This audio input / output board is dedicated to a function slot of the EST-CU-8LCD. It offers 4 line audio inputs through an RJ45 connector, as well as 8 symmetrical outputs through an RJ45 connector to drive audio signals to external devices or amplifiers in the EST ENT VES system. The board is also equipped with an RS485 interface with the help of which the EST ENT VES system can be controlled or integrated with devices offered by other producers.