The Extreme Extender ADAT In converts ADAT optical to HearBus signal, using CAT5E, extend connections to an additional 500ft. The Extreme Extender ADAT In has an ADAT optical input. Buffered ADAT thru acts as an optical splitter to give local ADAT connection to source. Extreme Extender ADAT In output is a RJ45 HearBus connection for CAT5E cable. Extreme Extender ADAT In uses 9Vdc supply to power system. When used with Hear Back system, power is supplied from HearBus hub connection.