There isn't too much to it. How many units do you have? What type of connectivity do each require? bris, pri, ? The most important thing is that your carrier supports 64K data. Who is your provider for your local and LD PRI's? Another cheap but robust alternative depending on you answers to the about is an Adtran 550 or 800 DACS. You can have 1 or more PRI's from the PBX or LEC to the adtran, then come out of the adtran via PRI or BRI's to the various video units. We currently use 2 PRI's from the PBX to an Adtran, then 4 PRI's and 9 BRI's out to 7 video units. Since each unit typically only uses 6 channels at a time, we could get away with just 1 PRI but we had the extra equipment so we added the extra capacity just in case.
-CL