Hi, I'm Sadiq. I'm doing bachelor of science in telecommunication engineering. I was given the above mentioned question which was part of an academic research project, but unfortunately I was not able to get an answer for it, so I forwarded it.
In telecommunication it won't be as critical as in a hospital, for instance, but I have worked in the University Hospital of the University of Antwerp, Belgium, and it may be interesting to know what they have:
For a telecommunication application this is obviously overkill, but you'll have to decide whether you need the no-break circuit. And how much power do you need? Is this for a 10 kW transmitter? If you can live with a a short time of power-down you may not need the batteries to power the equipment, and then the generators will do. You'll need batteries to start the generators, and to keep your system controller powered though. The controller will have to switch the contactors once the generators run at the right frequency, so that they can power the equipment from that moment.