NEC Electra Elite IPK Installation And Maintenance Manual page 29

MEGACO Station
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Echo Suppressor Settings:
When a VoIP call is transferred to a 2-wire loop start circuit, it has a potential to generate
large side tone towards the VoIP path. Due to the nature of delays involved in a VoIP
communication network, the side tone can be heard as large echo at the distant end. The
IAD(8)-U( ) ETU has a built in echo canceller optimized for a standard loop start trunk.
However, as the loop start trunk characteristics vary depending on the distances from the
repeater/CO, further fine-tuning may be required for optimum echo performance.
This field can be used to fine-tune the echo performance for a given trunk. If additional
fine-tuning is required, access the "Advanced" mode. If the advanced mode is select,
Echo Buffer, Calibration TX, and Calibration RX are made available for configuring.
Volume Setting
These fields are used to provide the attenuation applied to obtain adequate voice levels
for the end users. Altering this value is not recommended unless solving issues related to
voice quality or echo.
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Hardware, Installation and Maintenance Manual
Echo Calibration (Default value: 0)
K
Echo Buffer: (Default value: 0)
K
Calibration TX: (Default value:0)
K
Calibration RX: (Default value:0)
K
As a general rule of thumb, if the trunk is "hot", use the negative numbers.

The hotter the trunk, the larger the negative number.
Transmit Gain: (Default Values: 0)
K
Receive Gain: (Default Value: 0)
K
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