups: sci.electronics.repair
Subject: Re: USB functionality.
Date: 9 Mar 2024 22:09:55 GMT
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On 9 Mar 2024 at 21:54:51 GMT, "Andrew Smallshaw" <andrews@sdf.org> wrote:

> On 2024-03-09, peter@easthope.ca <peter@easthope.ca> wrote:
>> 
>> This photo,
>> https://commons.wikimedia.org/wiki/File:USB-OTG_Setup_IMG_2342.JPG
>> suggests, to me at least, that the phone can be charged while the
>> keyboard, mouse and flash store are used.  True?
> 
> There are altogether too many unknowns here.  Looking at the date
> of the photo - 2015 - some phones of that era could support USB
> OTG but were unable to supply power to connected peripherals,
> meaning you would need a Y cable to supply that separately.  Others
> could do the job inclusive of power delivery, others couldn't work
> in OTG mode at all.  Generally you couldn't use OTG and charge
> simultaneously, it's a role reversal that early USB wasn't designed
> for.
> 
> Things are different with USB-C but of course that is much later.

But can even USB-C accept a signal input (keyboard and mouse for instance) and
unrelated signal output (audio for instance) on the same physical socket? I
ask only out of curiosity.



-- 
Roger Hayter