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4. Speaker and Microphone Volume
A speaker volume potentiometer (POT) is provided to increase or decrease the speaker volume—
please refer to the illustration below to determine how to adjust the speaker volume.
NOTE:
Microphone sensitivity is microprocessor controlled and allows the microphone gain to be
automatically increased in a quiet environment—allowing the answering point (receiving end) to
clearly hear even soft or distant sounds.
The microprocessor will automatically reduce the microphone sensitivity when the local environment
becomes noisy. This Automatic Noise Canceling (ANC) feature allows for intelligible two-way hands-
free communication even in environments with the presence of diesel engine or vehicular traffic noise.
DIP Switches 1 and 2 are provided to configure a few audio detection modes as outlined below.
DIP Switch 1
Position
ON
OFF
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DIP Switch 2
Function Description
Position
Normal audio detection mode
ON
[Default]
Increases sensitivity for audio detection on low level lines. For
OFF
situations where voice or busy signals have trouble breaking over
the speaker.
ETP-120 Series Phone
Installation & Operation Manual
Rev. 7/2/2021
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