deskpro ens

Discussion in 'Compaq' started by racer, Sep 6, 2007.

  1. racer

    racer Guest

    hi

    the usb suplies power when the main power is off

    what current (ma) does it supply?
    racer, Sep 6, 2007
    #1
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  2. racer

    HH Guest

    It certainly should NOT be supplying power with the system shut down.
    Something is very wrong there. Dunno about milliamperes but it is 5V, IIRC.

    HH


    "racer" <> wrote in message
    news:...
    > hi
    >
    > the usb suplies power when the main power is off
    >
    > what current (ma) does it supply?
    >
    HH, Sep 7, 2007
    #2
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  3. HI!

    > It certainly should NOT be supplying power with the system shut
    > down.


    Whoa there...some desktop systems *do* in fact keep their USB ports powered
    when the power is "off". This is probably perfectly normal and nothing to be
    worried about.

    > Something is very wrong there. Dunno about milliamperes but it is 5V,
    > IIRC.


    The official spec for USB is 500mA at 5 volts DC. Most ports will stand
    more. If your computer keeps the ports energized when turned "off", you may
    not want to put a heavy load on them, as they may be getting power from the
    +5 volt standby supply.

    William
    William R. Walsh, Sep 26, 2007
    #3
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