well first of all 14 layers it's just an option . Catalyst work even with one layer only .
The best DMX interface to control catalyst ( IMO ) it's not the CIB , you can use ARTNET .
With ARTNET you can run zilions of DMX univers in the same cat5 cable .
If you want to run a 14 layers + accessories Catalyst I suggest to get a DMX to ARTNET box like this . http://www.artisticlicence.com/item37.htm
So you can use two different univers .
the cost of this boxes are a fraction of the CIB they work better and they are more handy .
But I repeat , you are not forced to run 14 layers , that's it's only an option .