... competitive system would require many components such as CPU, mapper, STS-1 line, STS optical, and STS shelf modules, the Soneplex AM System requires only a controller unit, anoptical interface module and ... interface modules and productdescriptions, XX must be replaced with ST, SC, or FC to desig-nate the type of fiber optic connector required.User Interface Modules 4 DS1 Mapper DSX module 7 DS1 ... interface module. The reduced module set provideshigher reliability and lower cost than existing multiplexers. The reliability of theSoneplex AM System is the fault tolerant backplane, module...