AudioCodes Mediant 1000B User Manual page 975

User's Manual
Parameter
Echo Canceler
echo-canceller-enable
[EnableEchoCanceller]
Max Echo Canceller Length
max-echo-canceller-
length
[MaxEchoCancellerLength]
echo-canceller-hybrid-
loss
[ECHybridLoss]
echo-canceller-NLP-mode
[ECNLPMode]
echo-canceller-
aggressive-NLP
Version 7.0
Global parameter that enables echo cancellation (i.e., echo from
voice calls is removed). You can also configure this functionality
per specific calls, using IP Profiles
(IpProfile_EnableEchoCanceller) or Tel Profiles. For a detailed
description of the parameter and for configuring this functionality
in the IP Profile table, see 'Configuring IP Profiles' on page
Tel Profile table, see Configuring Tel Profiles on page 381.
Note: If this functionality is configured for a specific profile, the
settings of this global parameter is ignored for calls associated
with the profile.
Defines the maximum Echo Canceler Length (in msec), which is
the maximum echo path delay (tail length) for which the echo
canceller is designed to operate:

[0] Default = (Default) Based on various internal device
settings to attain maximum channel capacity

[11] 64 msec

[22] 128 msec
Notes:

For the parameter to take effect, a device reset is required.

Using 128 msec may reduce channel capacity. For example:
with DSP Template 0 and number of spans 4, the capacity is
reduced from 120 to 100. The reduction depends on the
combination of "DSP Template" and "Number of Spans". For
accurate figures, see SBC and DSP Channel Capacity on
page 1139.

When housed with an analog/BRI module, the device can use
a max. echo canceller length of 64 msec.

When housed with PRI TRUNKS module, the device can use
a max. echo canceller length of 128 msec.

When housed with an MPM (in Slot #6), no channel reduction
occurs.

It is unnecessary to configure the parameter
EchoCancellerLength, as it automatically acquires its value
from the parameter.
Defines the four-wire to two-wire worst-case Hybrid loss, the ratio
between the signal level sent to the hybrid and the echo level
returning from the hybrid.

[0] = (Default) 6 dB

[1] = N/A

[2] = 0 dB

[3] = 3 dB
Defines the echo cancellation Non-Linear Processing (NLP)
mode.

[0] = (Default) NLP adapts according to echo changes

[1] = Disables NLP

[2] = Silence output NLP
Note: The parameter can also be configured in a Tel Profile.
Enables the Aggressive NLP at the first 0.5 second of the call.

[0] = Disable
975
59. Configuration Parameters Reference
Description
Mediant 1000B Gateway and E- SBC
385 or