Now that everything is connected, it’s time to check for signs of life!
First, power the unit up and watch it complete its self-test. If the phone line is connected properly, a “dot” should be present on the display. If a minus “-” is displayed, the Hx does not detect the line voltage on the idle POTS line. Check your wiring!
If your Hx is directly connected to a phone line, press the [ON] key and dial tone should be present on the Hx’s output and RCV bar graph.
Next, verify correct mix-minus operation by noting that the RCV bar graph shows the dial tone at a nominal level and that the SND bar graph shows only the microphone or audio present on the device feeding the Hx SEND IN. Remember, the goal of a proper mix-minus is to prevent the hybrid from "hearing itself."