As the two male DMX inputs of the D-Split are linked (designed for one DMX input at a time), as an installer, you can create non-standard, female-to-female DMX cabling to create a DMX chain of up to 32 D-Splits. Simply daisy chain each male XLR together from a single DMX source.
This is a way to ensure your DMX source can travel between the input side of your D-Splits (even if they aren’t powered on!)