Cable Matters DisplayPort to VGA Adapter

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  I was puzzled ...  

  Cable Matters DisplayPort to VGA Adapter (Personal Computers)

  How a passive adapter can convert a digital signal (DisplayPort) to analog (VGA)? Normally it would only be possible thanks to an active powered CONVERTER. According to the spec of the site Cable matters there would be a DAC inside the connector, act
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  No mini Display Port  

  Cable Matters DisplayPort to VGA Adapter (Personal Computers)

  I'm not made me realize that there DisplayPort and Mini display port - as it is not specified in the user guide of my laptop I just ordered this cable and it is not ... Not the Amazon nor fault of the supplier, but it profits me nothing.
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