Grandstream Networks GSC3510 Series User Manual page 58

Figure 54: Device Detection – Audio Loop Test
Built-in Speaker Test
Built-in Speaker Test is used to test the GSC3510/GSC3505 by playing a piece of music in order to verify the sound quality.
Figure 55: Device Detection – Built-in Speaker Test
LED Test
Led Test is used to test the availability of the four colored LEDs and their intensity. The colors of LEDs available on the GSC3510/GSC3505 are: Green, Red,
Blue and White.