The ClearCom TW-12C Clear-Com/RTS System Intercom Interface is a transparent device that provides an electrically isolated interface between two intercom systems (ClearCom and RTS, for example). The TW-12C is designed to connect the two intercom systems in a completely transparent manner allowing either "side" of the interface to connect to a Clear-Com intercom system or to an RTS intercom system. This covers Clear-Com to Clear-Com, Clear-Com to RTS or RTS to RTS interfacing. The TW-12C provides a pair of 3-pin, XLR connectors (one male, one female) for each side of the interface.

The interface consists of two identical 2-wire-to-4-wire hybrid networks, with transformer isolation between them. This complete electrical isolation breaks ground loops that occur when two systems are run from separate power sources. The TW-12C hybrid provides a wide range of null adjustments, allowing it to adapt to many different line conditions. It can handle various line lengths and impedances.