ECHO CANCELLER: Echo Canceller is Used on the PSTN side of the - TopicsExpress

ECHO CANCELLER: Echo Canceller is Used on the PSTN side of the MSC for all voice circuits. Echo control is required at the switch because the GSM inherent system delay can cause an unacceptable echo condition even on short distance PSTN circuit connections.The total round trip delay introduced by the GSM system (the cumulative delay caused by call processing, speech encoding and decoding, etc) is approximately 180 mS. The standard EC will provide cancellation of up to 68 milliseconds on the “tail circuit” (the tail circuit is the connection between the output of the EC and the land telephone).

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