The Riedel C31 is a Digital Intercom Splitter Box, not a digital intercom. It is designed for Riedel's Performer digital partyline intercom systems to expand and manage a wired intercom network. The device splits one incoming 3-pin XLR partyline signal into three separate 3-pin XLR outputs, enabling the distribution of intercom signals and power to multiple devices. It can be powered by the partyline itself or by an optional external power supply to extend cable distances significantly.