Grace Digital GDI-USBM10 Business Audio System User Manual
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5
SET UP & OPERATION
o SET UP CONNECTION to a PBX or KEY PHONE SYSTEM
BACK PANEL VIEW:
STEP 1 Plug Power Adapter into a wall power outlet 
STEP 2 Plug the Power Adapter into the jack marked “DC 5V” 
STEP 3 Plug the Connector Cable to the “AUDIO OUT“ Jack 
NOTE: Most phone systems have an RCA connection on the PBX or Key System unit.
Some systems may have a 3.5mm mini connection. 
RCA-to-RCA & RCA-to-3.5mm mini connector cables are included. 
STEP 4 Plug the other end of the cable into the Phone System’s On-Hold Input Jack.
NOTE: IF the jack cannot be located for the system, contact the vendor for the phone
system to assist to identify the location on the phone system you are using.
o OPERATION
FRONT PANEL VIEW:
STEP 1 Insert the USB Flash Drive into the USB connection slot on the front of the unit 
STEP 2 Press the Power Button on the front of the unit to power on the device 
STEP 3 Turn the Volume Control Knob on the front of the unit to set the outgoing 
volume level to be heard by the caller on hold
NOTES:
Volume Knob controls the built-in Speaker and controls the volume level to 
the PBX system / KEY phone system 
Continuous playback will begin automatically
Press the Speaker Button to turn the monitor Speaker ON and monitor the 
audio output to your system, or turn the monitor Speaker OFF and not 
monitor the audio 
