Although the Polaris cable should work with any RIB box, here's a word of warning about their cables.
The Polaris units are for *programming* only! I acquired one from another party for the Waris handhelds, and it works great for programming - but the cable doesn't have the Boot Control line in it, so you can't use it for flashing purposes!
Their response? Something along the lines of "Flashing isn't programming, is it?"
In response to the original poster, are you attempting to use the cable for a "regular" analog Saber on an ASTRO Saber? There are subtle differences between the Saber cable and the ASTRO Saber cable.