The 1RU TW-60 interface provides support for "Radio Interoperability" and includes a physical interface point to connect up to 4 Land Mobile Radios. The interface connects to earphone, microphone and push-to-talk radio controls. An audio output delay, to allow key-up time of a radio system on the outbound side of each connection, is also included with delay between 0 and 5000ms. Three separate controls for each radio are provided, Receive level, Transmit level and Delay time.