Basic Q: Mouse and KB in same port?

Discussion in 'General Mac Discussion' started by crdean1, Mar 28, 2005.

  1. crdean1 macrumors 6502a

    crdean1

    Joined:
    Feb 14, 2005
    Location:
    Texas
    #1
    I recently bought a powerbook and am running a single 7 port usb 2.0 hub. I have a card reader and mouse plugged nto it so far. When I went to plug my new apple keyboard into it, it said that the keyboard uses to much power and it won't work.

    When I plugged the keyboard into the other usb port, it worked.

    Can you notrun the mouse and keyboard in the same port?
    Just curious.

    Thanks.
     
  2. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #2
    There's a limit to how much power can be drawn from a single port, (500 mA at 5 V ) it looks like three devices (4 if you include the hub itself) exceeded that for you. I always use powered hubs (with their own AC adaptor) to avoid this problem.

    The mouse can plug into the keyboard's USB-out port, obviously, so a mouse and keyboard are OK on a single port. It must be the card reader put it over the top, unless you have a non-standard keyboard or mouse.

    USB Hubs
    http://docs.info.apple.com/article.html?artnum=50468

    USB FAQs (Series of 4)
    http://docs.info.apple.com/article.html?artnum=30650
     
  3. crdean1 thread starter macrumors 6502a

    crdean1

    Joined:
    Feb 14, 2005
    Location:
    Texas
    #3
    The problem is...that I already have a powered hub. I tried unplugging everything else but the keyboard, and it is still doing the same thing....after some research, it looks as if I may have found the problem.

    What do you think about this: Could it be that...since the (apple) standard keyboard has two usb ports on it, that the hub doesn't supply enough power to run those two ports. If so, then my error message would make since ("There is not enough power to run this device"). My keyboard works when I plug it into the pb itself, which leads me to another question.

    Is there more power coming out of the usb port on my pb than the port on my hub, even though it has a seperate power adapter?

    Anyway, thanks for your help, and more advice would be appreciated as I am just learning about this stuff. I think I will just sell the keyboard and get a bluetooth keyboard to avoid any further issues.
     
  4. bostonwhaler1 macrumors member

    Joined:
    Aug 4, 2004
    Location:
    Toronto, Canada
    #4
    If your hub is powered, this shouldn't be a problem. Does your hub have a switch anywhere on it? Most do, and the positions would be labelled "Self" and "Bus". The switch should be in the "Self" position to draw power from AC instead of the PB's USB port.

    Just thought I'd throw that out there.
     
  5. crdean1 thread starter macrumors 6502a

    crdean1

    Joined:
    Feb 14, 2005
    Location:
    Texas
    #5
    Thanks boston, someone told me to look at this earlier. That may be the problem. I haven't checked on this yet. I'll post again after checking.
     
  6. bostonwhaler1 macrumors member

    Joined:
    Aug 4, 2004
    Location:
    Toronto, Canada
  7. crdean1 thread starter macrumors 6502a

    crdean1

    Joined:
    Feb 14, 2005
    Location:
    Texas
    #7
    I came home to check it out, and there is no switch. Pretty weird. Anyway, I think I will just get a wireless keyboard, at least I can then use it on the bed or move it around easier on the desk. Plus, my wife will like it better. I hope there is nothing wrong with my hub. Even though it is seperately powered, it may not provide as much power as the single powerbook port to run those keyboard ports. Is that possible? Because I may run into this same problem when I plug in a printer, etc.
     

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