The Tesira EX-IN is a half-rack expander box for use with Tesira SERVER and SERVER-IO devices. The EX-IN is a 4-channel mic/line input expander. The expander communicates with the Tesira AVB network for audio networking, configuration and control and is powered by PoE+. The expander shall deliver line level analog output on plug-in barrier strip connection. Analog-to-Digital and Digital-to-Analog conversion shall be 24-bit with a sampling rate of 48kHz.