Analog connection with DVI-I cable
A DVI-DL cable contains two data connections:


  The DVI-D and DVI-I connector includes provision for a second data link, but few devices implement this. In those that do, the connector is sometimes referred to as DVI-DL (dual link).
  -- Wikipedia


This is so that two devices (or one extra-high bandwidth device) can be connected to one DL capable port.

A cable with Dual Link wiring can use either DVI-D or DVI-I but not DVI-A as its connector.

It is unlikely that anyone under normal circumstances would want to use Dual Link with analog, since the whole point of the Dual Link is to give two digital connections.

For this reason it is common for Dual Link cables to not bother with the analog signals for both cost and cable bulk reasons.

So why does it have a DVI-I plug and not a DVI-D plug?  Because the video cards tend to have DVI-I or DVI-A sockets.  The flat pin in the center is larger on DVI-I and DVI-A than it is on DVI-D.