Optical access for carriers has usually meant large, expensive add-drop multiplexers (ADMs) strategically placed throughout their network. Since most customers can't use large optical fiber feeds, the majority of lines fed to customers are broken out from an OC-3, the lowest nomemclature in optical fiber. That breakout usually happens at the ADM site where an OC-3 is broken down to DS3s and perhaps broken again to DS1s, and to DS0s.
ADTRAN has engineered a unique network component that can replace costly ADMs while delivering three DS3 lines from a single OC-3.
