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USB connections, lead length?

Discussion in 'Electronic Design' started by Jem Berkes, Aug 1, 2003.

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  1. Jem Berkes

    Jem Berkes Guest

    I'm in the process of building some custom hardware (personal, nothing
    industrial) and need to locate some USB ports in various spots. Does anyone
    know who short I should keep the data- and data+ leads for each port? I
    recall that even the PC parallel port did at least 60 feet, so the serial
    bus can probably handle longer?
     
  2. Ian Stirling

    Ian Stirling Guest

    Nope.
    5m or so is around the longest that is specified.
    A little longer will probably work, but for significantly longer
    you need an active cable.
     
  3. The official maximum length for USB is 5 metres (16.5 ft). This can
    be extended somewhat by placing a hub every 5 metres. (I don't know
    the maximum number of segments.)
     
  4. Rob Judd

    Rob Judd Guest

    If you want those sorts of lengths, use RS-485.

    Rob
     
  5. Chris Hodges

    Chris Hodges Guest

    6 segments leading to 30m (5 hubs). This then gives a logical
    structure of 8 devices in the chain: Host controller-Root
    Hub-[Hub*5]-Device. 8 tends to suggest a hard limit to me.

    Chris
     
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