The S-type power supply is the small one (TDA0108).
Currently you have cell station interface cards, but no cell stations. You can do one of a couple of things:
Add another digital station card (maybe an 8 port - TDA0171). You really need to do this anyway, because you have 14 digital phones, 1 digital console, and a voicemail system, with a 2 port expansion card. That adds up to 17 digital ports. If you eliminate the CSIF cards, and add digital cell stations (kxt0151), you'll be all right. OR
You could add the tda0170 digital hybrid card, which gives 8 analog and 8 digital ports. Eliminate the CSIF cards, the cell stations and connect a plain old analog cordless phone.
