I haven't been able to get a good answer yet, but I did notice that, if you click the first "Tell Me More" button, within the Advanced tab of the Edgeport Configuration Utility, it has a short paragraph about this feature.
Where it says "Ti" based products, that refers to the chipset of the Edgeport. Current Edgeports (being manufactured and sold today) are all Ti-based, and older Edgeports are what are called 930-based.
It would probably make sense to see if your Edgeport/4 is Ti (compatible with this feature) or 930 (where this feature would not be relevant). What's the 50xxxxxx part number and revision (usually a single letter that follows) of your unit?