So you want to test the DX without connecting it to your E1. This would be a hard thing to do as there is no place to send the call when it comes in from IP. I suppose you could use a T1/E1 crossover cable to connect the 2 E1 ports together (back-to-back), and have a call come from IP to the DX, go out E1 port 1, then back in E1 port 2 and back to IP. That would test the unit, but probably not your application.
Also, please be aware that the DX does not support BNC connector. It must be RJ45.
I will send you a message to your email as well.