Re: USB extension cables

From	Andy Burns <usenet@andyburns.uk>
Newsgroups	alt.comp.os.windows-10, alt.comp.os.windows-11, sci.electronics.repair
Subject	Re: USB extension cables
Date	2026-04-28 21:10 +0100
Message-ID	<n5ciguF78d2U1@mid.individual.net> (permalink)
References	<ptmvuk5f1ahmdklavmhkp158hhef3iujfb@4ax.com> <n5b57mFbrsU1@mid.individual.net> <69f0f75d$2$26$882e4bbb@reader.netnews.com>

Cross-posted to 3 groups.

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Sam E wrote:

> Andy Burns wrote:
> 
>> Higher spec cables often contain chips at each end, to tell what it's
>> connected to what speed/power it can handle, if you whack an extension
>> on the end, that information will be wrong and you risk sending over 100
>> watts of power down a cable not rated for it ...
> 
> If you know much about electricity, you know that watts/amps don't flow
> unless there's some kind of load.

Sure, current is pulled rather than pushed, but the comms between source 
and sink device can set the supply to 48V which most devices won't be 
ready for.

> Also, the damaged chip is likely to be
> non-functional, and the power is limited to 60W.

Latest USB PD3.1 spec caters for up to 240W

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USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-04-27 18:07 -0400
  Re: USB extension cables Hank Rogers <Hank@nospam.invalid> - 2026-04-27 17:30 -0500
  Re: USB extension cables Jeff Liebermann <jeffl@cruzio.com> - 2026-04-27 15:56 -0700
    Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-04-27 23:40 -0400
      Re: USB extension cables Frank Slootweg <this@ddress.is.invalid> - 2026-04-28 10:26 +0000
        Re: USB extension cables Andy Burns <usenet@andyburns.uk> - 2026-04-28 11:41 +0100
        Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-04-29 16:18 -0400
      Re: USB extension cables Paul <nospam@needed.invalid> - 2026-04-28 11:53 -0400
  Re: USB extension cables "Carlos E.R." <robin_listas@es.invalid> - 2026-04-28 03:08 +0200
  Re: USB extension cables Andy Burns <usenet@andyburns.uk> - 2026-04-28 08:17 +0100
    Re: USB extension cables Paul <nospam@needed.invalid> - 2026-04-28 12:41 -0400
    Re: USB extension cables Sam E <no.email@here.invalid> - 2026-04-28 18:07 +0000
      Re: USB extension cables Andy Burns <usenet@andyburns.uk> - 2026-04-28 21:10 +0100
        Re: USB extension cables Mark Lloyd <not.email@all.invalid> - 2026-04-29 17:34 +0000
      Re: USB extension cables Daniel70 <daniel47@nomail.afraid.org> - 2026-04-30 19:35 +1000
        Re: USB extension cables Mark Lloyd <not.email@all.invalid> - 2026-04-30 18:08 +0000
          Re: USB extension cables "Carlos E.R." <robin_listas@es.invalid> - 2026-05-01 13:41 +0200
            Re: USB extension cables Paul <nospam@needed.invalid> - 2026-05-01 12:38 -0400
              Re: USB extension cables Daniel70 <daniel47@nomail.afraid.org> - 2026-05-02 20:46 +1000
              Re: USB extension cables Mark Lloyd <not.email@all.invalid> - 2026-05-02 19:06 +0000
                Re: USB extension cables Paul <nospam@needed.invalid> - 2026-05-02 19:01 -0400
                Re: USB extension cables Nioclás Pól Caileán de Ghloucester <thanks-to@Taf.com> - 2026-05-07 19:39 +0000
              Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-05-10 02:08 -0400
                OT: electrical pioneers (was: Re: USB extension cables) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-10 11:39 +0100
                Re: OT: electrical pioneers (was: Re: USB extension cables) Jeroen Belleman <jeroen@nospam.please> - 2026-05-10 21:18 +0200
                Re: OT: electrical pioneers (was: Re: USB extension cables) micky <NONONOmisc07@fmguy.com> - 2026-05-10 15:41 -0400
                Re: OT: electrical pioneers "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-11 13:16 +0100
          Re: USB extension cables Daniel70 <daniel47@nomail.afraid.org> - 2026-05-02 20:41 +1000
            Re: USB extension cables Paul <nospam@needed.invalid> - 2026-05-02 10:39 -0400
    Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-04-29 16:24 -0400
      Re: USB extension cables "Kerr-Mudd, John" <admin@127.0.0.1> - 2026-04-30 09:09 +0100
        Re: USB extension cables Daniel70 <daniel47@nomail.afraid.org> - 2026-04-30 19:39 +1000
          Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-04-30 10:28 -0400
            Re: USB extension cables Paul <nospam@needed.invalid> - 2026-04-30 12:00 -0400
      Re: USB extension cables legg <legg@nospam.magma.ca> - 2026-05-03 08:06 -0400
        Re: USB extension cables The Horny Goat <lcraver@home.ca> - 2026-05-08 10:14 -0700
          Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-05-09 20:05 -0400
            Re: USB extension cables Jeff Liebermann <jeffl@cruzio.com> - 2026-05-09 18:35 -0700
              Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-05-10 02:02 -0400
                Re: USB extension cables Jeff Liebermann <jeffl@cruzio.com> - 2026-05-10 08:47 -0700
                Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-05-10 15:38 -0400
                Re: USB extension cables Daniel70 <daniel47@nomail.afraid.org> - 2026-05-11 20:33 +1000
                Just OT (was: Re: USB extension cables) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-11 13:10 +0100
      Re: USB extension cables Jeff Liebermann <jeffl@cruzio.com> - 2026-05-03 10:33 -0700
        Re: USB extension cables Mark Lloyd <not.email@all.invalid> - 2026-05-03 18:22 +0000
        Re: USB extension cables "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-03 19:47 +0100
        Re: USB extension cables micky <NONONOmisc07@fmguy.com> - 2026-05-09 20:07 -0400

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