usb downstream/upstream

Discussion in 'Mac Accessories' started by bcburrows, Sep 29, 2009.

  1. bcburrows macrumors 6502

    bcburrows

    Joined:
    Mar 25, 2009
    Location:
    Bristol
    #1
    Can someone explain to me what upstream and downstream usb ports are?
     
  2. Makosuke macrumors 603

    Joined:
    Aug 15, 2001
    Location:
    The Cool Part of CA, USA
    #2
    One is the square-ish D shaped connector found only on devices (ie your printer or an external hard drive. They are only on things that get plugged into something else--devices.

    The other are the flatter rectangular ports found on anything you plug things into (ie your computer or a router that can share a printer). They are only on things that things get plugged into--hosts.

    Some things--hubs, mostly--will have both, since they can connect to a host as well as other devices, which they pass through to that host.

    Since the only USB cables you'll ever find have one of each kind of connector on each end, it's pretty much impossible to hook anything up wrong.
     
  3. bcburrows thread starter macrumors 6502

    bcburrows

    Joined:
    Mar 25, 2009
    Location:
    Bristol

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