Groups > sci.electronics.design > #446651

Re: USB cabling constraints

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From	amdx <nojunk@knology.net>
Newsgroups	sci.electronics.design
Subject	Re: USB cabling constraints
Date	Tue, 7 Feb 2017 10:28:46 -0600
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On 2/7/2017 9:43 AM, Don Y wrote:
> Are there any rules/guidelines for manufacturing/designing USB2
> cable assemblies?
>
> Compared to the constraints on network cables and SCSI cables,
> are they somewhere in-between?  Microphone cables?
>
> Or, more like ZIP cord for speakers?  :>

  I don't know*, but I just bought a cheap usb to apple iPod connector 
cable. I hadn't charged the iPod for years, (it was one of my kids).
  I plugged it in and the battery charged, before I got to down load
and data I dropped it and the plastic shell came off of the connector.
  I notice the white wire had been heated to the point the wire melted 
out of the insulation, of the four strands! one was broken. OK it wasn't 
touching anything so, whatever. But then I noticed two of the wires were 
shorted together at the pins. Looked up the connector and the Data+ and 
Data- were solder together. So, I cleaned it all up and put it back 
together. Now it doesn't even recognize the usb has been plugged into 
the computer.

* Well I have some clue to your question, this cheap cable has no 
shield, the wire is smaller that a #40 and there are 4 strands.
I was not able to see any twist.
   Tested with ohmmeter and it all checks correct. But no long will 
charge the battery.

   A google search show, quality cables have a shield, the data pair are 
and power pair are twisted.

> https://www.google.com/search?q=usb+cable+diagrams&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjEpN2Usv7RAhXJeSYKHakKDgsQ_AUICCgB&biw=1440&bih=687#imgrc=_

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Thread

USB cabling constraints Don Y <blockedofcourse@foo.invalid> - 2017-02-07 08:43 -0700
  Re: USB cabling constraints amdx <nojunk@knology.net> - 2017-02-07 10:28 -0600
    Re: USB cabling constraints jrwalliker@gmail.com - 2017-02-07 08:54 -0800
    Re: USB cabling constraints rickman <gnuarm@gmail.com> - 2017-02-07 20:37 -0500
    Re: USB cabling constraints Don Y <blockedofcourse@foo.invalid> - 2017-02-07 20:23 -0700
    Re: USB cabling constraints Robert Baer <robertbaer@localnet.com> - 2017-02-08 21:29 -0800
      Re: USB cabling constraints Kamen Lilov <kamenl@gmail.com> - 2017-02-09 14:01 -0800
  Re: USB cabling constraints Jeff Liebermann <jeffl@cruzio.com> - 2017-02-07 10:39 -0800
  Re: USB cabling constraints "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-07 19:06 -0600
    Re: USB cabling constraints Don Y <blockedofcourse@foo.invalid> - 2017-02-07 20:35 -0700
      Re: USB cabling constraints "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-08 17:49 -0600
        Re: USB cabling constraints Don Y <blockedofcourse@foo.invalid> - 2017-02-08 20:33 -0700
          Re: USB cabling constraints "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-02-09 16:43 -0600
            Re: USB cabling constraints Don Y <blockedofcourse@foo.invalid> - 2017-02-09 16:18 -0700

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