Avaya 03-300430 User Manual

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:

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).