Avaya 03-300430 Home Security System User Manual


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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 June 2005 2383
The DS1 Circuit Pack screen for the TN464GP/TN2464BP circuit packs has fields to support
echo cancellation: Echo Cancellation, EC Direction, and EC Configuration. The Echo
Cancellation field appears when the Echo Cancellation feature is activated on the
System-Parameters Customer Options screen. The EC Direction and EC Configuration fields
appear when the DS1 Echo Cancellation field is enabled.
EC Direction determines the direction from which echo will be eliminated, ether inward or
outward.
EC Configuration is the set of parameters used when cancelling echo. This information is
stored in firmware on the UDS1 circuit pack.
Echo cancellation is turned on or off on a per trunk-group basis using change trunk-group.
If the TRUNK GROUP field, DS1 Echo Cancellation is y, echo cancellation is applied to every
TN464GP/TN2464BP 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 Circuit Pack screen 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 Trunk Group screen. However, the modified setting does
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
Echo cancellation on the TN464GP/TN2464BP is selectable per channel, even though it is
administrable on a per trunk-group basis. For example, if all but two ports on a TN464GP/
TN2464BP need to have echo cancellation applied, those two ports must be put in a trunk
group where the DS1 Echo Cancellation field is n. The remaining ports are in a trunk group(s)
where the DS1 Echo Cancellation field is y. A user can cancel echo coming from the network
(far-end echo) or coming from the switch (near-end echo).