The printer will act as if media of the chosen dimension (in the feed direction) is present in this input source. Note that this value will be used even if the input tray is empty. Feed dimension measurements are taken relative to the feed direction associated with that sub-unit and are in input sub-unit dimensional units (controlled by prtInputDimUnit, which uses PrtMediaUnitTC). If the printer supports the declared dimension,the granted dimension is the same as the declared dimension. If not, the granted dimension is set to the closest dimension that the printer supports when the declared dimension is set. The value (-1) means other and specifically indicates that this sub-unit places no restriction on this parameter. The value (-2)indicates unknown.