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MG-DS1 (DS1 Interface Media Module)
Issue 1 June 2005 1595
Echo Cancellation
The MM710 Media Module features an integrated echo canceller. Echo cancellation supports
channels carrying voice and is not intended for channels that support data. The MM710 has the
capability to detect modem tone and turn off echo cancellation accordingly for the duration of a
data call. Echo cancellation on the MM710 will be administrable per channel. The echo
cancellation circuitry on a given MM710 is driven by administrable parameters.
The MM710 Media Modules are intended for use with ATM, IP, wideband, or other complex
services which are likely to have problems with echo.
The echo cancellation circuitry on a given MM710 is a right-to-use feature activated on the
System-Parameters Customer-Options form. Also on this form is a field Maximum Number
of DS1 Boards with Echo Cancellation that indicates the number of DS1 boards on which
echo cancellation is activated for a specific customer.
The DS1 Media Module form for the MM710 Media Module has fields to support echo
cancellation: Echo Cancellation?, EC Direction, and EC Configuration. The Echo
Cancellation? field displays only if the Echo Cancellation feature has been activated on the
system-parameters customer-options form by entering a y in the DS1 Echo
Cancellation field. The EC Direction and EC Configuration fields do not display unless the
user has entered y in the DS1 Echo Cancellation field.
● EC Direction determines the direction from which echo will be eliminated, ether inward or
outward.
● EC Configuration is the set of parameters that will be used when cancelling echo. This
information is stored in firmware on the MM710 Media Module.
Echo cancellation is turned on or off on a trunk group basis using the change trunk-group
command. If the Trunk Group field, DS1 Echo Cancellation? is set to y, echo cancellation will
be applied to every MM710 trunk member in that trunk group. The echo cancellation
parameters used for a given trunk member are determined by the Echo Cancellation
Configuration Number administered on the DS1 Media Module form for that specific trunk’s
board.
Note:
Note: It is not necessary to busyout a port or trunk group to change the DS1 Echo
Cancellation field on the change trunk-group form. However, the modified
setting will not take effect until one of the following occurs:
● Port is busied-out/released
● Trunk group is busied-out/released
● Test trunk group is executed
● Periodic maintenance runs