Well I am not familiar with the Motorola DAC, but I would assume it's pretty simular to SA DNCS. We use NCUBE(C-COR NOW) they did the VOD server setups (turn key). 
Number of subs per transmitter needs to be looked at. In our case we almost went 1 transmitter for each node or did some narrowcasting. It really depends on your system design. I would start with these guys or consult your engineers.
http://www.c-cor.com/on_demand/
or
http://www.schange.com/Products/On_Demand/Main.asp
    
    Re: Whats needed to start offering On Demand
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