The Power of DSP helps make the DCS Compact the fastest, most flexible, most reliable phone system for the money. Samsung4s Super I interface switching technology is the component in our DCS Compact system that operates with ISDN-like speed and flexibility. With it, you have the flexibility to easily grow your system4s capabilities. It enables you to add single line devices such as a fax, modem or cordless phones, as well as digital devises like desktop phones to a single extension or port.