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Re: USB Host-Host cables

From <tomas@tuxteam.de>
Newsgroups linux.debian.user
Subject Re: USB Host-Host cables
Date 2018-06-19 16:50 +0200
Message-ID <w2q7f-3Dv-13@gated-at.bofh.it> (permalink)
References <w0ci5-4S8-5@gated-at.bofh.it> <w2nj4-20B-5@gated-at.bofh.it> <w2nCq-2m7-5@gated-at.bofh.it> <w2oI9-2WU-3@gated-at.bofh.it>
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On Tue, Jun 19, 2018 at 09:11:43AM -0400, rhkramer@gmail.com wrote:
> On Tuesday, June 19, 2018 08:02:11 AM Richard Hector wrote:
> > On 19/06/18 23:47, rhkramer@gmail.com wrote:
> > > On Monday, June 18, 2018 11:27:55 PM Stefan Monnier wrote:
> > >> So I think your cable is much less "Serial" than you think.
> > > 
> > > Just because I'm tired of seeing this thread (even though I make an often
> > > feeble attempt to ignore it), I will mention that Ethernet is serial ;-)
> > > (full duplex in many cases)
> > 
> > Ah, but is it still?
> > 
> > Gigabit (1000base-T) uses all 4 pairs simultaneously, and also encodes
> > multiple bits per symbol, which I think makes it effectively parallel.
> 
> Well, I'm not familiar with gigabit Ethernet.  But even using all 4 pairs 
> simultaneously means that it might be some combination of serial and parallel 
> (I mean, 4 pairs isn't sufficient to carry 8 bits in parallel).

Parallel doesn't necessarily mean 8 bit. And 100BaseT sends three voltage
levels over the differential pair, so it's a tad more than 1.5 bits per
"wire". But then, it's 4B5B (because it has to weave in the clock) so
it's a tad less. 1 gigabit uses more pairs, but I guess each one is used
serially (because of clock skew), so it's more like "a bundle of serial",
and uses a more complex modulation (PAM), so it's more bits/baud even.

I think the "classical" distinction serial/parallel breaks down a bit
here...

Cheers
- -- t
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USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-13 13:40 +0200
  Re: USB Host-Host cables Dan Ritter <dsr@randomstring.org> - 2018-06-13 17:00 +0200
    Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-13 22:00 +0200
      Re: USB Host-Host cables Ulf Volmer <u.volmer@u-v.de> - 2018-06-13 23:10 +0200
      Re: USB Host-Host cables Dan Ritter <dsr@randomstring.org> - 2018-06-14 16:00 +0200
        Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-15 12:40 +0200
          Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-15 14:20 +0200
            Re: USB Host-Host cables Dan Ritter <dsr@randomstring.org> - 2018-06-15 21:10 +0200
          Re: USB Host-Host cables Gene Heskett <gheskett@shentel.net> - 2018-06-15 16:10 +0200
            Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-16 13:40 +0200
              Re: USB Host-Host cables Michael Stone <mstone@debian.org> - 2018-06-17 20:20 +0200
                Re: USB Host-Host cables Stefan Monnier <monnier@iro.umontreal.ca> - 2018-06-18 00:10 +0200
                Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-18 03:30 +0200
                Re: USB Host-Host cables David Wright <deblis@lionunicorn.co.uk> - 2018-06-19 02:40 +0200
                Re: USB Host-Host cables Stefan Monnier <monnier@iro.umontreal.ca> - 2018-06-19 05:30 +0200
                Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-19 13:50 +0200
                Re: USB Host-Host cables rhkramer@gmail.com - 2018-06-19 13:50 +0200
                Re: USB Host-Host cables Richard Hector <richard@walnut.gen.nz> - 2018-06-19 14:10 +0200
                Re: USB Host-Host cables rhkramer@gmail.com - 2018-06-19 15:20 +0200
                Re: USB Host-Host cables <tomas@tuxteam.de> - 2018-06-19 16:50 +0200
                Re: USB Host-Host cables rhkramer@gmail.com - 2018-06-20 03:50 +0200
                Re: USB Host-Host cables Curt <curty@free.fr> - 2018-06-19 14:50 +0200
                Re: USB Host-Host cables rhkramer@gmail.com - 2018-06-19 15:20 +0200
                Re: USB Host-Host cables David Wright <deblis@lionunicorn.co.uk> - 2018-06-21 04:00 +0200
                Re: USB Host-Host cables Michael Stone <mstone@debian.org> - 2018-06-21 05:20 +0200
                Re: USB Host-Host cables Gene Heskett <gheskett@shentel.net> - 2018-06-21 10:40 +0200
                Re: USB Host-Host cables Gene Heskett <gheskett@shentel.net> - 2018-06-21 17:50 +0200
                Re: USB Host-Host cables Charlie Gibbs <cgibbs@surfnaked.ca> - 2018-06-21 17:50 +0200
                Re: USB Host-Host cables Ben Caradoc-Davies <ben@transient.nz> - 2018-06-21 23:40 +0200
                Re: USB Host-Host cables Richard Owlett <rowlett@cloud85.net> - 2018-06-21 07:30 +0200
                Re: USB Host-Host cables Michael Stone <mstone@debian.org> - 2018-06-18 14:50 +0200
  A Bibliography [Re: USB Host-Host cables] Richard Owlett <rowlett@cloud85.net> - 2018-06-17 13:50 +0200

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